# Avionics

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Electronic systems used on aircraft

Radar and other avionics in the nose of a [Cessna Citation I/SP](/source/Cessna_Citation_I)

[F-105 Thunderchief](/source/Republic_F-105_Thunderchief) with avionics laid out

**Avionics** (a [portmanteau](/source/Portmanteau) of *aviation* and *electronics*) are the [electronic](/source/Electronics) systems used on [aircraft](/source/Aircraft). Avionic systems include communications, [navigation](/source/Air_navigation), the display and management of multiple systems, and the hundreds of systems that are fitted to aircraft to perform individual functions. These can be as simple as a [searchlight](/source/Searchlight) for a [police helicopter](/source/Police_helicopter) or as complicated as the tactical system for an [airborne early warning](/source/Airborne_early_warning) platform.[1]

## History

The term "avionics" was coined in 1949 by [Philip J. Klass](/source/Philip_J._Klass), senior editor at *[Aviation Week & Space Technology](/source/Aviation_Week_%26_Space_Technology)* magazine as a [portmanteau](/source/Portmanteau) of "**aviation electronics**".[2][3]

[Radio communication](/source/Radio_communication) was first used in aircraft just prior to [World War I](/source/World_War_I).[4] The first [airborne](/source/Airborne_radio_relay) radios were in [zeppelins](/source/Zeppelin), but the military sparked development of light radio sets that could be carried by heavier-than-air craft, so that [aerial reconnaissance](/source/Aerial_reconnaissance) biplanes could report their observations immediately in case they were shot down. The first experimental radio transmission from an airplane was conducted by the [U.S. Navy](/source/United_States_Navy) in August 1910. The first aircraft radios transmitted by [radiotelegraphy](/source/Radiotelegraphy). They required a two-seat aircraft with a second crewman who operated a [telegraph key](/source/Telegraph_key) to spell out messages in [Morse code](/source/Morse_code). During World War I, [amplitude modulation](/source/Amplitude_modulation) voice [two way radio](/source/Two_way_radio) sets were made possible in 1917 (see [TM (triode)](/source/TM_(triode))) by the development of the [triode](/source/Triode) [vacuum tube](/source/Vacuum_tube), which were simple enough that the pilot in a single seat aircraft could use it while flying.

[Radar](/source/Radar), the central technology used today in aircraft navigation and [air traffic control](/source/Air_traffic_control), was developed by several nations, mainly in secret, as an [air defense](/source/Air_defense) system in the 1930s during the runup to [World War II](/source/World_War_II). Many modern avionics have their origins in World War II wartime developments. For example, [autopilot](/source/Autopilot) systems that are commonplace today began as specialized systems to help bomber planes fly steadily enough to hit precision targets from high altitudes.[5] Britain's 1940 decision to share its radar technology with its U.S. ally, particularly the [magnetron](/source/Magnetron) [vacuum tube](/source/Vacuum_tube), in the famous [Tizard Mission](/source/Tizard_Mission), significantly shortened the war.[6] Modern avionics is a substantial portion of military aircraft spending. Aircraft like the [F-15E](/source/McDonnell_Douglas_F-15E_Strike_Eagle) and the now retired [F-14](/source/Grumman_F-14_Tomcat) have roughly 20 percent of their budget spent on avionics. Most modern [helicopters](/source/Helicopter) now have budget splits of 60/40 in favour of avionics.[7]

The civilian market has also seen a growth in cost of avionics. Flight control systems ([fly-by-wire](/source/Fly-by-wire)) and new navigation needs brought on by tighter airspaces, have pushed up development costs. The major change has been the recent boom in consumer flying. As more people begin to use planes as their primary method of transportation, more elaborate methods of controlling aircraft safely in these high restrictive airspaces have been invented.[*[citation needed](https://en.wikipedia.org/wiki/Wikipedia:Citation_needed)*]

### Modern avionics

Avionics plays a heavy role in modernization initiatives like the [Federal Aviation Administration](/source/Federal_Aviation_Administration)'s (FAA) [Next Generation Air Transportation System](/source/Next_Generation_Air_Transportation_System) project in the United States and the [Single European Sky ATM Research](/source/Single_European_Sky_ATM_Research) (SESAR) initiative in Europe. The [Joint Planning and Development Office](/source/Joint_Planning_and_Development_Office) put forth a roadmap for avionics in six areas:[8]

- Published Routes and Procedures – Improved navigation and routing

- Negotiated Trajectories – Adding data communications to create preferred routes dynamically

- Delegated Separation – Enhanced situational awareness in the air and on the ground

- LowVisibility/CeilingApproach/Departure – Allowing operations with weather constraints with less ground infrastructure

- Surface Operations – To increase safety in approach and departure

- ATM Efficiencies – Improving the [air traffic management](/source/Air_traffic_management) (ATM) process

### Market

The [Aircraft Electronics Association](https://en.wikipedia.org/w/index.php?title=Aircraft_Electronics_Association&action=edit&redlink=1) reports $1.73 billion avionics sales for the first three quarters of 2017 in [business](/source/Business_aviation) and [general aviation](/source/General_aviation), a 4.1% yearly improvement: 73.5% came from North America, forward-fit represented 42.3% while 57.7% were [retrofits](/source/Retrofit) as the U.S. deadline of January 1, 2020 for mandatory [ADS-B](/source/ADS-B) out approach.[9]

