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Aircraft gas turbine function
Bleed air in aerospace engineering is compressed air taken from the compressor stage of a gas turbine engine, upstream of its fuel-burning sections. Automatic
Bleed_air
Gas turbine gearbox
engine. In some engines, bleed air is also tapped to provide power for accessories, as well as a mechanical shaft drive. Bleed air is particularly useful
Accessory_drive
System to limit ice on aircraft surfaces
which complicates en route stops. Bleed air systems are used by most large aircraft with jet engines or turboprops. Hot air is "bled" off one or more engines'
Ice_protection_system
Aircraft system which maintains internal pressurization, climate, air supply, and more
engine, upstream of the combustor. The temperature and pressure of this bleed air varies according to which compressor stage is used, and the power setting
Environmental_control_system
Aircraft cabin air contamination
A fume event occurs when bleed air used for cabin pressurisation and air conditioning in a pressurised aircraft is contaminated by fluids such as engine
Fume_event
Turbojet engine component
and flame holders and by cooling the liner and nozzle with compressor bleed air instead of turbine exhaust gas. In heat engines such as jet engines, efficiency
Afterburner
Power source for starting large engines
engine (bleed air) on a multi-engined aircraft, or from an air compressor mounted on ground support equipment. Compared with electric starters, air-starters
Air-start_system
Airbreathing jet engine which is typically used in aircraft
compressor rotates around 50,000 RPM.[citation needed] Turbojets supply bleed air from the compressor to the aircraft for the operation of various sub-systems
Turbojet
Machine for continuous flow gas compression
starting in the 1950s would "bleed" air out of the middle of the compressor in order to avoid trying to compress too much air in the final stages. This was
Axial_compressor
electrical supply can be provided by a ram air turbine (RAT) or Hydrazine powered turbines. Bleed air is compressed air taken from the compressor stage of a
Aircraft_systems
Supersonic atmospheric jet engine
Abernethy, "Recover Bleed Air Turbojet", published 3 October 1967 "FLASHBACK: Triplesonic Interceptors: The F-103, F-108 & YF-12A". Air Force Materiel Command
Ramjet
Alternative vehicle power source
though some APUs extract bleed air from the power section compressor. There are two actuated devices to help control the flow of air: the inlet guide vanes
Auxiliary_power_unit
1989 aviation accident in England
engine was malfunctioning, because in earlier Boeing 737 variants, bleed air for cabin air conditioning came from the right engine. Starting with the Boeing
Kegworth_air_disaster
Topics referred to by the same term
microphone intended for a different source Bleed, the presence of surface water on concrete Bleed air, compressed air taken from gas turbine compressor stages
Bleeding_(disambiguation)
Aircraft refrigeration
in the ACM by a centrifugal compressor, two air-to-air heat exchangers and an expansion turbine. Bleed air from the engines, an auxiliary power unit, or
Air_cycle_machine
remote compressor). After the first engine is started using APU bleed air, cross-bleed air from the running engine can be used to start the remaining engine(s)
Aircraft_engine_starting
Type of gearbox used on jet engines
often took advantage of the bleed air available from the engines. Some of these were mostly mechanically powered, with an air turbine to provide a vernier
Constant-speed_drive
Gas turbine used to spin a shaft
the original on 2015-12-22. Retrieved 2019-11-02. "Smithsonian National Air and Space Museum - Kaman K-225". airandspace.si.edu. NASM. Retrieved January
Turboshaft
US Air Force supersonic aircraft, 1964–1998
and are explained in his patent, "Recover Bleed Air Turbojet". His solution was to 1) incorporate six air-bleed tubes, prominent on the outside of the engine
Lockheed_SR-71_Blackbird
Temporary diversion of an aircraft engine's thrust
business jets. One exception is the BAe 146 which has a fuselage tip-mounted air brake instead. It is also not always required for all engines on a particular
Thrust_reversal
Computer used for engine control in aerospace engineering
Engine operating parameters such as fuel flow, stator vane position, air bleed valve position, and others are computed from this data and applied as
FADEC
High-speed jet engine by Pratt & Whitney
afterburner was cooled by the bleed air that was 400 °F (220 °C) cooler than the turbine exhaust gas. Not all the oxygen in the bleed air was available for combustion
Pratt_&_Whitney_J58
Medium to transfer power in hydraulic machinery
December 2014. "DOT Brake Fluid vs. Mineral Oil - and the Winner is." EpicBleedSolutions.com. Retrieved 3 May 2017. "Power Steering Fluid". www.AA1car.com
Hydraulic_fluid
Brief description of components needed for jet engines
control air for cooling and prevent stray air flows into turbine cavities. A series of (e.g. labyrinth) seals allow a small flow of bleed air to wash
Components_of_jet_engines
Type of engine issue in aviation
sudden or inappropriate thrust lever movements, which resulted in incorrect air-fuel ratios in the combustion chamber. Modern engines are much more robust
Flameout
Type of rocket engine
program launch. The company reported rotating detonations of a compressed fuel-air mixture in the presence of the supersonic airflow necessary for speeds above
Rotating_detonation_engine
Gas turbine phenomenon
A compressor anti-stall system is a compressor bleed system that automatically dumps away unwanted air to prevent compressor stalling. Other methods of
Compressor_stall
Large twin-aisle airliner family
density than the TPE331 from which it is developed, and the air management system: the bleed air, environmental control, cabin pressure control and supplemental
