Autobrake

An autobrake is a type of automatic wheel-based hydraulic brake system for advanced airplanes. The autobrake is normally enabled during takeoff and landing procedures, when the aircraft's longitudinal deceleration system can be handled by the automated systems of the aircraft itself in order to keep the pilot free to perform other tasks.^[1]

Landing

While landing, the autobrake can aid in freeing up the pilot to allow him or her to monitor other systems (such as the execution of the landing flare). There are usually several settings for the "intensity," or hydraulic pressure of the brake mechanism. The selection of these settings are normally done on the aircraft instrument panel before landing. These are often numbered or labelled, with "1" or "LO" referring to braking for a light speed reduction, and subsequent numbers or designations up to "MAX" referring to more abrupt speed reductions.

When the landing feature of the autobrake is engaged, the aircraft automatically engages pressurized wheel braking upon touchdown to the landing surface. During the roll out, application of the brake pedals transfers control back to the pilot.

One of the main advantages of engaging the autobrake as opposed to manually pressing on brake pedals is the uniform deceleration mechanism of the autobrake. The aircraft automatically decelerates at the selected level regardless of other factors, such as aircraft drag and other deceleration methods such as deployment of thrust reversers or spoilers.

Rejected takeoff

While taking off, the aircraft's autobrake can be set to the rejected takeoff mode, commonly indicated on an aircraft instrument panel as RTO. In case of the Airbus A300-600 and A320 family models, "MAX" mode is set. In RTO setting, the aircraft monitors certain variables, depending on the autobrake model. Most autobrakes engage RTO braking if the pilot returns the throttle to the "idle" position, or if reverse thrust is engaged. Other autobrake systems may monitor critical flight controls for failures.

References

↑ Villaume, Fabrice. "Brake-to-Vacate system" (PDF). FAST 44 (Airbus, an EADS Company) (July, 2009): 17–25. ISSN 1293-5476. Retrieved 2009-11-06.

Aircraft components and systems

Airframe structure	Aft pressure bulkhead Cabane strut Canopy 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 Twin tail Vertical stabilizer V-tail Wing root Wing tip Wingbox

Flight controls	Aileron Airbrake Artificial feel Autopilot Canard Centre stick Deceleron Dive brake Electro-hydraulic actuator Elevator Elevon Flaperon Flight control modes Fly-by-wire Gust lock Rudder 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 Blown flap Channel wing Dog-tooth Droop Flap Gouge flap Gurney flap Krueger flap Leading edge cuff LEX Slats Slot Stall strips Strake Variable-sweep wing Vortex generator Vortilon Wing fence Winglet

Avionic and flight instrument systems	ACAS Air data computer Airspeed indicator Altimeter Annunciator panel Attitude indicator Compass Course deviation indicator EFIS EICAS Flight data recorder Flight management system Glass cockpit GPS Heading indicator Horizontal situation indicator INS Pitot-static system Radar altimeter TCAS Transponder Turn and slip indicator Vertical Speed Indicator Yaw string

Propulsion controls, devices and fuel systems	Autothrottle Drop tank FADEC Fuel tank Gascolator Inlet cone Intake ramp NACA cowling Self-sealing fuel tank Splitter plate Throttle Thrust lever Thrust reversal Townend ring Wet wing

Landing and arresting gear	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 Entertainment system Environmental control system Hydraulic system Ice protection system Landing lights Navigation light Passenger service unit Ram air turbine Weeping wing

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