## Aircraft avionics

The cockpit or, in larger aircraft, under the cockpit of an aircraft or in a movable nosecone, is a typical location for [avionic bay](/source/Avionics_bay) equipment, including control, monitoring, communication, navigation, weather, and anti-collision systems. The majority of aircraft power their avionics using 14- or 28‑volt [DC](/source/Direct_current) electrical systems; however, larger, more sophisticated aircraft (such as [airliners](/source/Airliner) or military combat aircraft) have [AC](/source/Alternating_current) systems operating at 115 volts 400 Hz, AC.[10] There are several major vendors of flight avionics, including [The Boeing Company](/source/The_Boeing_Company), [Panasonic Avionics Corporation](/source/Panasonic_Avionics_Corporation), [Honeywell](/source/Honeywell_Aerospace) (which now owns [Bendix/King](/source/Bendix_Aviation)), [Universal Avionics Systems Corporation](/source/Universal_Avionics_Systems_Corporation), [Rockwell Collins](/source/Rockwell_Collins) (now Collins Aerospace), [Thales Group](/source/Thales_Group), [GE Aviation Systems](/source/GE_Aviation_Systems), [Garmin](/source/Garmin), [Raytheon](/source/Raytheon), [Parker Hannifin](/source/Parker_Hannifin), [UTC Aerospace Systems](/source/UTC_Aerospace_Systems) (now [Collins Aerospace](/source/Collins_Aerospace)), [Selex ES](/source/Selex_ES) (now [Leonardo](/source/Leonardo_(company))), Shadin Avionics, [Avidyne Corporation](/source/Avidyne_Corporation) and [Israel Aerospace Industries](/source/Israel_Aerospace_Industries).

International standards for avionics equipment are prepared by the Airlines Electronic Engineering Committee and published by [ARINC](/source/ARINC#Standards).

### Avionics Installation

Avionics installation is a critical aspect of modern aviation, ensuring that aircraft are equipped with the necessary electronic systems for safe and efficient operation. These systems encompass a wide range of functions, including communication, navigation, monitoring, flight control, and weather detection. Avionics installations are performed on all types of aircraft, from small general aviation planes to large commercial jets and military aircraft.

#### Installation Process

The installation of avionics requires a combination of technical expertise, precision, and adherence to stringent regulatory standards. The process typically involves:

1. **Planning and Design**: Before installation, the avionics shop works closely with the aircraft owner to determine the required systems based on the aircraft type, intended use, and regulatory requirements. Custom instrument panels are often designed to accommodate the new systems.

1. **Wiring and Integration**: Avionics systems are integrated into the aircraft's electrical and control systems, with wiring often requiring laser marking for durability and identification. Shops use detailed schematics to ensure correct installation.

1. **Testing and Calibration**: After installation, each system must be thoroughly tested and calibrated to ensure proper function. This includes ground testing, flight testing, and system alignment with regulatory standards such as those set by the FAA.

1. **Certification**: Once the systems are installed and tested, the avionics shop completes the necessary certifications. In the U.S., this often involves compliance with FAA Part 91.411 and 91.413 for IFR (Instrument Flight Rules) operations, as well as RVSM (Reduced Vertical Separation Minimum) certification.

#### Regulatory Standards

Avionics installation is governed by strict regulatory frameworks to ensure the safety and reliability of aircraft systems. In the United States, the Federal Aviation Administration (FAA) sets the standards for avionics installations. These include guidelines for:

- **System Performance**: Avionics systems must meet performance benchmarks as defined by the FAA, ensuring they function correctly in all phases of flight.

- **Certification**: Shops performing installations must be FAA-certified, and their technicians often hold certifications such as the General Radiotelephone Operator License (GROL).

- **Inspections**: Aircraft equipped with newly installed avionics systems must undergo rigorous inspections before being cleared for flight, including both ground and flight tests.

#### Advancements in Avionics Technology

The field of avionics has seen rapid technological advancements in recent years, leading to more integrated and automated systems. Key trends include:

- **Glass Cockpits**: Traditional analog gauges are being replaced by fully integrated glass cockpit displays, providing pilots with a centralized view of all flight parameters.

- **NextGen Technologies**: ADS-B and satellite-based navigation are part of the FAA's NextGen initiative, aimed at modernizing air traffic control and improving the efficiency of the national airspace.

- **Autonomous Systems**: Advanced automation systems are paving the way for more autonomous aircraft systems, enhancing safety, efficiency, and reducing pilot workload.

### Communications

Communications connect the flight deck to the ground and the flight deck to the passengers. On‑board communications are provided by public-address systems and aircraft intercoms.

The VHF aviation communication system works on the [airband](/source/Airband) of 118.000 MHz to 136.975 MHz. Each channel is spaced from the adjacent ones by 8.33 kHz in Europe, 25 kHz elsewhere. VHF is also used for line of sight communication such as aircraft-to-aircraft and aircraft-to-ATC. [Amplitude modulation](/source/Amplitude_modulation) is used, and the conversation is performed in [simplex](/source/Simplex_communication) mode. Aircraft communication can also take place using HF (especially for trans-oceanic flights) or satellite communication.

