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autothrottle wikipedia jump to content main menu main menu move to sidebar hide navigation main page contents current events random article about wikipedia contact us contribute help learn to edit community portal recent changes upload file special pages search search appearance donate create account log in personal tools donate create account log in contents move to sidebar hide top 1 working modes 2 usage 3 history 4 see also 5 references 6 external links toggle the table of contents autothrottle 14 languages العربية čeština español فارسی français bahasa indonesia italiano 한국어 minangkabau polski русский slovenščina українська 中文 edit links article talk english read edit view history tools tools move to sidebar hide actions read edit view history general what links here related changes upload file permanent link page information cite this page get shortened url switch to legacy parser print export download as pdf printable version in other projects wikidata item appearance move to sidebar hide from wikipedia the free encyclopedia system that allows a pilot to control thrust without manually setting fuel flow for a similar system in cars see cruise control thrust levers of an a320 set to the autothrust position during cruise flight an autothrottle automatic throttle also known as autothrust a t or a thr is a system that allows a pilot to control the power setting of an aircraft s engines by specifying a desired flight characteristic rather than manually controlling the fuel flow the autothrottle can greatly reduce the pilots workload and help conserve fuel and extend engine life by metering the precise amount of fuel required to attain a specific target indicated air speed or the assigned power for different phases of flight a t and afds auto flight director systems can work together to fulfill the whole flight plan 1 working modes edit there are two parameters that an a t can maintain or try to attain speed and thrust citation needed in speed mode the throttle is positioned to attain a set target speed subject to safe operating margins for example if the pilot selects a target speed which is slower than stall speed the autothrottle system maintains a speed above the stall speed citation needed in the thrust mode the engine is maintained at a fixed power setting according to the different flight phases for example during takeoff the a t maintains constant takeoff power until takeoff mode is finished during climb the a t maintains constant climb power in descent the a t reduces the setting to the idle position and so on when the a t is working in thrust mode speed is controlled by pitch or the control column and not by the a t a radar altimeter feeds data to the autothrottle in this mode 1 2 usage edit on boeing type aircraft a t can be used in all flight phases from takeoff climb cruise descent approach all the way to land or go around barring malfunction taxi is not considered a part of flight and a t does not work for taxiing in most cases a t mode selection is automatic without the need of any manual selection unless interrupted by pilots citation needed according to boeing published flight procedures a t is engaged before the takeoff procedure and is automatically disconnected two seconds after landing during flight manual override of a t is always available a release of manual override allows a t to regain control and the throttle will go back to the a t commanded position except for two modes boeing type aircraft idle and thr hld in these two modes the throttle will remain at the manual commanded position 2 history edit a primitive autothrottle was first fitted to later versions of the messerschmitt me 262 jet fighter late in world war ii however the first commercial airplane with this system named autopower was the dc 3 since 1956 the first version was able to keep a constant angle of attack but speed only during approach when the possibility of maintaining speed during an entire flight was introduced it led to the creation of the modern autothrottle the ra 5c vigilante used an autothrottle actuated by the input from accelerometers installed in the tail which caused the throttle to be sensitive to movement of the stabilator this allowed the pilot to adjust the throttle setting during landing approach by stick input alone 3 4 5 shortly after autopower s success two companies sperry now part of honeywell and collins started competing in the development of an autothrottle with more and more liners and business jets being equipped with it citation needed today it is often linked to a flight management system fadec is an extension of the autothrottle concept and controls many other parameters besides fuel flow 1 see also edit thrust lever asiana airlines flight 214 crashed when the pilot changed the auto pilot setting that disengaged the auto throttle atlas air flight 3591 2019 crash of a boeing 767 freighter in which the pilot unknowingly switched the a t to go around mode in instrument meteorological conditions and suffered a head up somatogravic illusion tarom flight 371 crashed after an auto throttle failure and incapacitation of the captain sriwijaya air flight 182 crashed after an auto throttle failure references edit 1 2 3 pope stephen 29 april 2015 autothrottle advances flying retrieved 29 december 2022 1 2 b737 autothrottle a t normal and non normal operations september 2 2014 ra 5c vigilante overview www carrierbuilders net retrieved 2026 02 11 north american rockwell a3j a 5 vigilante by dennis r jenkins isbn 0 942548 14 0 first published sept 1989 56 pages airwingmedia com north american a 5 vigilante pdf ebook aircraft flight manuals retrieved 2026 02 11 external links edit us patent us3362661 booth george c post morris h prilliman floyd w redmond jr william g autothrottle issued 1968 1 9 v t e jet engines and aircraft gas turbines gas turbines and jet propulsion types air turborocket pulsejet valveless pulsejet gluhareff pressure jet pulse detonation engine propfan turbofan turbojet turboprop turboshaft ramjet scramjet shcramjet rocket rotating detonation engine mechanical components accessory drive air intake afterburner reheat axial compressor centrifugal compressor combustor constant speed drive impeller nose bullet propelling nozzle turbine blade principles aircraft engine starting bleed air brayton cycle bypass ratio compressor stall engine pressure ratio epr flameout jet engine performance overall pressure ratio propulsive efficiency specific impulse thrust thrust lapse thrust specific fuel consumption thrust to weight ratio variable cycle engine windmill restart propellers components propeller governor propeller speed reduction unit principles autofeather blade pitch constant speed contra rotating counter rotating proprotor scimitar variable pitch engine instruments annunciator panel electronic centralised aircraft monitor ecam electronic flight instrument system efis engine indicating and crew alerting system eicas flight data recorder glass cockpit engine controls autothrottle full authority digital engine electronics fadec thrust lever thrust reversal fuel and induction systems flame holder jet fuel other systems air start system auxiliary power unit apu bleed air system hydraulic system ice protection system 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 v t e flight instruments pitot static altimeter airspeed indicator machmeter variometer gyroscopic attitude indicator heading indicator horizontal situation indicator turn and slip indicator turn coordinator turn indicator navigational aircraft periscope course deviation indicator horizontal situation indicator inertial navigation system magnetic compass satellite navigation sigi related topics air data inertial reference unit ecam efis glass cockpit head up display integrated standby instrument system primary flight display v speeds yaw string retrieved from https en wikipedia org w index php title autothrottle oldid 1360824242 categories aircraft controls aircraft propulsion components hidden categories articles with short description short description is different from wikidata all articles with unsourced statements articles with unsourced statements from february 2026 this page was last edited on 23 june 2026 at 20 57 utc page was rendered with parsoid text is available under the creative commons attribution sharealike 4 0 license additional terms may apply by using this site you agree to the terms of use and privacy policy wikipedia is a registered trademark of the wikimedia foundation inc a non profit organization privacy policy about wikipedia disclaimers contact wikipedia legal safety contacts code of conduct 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