See also: [Aircraft Communication Addressing and Reporting System](/source/Aircraft_Communication_Addressing_and_Reporting_System)

### Navigation

Main article: [Air navigation](/source/Air_navigation)

[Air navigation](/source/Air_navigation) is the determination of position and direction on or above the surface of the Earth. Avionics can use [satellite navigation](/source/Satellite_navigation) systems (such as [GPS](/source/GPS), [WAAS](/source/WAAS), [EGNOS](/source/European_Geostationary_Navigation_Overlay_Service) and [GBAS/LAAS](/source/Local-area_augmentation_system)), [inertial navigation system](/source/Inertial_navigation_system) (INS), ground-based [radio navigation](/source/Radio_navigation) systems (such as [VOR](/source/VHF_omnidirectional_range) or [LORAN](/source/LORAN)), or any combination thereof. Some navigation systems such as GPS calculate the position automatically and display it to the flight crew on moving map displays. Older ground-based Navigation systems such as VOR or LORAN requires a pilot or navigator to plot the intersection of signals on a paper map to determine an aircraft's location; modern systems calculate the position automatically and display it to the flight crew on moving map displays.

### Monitoring

Main article: [Glass cockpit](/source/Glass_cockpit)

The [Airbus A380](/source/Airbus_A380) glass cockpit featuring pull-out keyboards and two wide computer screens on the sides for pilots

The first hints of [glass cockpits](/source/Glass_cockpit) emerged in the 1970s when flight-worthy [cathode ray tube](/source/Cathode_ray_tube) (CRT) screens began to replace electromechanical displays, gauges and instruments. A "glass" cockpit refers to the use of computer monitors instead of gauges and other analog displays. Aircraft were getting progressively more displays, dials and information dashboards that eventually competed for space and pilot attention. In the 1970s, the average aircraft had more than 100 cockpit instruments and controls.[11] Glass cockpits started to come into being with the [Gulfstream](/source/Gulfstream_Aerospace) G‑IV private jet in 1985. One of the key challenges in glass cockpits is to balance how much control is automated and how much the pilot should do manually. Generally they try to automate flight operations while keeping the pilot constantly informed.[11]

### Aircraft flight-control system

Main article: [Aircraft flight control system](/source/Aircraft_flight_control_system)

Aircraft have means of automatically controlling flight. [Autopilot](/source/Autopilot) was first invented by [Lawrence Sperry](/source/Lawrence_Sperry) during [World War I](/source/World_War_I) to fly bomber planes steady enough to hit accurate targets from 25,000 feet. When it was first adopted by the [U.S. military](/source/U.S._military), a [Honeywell](/source/Honeywell_Aerospace) engineer sat in the back seat with bolt cutters to disconnect the autopilot in case of emergency. Nowadays most commercial planes are equipped with aircraft flight control systems in order to reduce pilot error and workload at landing or takeoff.[5]

The first simple commercial auto-pilots were used to control [heading](/source/Aircraft_heading) and altitude and had limited authority on things like [thrust](/source/Thrust) and [flight control](/source/Flight_control_surfaces) surfaces. In [helicopters](/source/Helicopter), auto-stabilization was used in a similar way. The first systems were electromechanical. The advent of [fly-by-wire](/source/Fly-by-wire) and electro-actuated flight surfaces (rather than the traditional hydraulic) has increased safety. As with displays and instruments, critical devices that were electro-mechanical had a finite life. With safety critical systems, the software is very strictly tested.

### Fuel Systems

Fuel Quantity Indication System (FQIS) monitors the amount of fuel aboard. Using various sensors, such as capacitance tubes, temperature sensors, densitometers & level sensors, the FQIS computer calculates the mass of fuel remaining on board.

Fuel Control and Monitoring System (FCMS) reports fuel remaining on board in a similar manner, but, by controlling pumps & valves, also manages fuel transfers around various tanks.

- Refuelling control to upload to a certain total mass of fuel and distribute it automatically.

- Transfers during flight to the tanks that feed the engines. E.G. from fuselage to wing tanks

- Centre of gravity control transfers from the tail (trim) tanks forward to the wings as fuel is expended

- Maintaining fuel in the wing tips (to alleviate wing bending due to lift in flight) & transferring to the main tanks after landing

- Controlling fuel jettison during an emergency to reduce the aircraft weight.

### Collision-avoidance systems

Main article: [Aircraft collision avoidance systems](/source/Aircraft_collision_avoidance_systems)

To supplement [air traffic control](/source/Air_traffic_control), most large transport aircraft and many smaller ones use a [traffic alert and collision avoidance system](/source/TCAS) (TCAS), which can detect the location of nearby aircraft, and provide instructions for avoiding a midair collision. Smaller aircraft may use simpler traffic alerting systems such as TPAS, which are passive (they do not actively interrogate the [transponders](/source/Transponder) of other aircraft) and do not provide advisories for conflict resolution.

To help avoid controlled flight into terrain ([CFIT](/source/CFIT)), aircraft use systems such as [ground-proximity warning systems](/source/GPWS) (GPWS), which use radar altimeters as a key element. One of the major weaknesses of GPWS is the lack of "look-ahead" information, because it only provides altitude above terrain "look-down". In order to overcome this weakness, modern aircraft use a terrain awareness warning system ([TAWS](/source/TAWS)).

### Flight recorders

Main article: [Flight recorder](/source/Flight_recorder)

Commercial aircraft cockpit data recorders, commonly known as "black boxes", store flight information and audio from the [cockpit](/source/Cockpit). They are often recovered from an aircraft after a crash to determine control settings and other parameters during the incident.

### Weather systems

Main articles: [Weather radar](/source/Weather_radar) and [Lightning detector](/source/Lightning_detector)

Weather systems such as [weather radar](/source/Weather_radar) (typically [Arinc 708](/source/Arinc_708) on commercial aircraft) and [lightning detectors](/source/Lightning_detector) are important for aircraft flying at night or in [instrument meteorological conditions](/source/Instrument_meteorological_conditions), where it is not possible for pilots to see the weather ahead. Heavy precipitation (as sensed by radar) or severe [turbulence](/source/Clear-air_turbulence) (as sensed by lightning activity) are both indications of strong convective activity and severe turbulence, and weather systems allow pilots to deviate around these areas.

Lightning detectors like the Stormscope or Strikefinder have become inexpensive enough that they are practical for light aircraft. In addition to radar and lightning detection, observations and extended radar pictures (such as [NEXRAD](/source/NEXRAD)) are now available through satellite data connections, allowing pilots to see weather conditions far beyond the range of their own in-flight systems. Modern displays allow weather information to be integrated with moving maps, terrain, and traffic onto a single screen, greatly simplifying navigation.

Modern weather systems also include [wind shear](/source/Wind_shear) and turbulence detection and terrain and traffic warning systems.[12] In‑plane weather avionics are especially popular in [Africa](/source/Africa), [India](/source/India), and other countries where air-travel is a growing market, but ground support is not as well developed.[13]

### Aircraft management systems

There has been a progression towards centralized control of the multiple complex systems fitted to aircraft, including engine monitoring and management. [Health and usage monitoring systems](/source/Health_and_usage_monitoring_systems) (HUMS) are integrated with aircraft management computers to give maintainers early warnings of parts that will need replacement.

The [integrated modular avionics](/source/Integrated_modular_avionics) concept proposes an integrated architecture with application software portable across an assembly of common hardware modules. It has been used in [fourth generation jet fighters](/source/Fourth_generation_jet_fighter) and the latest generation of [airliners](/source/Airliner).

## Mission or tactical avionics

[Military aircraft](/source/Military_aircraft) have been designed either to deliver a weapon or to be the eyes and ears of other weapon systems. The vast array of sensors available to the military is used for whatever tactical means required. As with aircraft management, the bigger sensor platforms (like the E‑3D, JSTARS, ASTOR, Nimrod MRA4, Merlin HM Mk 1) have mission-management computers.

Police and EMS aircraft also carry sophisticated tactical sensors.

### Military communications

While aircraft communications provide the backbone for safe flight, the tactical systems are designed to withstand the rigors of the battle field. [UHF](/source/Ultra_high_frequency), [VHF](/source/Very_high_frequency) Tactical (30–88 MHz) and SatCom systems combined with [ECCM](/source/Electronic_counter-countermeasures) methods, and [cryptography](/source/Cryptography) secure the communications. Data links such as [Link 11](/source/Link_11), [16](/source/Link_16), [22](/source/Link_22) and [BOWMAN](/source/Bowman_(communications_system)), [JTRS](/source/JTRS) and even [TETRA](/source/TETRA) provide the means of transmitting data (such as images, targeting information etc.).

### Radar

Airborne [radar](/source/Radar) was one of the first tactical sensors. The benefit of altitude providing range has meant a significant focus on airborne radar technologies. Radars include [airborne early warning](/source/Airborne_early_warning), [anti-submarine warfare](/source/Anti-submarine_warfare), and even [weather radar](/source/Weather_radar) ([Arinc 708](/source/Arinc_708)) and ground tracking/proximity radar.

The military uses [radar in fast jets to help pilots fly at low levels](/source/Terrain-following_radar). While the civil market has had weather radar for a while,[14] there are strict rules about using it to navigate the aircraft.[15]

### Sonar

Dipping sonar fitted to a range of military helicopters allows the [helicopter](/source/Helicopter) to protect shipping assets from submarines or surface threats. Maritime support aircraft can drop active and passive sonar devices ([sonobuoys](/source/Sonobuoy)) and these are also used to determine the location of enemy submarines.

### Electro-optics

Electro-optic systems include devices such as the [head-up display](/source/Head-up_display) (HUD), [forward looking infrared](/source/Forward_looking_infrared) (FLIR), [infrared search and track](/source/Infrared_search_and_track) and other passive infrared devices ([Passive infrared sensor](/source/Passive_infrared_sensor)). These are all used to provide imagery and information to the flight crew. This imagery is used for everything from search and rescue to [navigational aids](/source/Navigational_aid) and [target acquisition](/source/Target_acquisition).

### ESM/DAS

Electronic support measures and defensive aids systems are used extensively to gather information about threats or possible threats. They can be used to launch devices (in some cases automatically) to counter direct threats against the aircraft. They are also used to determine the state of a threat and identify it.

### Aircraft networks

The avionics systems in military, commercial and advanced models of civilian aircraft are interconnected using an avionics databus. Common avionics databus protocols, with their primary application, include:

- [Aircraft Data Network](/source/Aircraft_Data_Network) ([ADN](/source/Aircraft_Data_Network)): Ethernet derivative for Commercial Aircraft

- [Avionics Full-Duplex Switched Ethernet](/source/Avionics_Full-Duplex_Switched_Ethernet): Specific implementation of ARINC 664 ([ADN](/source/Aircraft_Data_Network)) for Commercial Aircraft

- [ARINC 429](/source/ARINC_429): Generic Medium-Speed Data Sharing for Private and Commercial Aircraft

- [ARINC 664](/source/Avionics_Full-Duplex_Switched_Ethernet): See ADN above

- [ARINC 629](/source/ARINC_629): Commercial Aircraft ([Boeing 777](/source/Boeing_777))

- [ARINC 708](/source/ARINC_708): Weather Radar for Commercial Aircraft

- [ARINC 717](/source/ARINC_717): Flight Data Recorder for Commercial Aircraft

- [ARINC 825](https://en.wikipedia.org/w/index.php?title=ARINC_825&action=edit&redlink=1): [CAN bus](/source/CAN_bus) for commercial aircraft (for example [Boeing 787](/source/Boeing_787) and [Airbus A350](/source/Airbus_A350))

- [Commercial Standard Digital Bus](/source/Commercial_Standard_Digital_Bus)

- [IEEE 1394b](/source/IEEE_1394b#Military_Aircraft): Military Aircraft

- [MIL-STD-1553](/source/MIL-STD-1553): Military Aircraft

- [MIL-STD-1760](/source/MIL-STD-1760): Military Aircraft

- [TTP](/source/Time-Triggered_Protocol) – Time-Triggered Protocol: [Boeing 787](/source/Boeing_787), [Airbus A380](/source/Airbus_A380), Fly-By-Wire Actuation Platforms from Parker Aerospace

## Spacecraft Avionics

Often derived from aeronautical systems, spacecraft avionics perform core functions—such as flight control, communication, and navigation—that mirror those of traditional aircraft. This heritage is most evident in the "[glass cockpit](/source/Glass_cockpit)" architecture originally developed for aviation, which served as the operational baseline for the [Space Shuttle](/source/Space_Shuttle) and paved the way for the diverse control interfaces found in modern vehicles like [Orion](/source/Orion_(spacecraft))[16][17][18], [Dragon](/source/SpaceX_Dragon_2)[19], and [Starliner.](/source/Boeing_Starliner)[20] Beyond flight dynamics, space-grade avionics are uniquely responsible for managing the [Environmental Control and Life Support System](/source/Life-support_system) (ECLSS) critical to crew survival, reflecting a broader industry definition where the term encompasses all aerospace integrated electronics across launch vehicles,[21][22] satellites, and other space systems.[23][24][25]

Spacecraft avionics face a unique set of environmental challenges. First and foremost is the space radiation environment.[26] Radiation, primarily from solar events (such as [solar flares](/source/Solar_flare) and [coronal mass ejections](/source/Coronal_mass_ejection)) and [galactic cosmic rays](/source/Galactic_cosmic_rays), can cause both transient and permanent failures in electronics.[27] Consequently, [radiation hardening](/source/Radiation_hardening) is essential to mitigate these effects.

Thermal management also differs significantly from Earth-based applications; in the vacuum of space, the absence of air prevents convection cooling. As a result, space avionics are typically conduction-cooled.[28] Furthermore, these systems must remain operational at temperatures that often fall well outside standard commercial, industrial, or even military [operating range](/source/Operating_temperature). Finally, space avionics must be ruggedized to survive the intense shock and vibration experienced during the launch environment.[29]

## Modern integration and digital flight decks

Avionics have evolved from analog instruments to fully integrated digital flight decks that combine multiple systems into a single interface. Modern avionics suites include flight management systems (FMS), synthetic vision, datalink communications, performance-based navigation (PBN) capability, and advanced terrain and traffic avoidance tools. Glass cockpits now support LPV and RNP AR approaches, improved situational awareness, and enhanced safety in challenging environments, including low-visibility helicopter operations. These advancements are driven by satellite navigation systems such as WAAS and GBAS, which enable precise lateral and vertical guidance.[30][31]

## See also

- [Astrionics](/source/Astrionics), similar, for spacecraft

- [ACARS](/source/ACARS) – Aircraft digital message communication system

- [Acronyms and abbreviations in avionics](/source/Acronyms_and_abbreviations_in_avionics)

- [ARINC](/source/ARINC) – American company (1929–2018)

- [Avionics software](/source/Avionics_software)

- [DO-178C](/source/DO-178C) – International aeronautics software standard

- [Emergency locator beacon](/source/Emergency_locator_beacon)

- [Emergency position-indicating radiobeacon](/source/Emergency_position-indicating_radiobeacon)

- [Flight recorder](/source/Flight_recorder) – Robust aircraft electronic recording device

- [Integrated modular avionics](/source/Integrated_modular_avionics)

## Notes

1. **[^](#cite_ref-1)** Wragg, David W. (1973). *A Dictionary of Aviation* (first ed.). Osprey. p. 47. [ISBN](/source/ISBN_(identifier)) [9780850451634](https://en.wikipedia.org/wiki/Special:BookSources/9780850451634).

1. **[^](#cite_ref-2)** McGough, Michael (August 26, 2005). ["In Memoriam: Philip J. Klass: A UFO (Ufologist Friend's Obituary)"](http://www.skeptic.com/eskeptic/05-08-26/). Skeptic. [Archived](https://web.archive.org/web/20150922191504/http://www.skeptic.com/eskeptic/05-08-26/) from the original on September 22, 2015. Retrieved April 26, 2012.

1. **[^](#cite_ref-Dickson_3-0)** Dickson, Paul (2009). [*A Dictionary of the Space Age*](https://books.google.com/books?id=afKBvKlg0-EC&q=avionics&pg=PA32). JHU Press. p. 32. [ISBN](/source/ISBN_(identifier)) [9780801895043](https://en.wikipedia.org/wiki/Special:BookSources/9780801895043). [Archived](https://web.archive.org/web/20211001040428/https://www.google.com/books/edition/A_Dictionary_of_the_Space_Age/afKBvKlg0-EC?hl=en&gbpv=1&bsq=avionics&pg=PA32&printsec=frontcover) from the original on October 1, 2021. Retrieved November 24, 2020.

1. **[^](#cite_ref-Telephony_4-0)** ["Directing Airplanes by Wireless"](https://books.google.com/books?id=0Iw_AQAAMAAJ&q=aircraft+radio+wireless&pg=RA6-PA20). *Telephony*. **77** (8). Chicago, IL: Telephony Publishing Corp.: 20 August 23, 1919. [Archived](https://web.archive.org/web/20211001040425/https://books.google.com/books?id=0Iw_AQAAMAAJ&q=aircraft+radio+wireless&pg=RA6-PA20) from the original on October 1, 2021. Retrieved November 24, 2020.

1. ^ [***a***](#cite_ref-two_5-0) [***b***](#cite_ref-two_5-1) By Jeffrey L. Rodengen. [ISBN](/source/ISBN_(identifier)) [0-945903-25-1](https://en.wikipedia.org/wiki/Special:BookSources/0-945903-25-1). Published by Write Stuff Syndicate, Inc. in 1995. "The Legend of Honeywell."

1. **[^](#cite_ref-6)** [Reginald Victor Jones](/source/Reginald_Victor_Jones) (1998). *Most Secret War*. Wordsworth Editions. [ISBN](/source/ISBN_(identifier)) [978-1-85326-699-7](https://en.wikipedia.org/wiki/Special:BookSources/978-1-85326-699-7).

1. **[^](#cite_ref-7)** Douglas Nelms (April 1, 2006). ["Rotor & Wing: Retro Cockpits"](https://www.rotorandwing.com/2006/04/01/retro-cockpits/). [Archived](https://web.archive.org/web/20190417203525/https://www.rotorandwing.com/2006/04/01/retro-cockpits/) from the original on April 17, 2019. Retrieved April 17, 2019.

1. **[^](#cite_ref-8)** ["NextGen Avionics Roadmap"](https://web.archive.org/web/20120417025034/http://www.jpdo.gov/library/20111005_ARM_complete_LowRes_v2.0.pdf) (PDF). Joint Planning and Development Office. September 30, 2011. Archived from [the original](http://www.jpdo.gov/library/20111005_ARM_complete_LowRes_v2.0.pdf) (PDF) on April 17, 2012. Retrieved January 25, 2012.

1. **[^](#cite_ref-9)** Chad Trautvetter (November 20, 2017). ["AEA: Retrofits Lift Avionics Sales through 3Q"](https://www.ainonline.com/aviation-news/business-aviation/2017-11-20/aea-retrofits-lift-avionics-sales-through-3q). *AIN*. [Archived](https://web.archive.org/web/20171201040625/https://www.ainonline.com/aviation-news/business-aviation/2017-11-20/aea-retrofits-lift-avionics-sales-through-3q) from the original on December 1, 2017. Retrieved November 21, 2017.

1. **[^](#cite_ref-10)** ["400 Hz Electrical Systems"](http://www.aerospaceweb.org/question/electronics/q0219.shtml). [Archived](https://web.archive.org/web/20181004205311/http://www.aerospaceweb.org/question/electronics/q0219.shtml) from the original on October 4, 2018. Retrieved March 19, 2008.

1. ^ [***a***](#cite_ref-three_11-0) [***b***](#cite_ref-three_11-1) *Avionics: Development and Implementation* by Cary R. Spitzer (Hardcover – December 15, 2006)

1. **[^](#cite_ref-four_12-0)** Ramsey, James (August 1, 2000). ["Broadening Weather Radar's Scope"](http://www.aviationtoday.com/av/commercial/Broadening-Weather-Radars-Scope_12786.html). Aviation Today. [Archived](https://web.archive.org/web/20130118175850/http://www.aviationtoday.com/av/commercial/Broadening-Weather-Radars-Scope_12786.html) from the original on January 18, 2013. Retrieved January 25, 2012.

1. **[^](#cite_ref-13)** Fitzsimons, Bernard (November 13, 2011). ["Honeywell Looks East While Innovating For Safe Growth"](http://www.ainonline.com/?q=aviation-news/dubai-air-show/2011-11-13/honeywell-looks-east-while-innovating-safe-growth). Aviation International News. [Archived](https://web.archive.org/web/20111116164353/http://www.ainonline.com/?q=aviation-news%2Fdubai-air-show%2F2011-11-13%2Fhoneywell-looks-east-while-innovating-safe-growth) from the original on November 16, 2011. Retrieved December 27, 2011.

1. **[^](#cite_ref-14)** [Woodford, Chris](/source/Chris_Woodford_(author)) (August 7, 2007). ["How radar works | Uses of radar"](http://www.explainthatstuff.com/radar.html). *Explain that Stuff*. Retrieved June 24, 2022.

1. **[^](#cite_ref-15)** ["14 CFR § 121.357 - Airborne weather radar equipment requirements"](https://www.law.cornell.edu/cfr/text/14/121.357). *Legal Information Institute*. Retrieved October 20, 2022.

1. **[^](#cite_ref-16)** Coppinger, Rob (October 6, 2006). ["NASA Orion crew vehicle will use voice controls in Boeing 787-style Honeywell smart cockpit"](https://www.flightglobal.com/space/2006/10/nasa-orion-crew-vehicle-will-use-voice-controls-in-boeing-787-style-honeywell-smart-cockpit/). *www.flightglobal.com*.

1. **[^](#cite_ref-17)** ["Inside Orion"](https://www.nasa.gov/gallery/inside-orion/). *www.nasa.gov*. November 8, 2023.

1. **[^](#cite_ref-18)** Baggerman, Clint (August 2, 2013). ["Avionics System Architecture for NASA Orion Vehicle"](https://ntrs.nasa.gov/citations/20100040584). *ntrs.nasa.gov*.

1. **[^](#cite_ref-19)** Brumfiel, Geoff (May 30, 2014). ["SpaceX Unveils A Sleek New Ride To Orbit"](https://www.publicradiotulsa.org/topics/2014-05-30/spacex-unveils-a-sleek-new-ride-to-orbit). *www.publicradiotulsa.org*.

1. **[^](#cite_ref-20)** Tangermann, Victor (June 11, 2020). ["Boeing's Spaceship Cockpit Looks Strikingly Different Than SpaceX's"](https://futurism.com/boeings-spaceship-cockpit-looks-strikingly-different-spacexs). *futurism.com*.

1. **[^](#cite_ref-21)** ["SLS (Space Launch System) Avionics: The "Brains" of SLS"](https://www.nasa.gov/reference/sls-avionics/). *www.nasa.gov*. MSFS-12-2025-SLS-5634. December 12, 2024.

1. **[^](#cite_ref-22)** Marchant, Christopher (November 10, 2009). ["Ares I Avionics Introduction"](https://ntrs.nasa.gov/citations/20100011081). *ntrs.nasa.gov*.

1. **[^](#cite_ref-23)** Hodson, Robert (October 30, 2024). ["Key Considerations When Developing Avionics for Safety-Critical Systems"](https://ntrs.nasa.gov/citations/20240013463). *ntrs.nasa.gov*.

1. **[^](#cite_ref-24)** Green, Christopher; Haghani, Noosha (July 21, 2023). ["MUSTANG: A Workhorse for NASA Spaceflight Avionics"](https://ntrs.nasa.gov/citations/20230003757). *ntrs.nasa.gov*.

1. **[^](#cite_ref-25)** ["Small Spacecraft Avionics"](https://www.nasa.gov/wp-content/uploads/2025/02/8-soa-small-spacecraft-avionics-2024.pdf?emrc=69ce633dbf767) (PDF). *www.nasa.gov*. March 5, 2025.

1. **[^](#cite_ref-26)** ["Why Space Radiation Matters"](https://www.nasa.gov/missions/analog-field-testing/why-space-radiation-matters/). *www.nasa.gov*. Retrieved April 6, 2026.

1. **[^](#cite_ref-27)** Hodson, Robert; Pellish, Jonathan (July 1, 2021). ["Avionics Radiation Hardness Assurance (RHA) Guidelines"](https://ntrs.nasa.gov/citations/20210018053). *ntrs.nasa.gov*. p. 55.

1. **[^](#cite_ref-28)** ["3U Rugged Conduction-Cooled Enclosure"](https://www.mobilityengineeringtech.com/component/content/article/11493-3u-rugged-conduction-cooled-enclosure). *www.mobilityengineeringtech.com*. June 1, 2011.

1. **[^](#cite_ref-29)** Himelblau, Harry; Kern, Dennis; Piersol, Allan; Manning, Jerome; Rubin, Sheldon (December 4, 2000). ["NASA-HDBK-7005 Dynamic Environmental Criteria"](https://everyspec.com/NASA/NASA-NASA-HDBK/download.php?spec=NASA-HDBK-7005_2000.039105.pdf) (PDF). *everyspec.com*.

1. **[^](#cite_ref-30)** ["Airliner-Style PBN for Helicopters"](https://interactive.aviationtoday.com/avionicsmagazine/february-2019/airliner-style-pbn-for-helicopters/). *Avionics Magazine*. February 2019. Retrieved October 6, 2025.

1. **[^](#cite_ref-31)** ["Hughes Aerospace PBN Executive Summary"](https://www.faasafety.gov/files/events/GL/GL15/2024/GL15127506/Hughes_Aerospace_PBN_Executive_Summary.pdf) (PDF). *FAASafety.gov*. January 2024. Retrieved October 6, 2025.

## Further reading

- *Avionics: Development and Implementation* by Cary R. Spitzer (Hardcover – December 15, 2006)

- *Principles of Avionics*, 4th Edition by Albert Helfrick, Len Buckwalter, and Avionics Communications Inc. (Paperback – July 1, 2007)

- *Avionics Training: Systems, Installation, and Troubleshooting* by Len Buckwalter (Paperback – June 30, 2005)

- *Avionics Made Simple*, by Mouhamed Abdulla, Ph.D.; Jaroslav V. Svoboda, Ph.D. and Luis Rodrigues, Ph.D. (Coursepack – Dec. 2005 - [ISBN](/source/ISBN_(identifier)) [978-0-88947-908-1](https://en.wikipedia.org/wiki/Special:BookSources/978-0-88947-908-1)).

## External links

Wikimedia Commons has media related to [Avionics](https://commons.wikimedia.org/wiki/Category:Avionics).

Look up ***[avionics](https://en.wiktionary.org/wiki/avionics)*** in Wiktionary, the free dictionary.

- [Avionics in Commercial Aircraft](https://web.archive.org/web/20160510105632/http://www.harbourind.com/applications-in-commercial-aircraft)

- [Aircraft Electronics Association](http://www.aea.net)

- [*Pilot's Guide to Avionics*](http://www.aeapilotsguide.net)

- [The Avionic Systems Standardisation Committee](https://web.archive.org/web/20081020024422/http://www.assconline.co.uk/)

- [Space Shuttle Avionics](http://klabs.org/DEI/Processor/shuttle/sp-504/sp-504.htm)

- [Aviation Today Avionics magazine](https://web.archive.org/web/20070921205322/http://www.aviationtoday.com/av/)

- [RAES Avionics homepage](https://web.archive.org/web/20071230104039/http://www.raes.org.uk/cmspage.asp?cmsitemid=SG_Av_Sys_Home)

v t e Aircraft components and systems Airframe structure Aft pressure bulkhead Cabane strut Canopy Crack arrestor Cruciform tail Dope Empennage Fabric covering Fairing Flying wires Former Fuselage Hardpoint Interplane strut Jury strut Leading edge Lift strut Longeron Nacelle Rib Spar Stabilizer Stressed skin Strut T-tail Tailplane Trailing edge Triple tail Twin tail V-tail Vertical stabilizer Wing root Wing tip Wingbox Flight controls Aileron Airbrake Artificial feel Autopilot Canard Centre stick Deceleron Dive brake Dual control Electro-hydraulic actuator Elevator Elevon Flaperon Flight control modes Fly-by-wire Gust lock HOTAS Rudder Rudder pedals Servo tab Side-stick Spoiler Spoileron Stabilator Stick pusher Stick shaker Trim tab Wing warping Yaw damper Yoke Aerodynamic and high-lift devices Active Aeroelastic Wing Adaptive compliant wing Anti-shock body Blown flap Channel wing Dog-tooth Drag-reducing aerospike Flap Gouge flap Gurney flap Krueger flap Leading-edge cuff Leading-edge droop flap LEX Slats Slot Stall strips Strake Variable-sweep wing Vortex generator Vortilon Wing fence Winglet Avionic and flight instrument systems ACAS Air data boom Air data computer Aircraft periscope Airspeed indicator Altimeter Annunciator panel Astrodome Attitude indicator Compass Course deviation indicator EFIS EICAS Flight management system Glass cockpit GPS Head-up display Heading indicator Horizontal situation indicator INS ISIS Multi-function display Pitot–static system Radar altimeter TCAS Transponder Turn and slip indicator Variometer Yaw string Propulsion controls, devices and fuel systems Autothrottle Drop tank FADEC Fuel tank Gascolator Inlet cone Intake ramp NACA cowling NACA duct Self-sealing fuel tank Splitter plate Throttle Thrust lever Thrust reversal Townend ring War emergency power Wet wing Landing and arresting gear Aircraft tire Arrestor hook Autobrake Conventional landing gear Drogue parachute Landing gear Landing gear extender Oleo strut Tricycle landing gear Tundra tire Escape systems Ejection seat Escape crew capsule Other systems Aircraft lavatory Auxiliary power unit Bleed air system Deicing boot Emergency oxygen system Environmental control system Flight recorder Hydraulic system Ice protection system In-flight entertainment system Landing lights Navigation light Passenger service unit Ram air turbine

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Adapted from the Wikipedia article [Avionics](https://en.wikipedia.org/wiki/Avionics) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Avionics?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.