Airbus_A350
Shock-induced combustion ramjet engine
(sodramjet); or simply referred to as shock-ramjet engine) is a concept of air-breathing ramjet engine, proposed to be used for hypersonic and/or single-stage-to-orbit
Shcramjet
Aircraft propulsion system efficient at a range of speeds higher and lower than sound's
and final-descent. In series mode, air enters in the front of the engine. After passing through the front fan, the air passes directly into the second fan
Variable_cycle_engine
Turbofan jet engine
eliminated the bleed air system using high temperature/high pressure air from the propulsion engines to power aircraft systems such as the starting, air-conditioning
General_Electric_GEnx
Jet engine
Pressure ratio is increased to 50:1, and it has a 112 in (280 cm) fan and a bleed air system. Fuel consumption is improved by 11%. Announced on 14 July 2014
Rolls-Royce_Trent_7000
2001 aviation accident in Portugal
of bleed air to maintain cabin pressurization. Five minutes later, at 06:31 UTC, the oxygen masks dropped down in the passenger cabin. Military air traffic
Air_Transat_Flight_236
2004 aviation accident in Missouri
engines are not operating. An engine restart can be conducted by using bleed air from the APU to rotate the engine core. The Bombardier CRJ200 is equipped
Pinnacle_Airlines_Flight_3701
Avionics system developed by Airbus
failures that require crew attention but not immediate action. For example, air bleed failure or fuel fault. They have no direct consequence to flight safety
Electronic centralised aircraft monitor
Electronic_centralised_aircraft_monitor
Gas venting method for a hydraulic system
A bleed screw is a device used to create a temporary opening in an otherwise closed hydraulic system, which facilitates the removal of air or another substance
Bleed_screw
Engine where combustion is pulsed instead of continuous
and is capable of running statically (that is, it does not need to have air forced into its inlet, typically by forward motion). The best known example
Pulsejet
Process to maintain internal air pressure in aircraft or spacecraft
cold outside air has reached the bleed air valves, it has been heated to around 200 °C (392 °F). The control and selection of high or low bleed sources is
Cabin_pressurization
Jet engine where combustion takes place in supersonic airflow
speed to compress the incoming air forcefully before combustion (hence ramjet), but whereas a ramjet decelerates the air to subsonic velocities before
Scramjet
Business jet in the US
temperature of the pressure bleed air that is routed through the cabin. The bleed air is cooled in the heat exchanger by ram air entering the dorsal fin inlet
Learjet_25
Piston engine starting system
the compressor and air tank. Hybrid systems can be made simply by adding a cartridge breech or an air tank to an existing system. Air tanks can also be
Coffman_engine_starter
Engine fuel systems in aircraft
thermometers and heating systems. Many are pressurized with engine bleed air to keep moist air out and ensure positive pressure feed to the pumps. In larger
Aircraft_fuel_system
Methods for transmitting power from a source to an application
PTO units: internal gearbox, external gearbox, radial drive shaft, and bleed air, which are used to power engine accessories. In some cases, aircraft power
Power_take-off
Two-propeller design for improving low-airspeed maneuverability
low, the mass of the air flowing through the propeller disk (thrust) causes a significant amount of tangential or rotational air flow to be created by
Contra-rotating_propellers
Small power source installed on aircraft
A ram air turbine (RAT) is a small wind turbine that is connected to a hydraulic pump, or electrical generator, installed in an aircraft and used as a
Ram_air_turbine
British turbofan engine, developed from earlier Trent series engines
the decided order book. The Rolls-Royce Trent 7000 is a version with bleed air used for the Airbus A330neo. In 2003, Rolls-Royce was offering a scaled
Rolls-Royce_Trent_1000
Soviet turbofan engine
with bleed air from after the 6th stage for roll control. Both compressors are driven by a pair of counter-rotating 2-stage turbines. However the bleed air
Tumansky_R-79V-300
Modification on an aircraft
compressor bleed air, in front of each engine. This modification was used by Alaska Airlines for many years, and is still employed by Air Inuit, Canadian
Gravel_kit
Turbine engine driving an aircraft propeller
nozzle. Air enters the intake and is compressed by the compressor. Jet fuel is then added to the compressed air in the combustor, where the fuel-air mixture
Turboprop
Type of rocket engine
amount of gas out of the center of a shorter truncated spike (like base bleed in an artillery shell). In the linear aerospike the spike consists of a
Aerospike_engine
Aerofoil; individual component of a turbine disc
blades. Injecting the cooler bleed into the flow reduces turbine isentropic efficiency; the compression of the cooling air (which does not contribute power
Turbine_blade
Engine component
the air flows from stage to stage. The role of the rotor blades is to accelerate the incoming air for increasing the kinetic energy of the air. Then
Gas turbine engine compressors
Gas_turbine_engine_compressors
Twin-aisle airliner family
passenger comfort. Cabin air pressurization is provided by electrically driven compressors, rather than traditional engine-bleed air, thereby eliminating
Boeing_787_Dreamliner
Aircraft propulsion component
Propeller-driven fixed-wing aircraft are the earliest type of powered heavier-than-air aircraft (i.e. aerodynes), with the Wright Flyer (which used two push propellers
Propeller_(aeronautics)
Aircraft cockpit with electronic displays
replaced by electronic attitude and heading reference systems (AHRS) and air data computers (ADCs), improving reliability and reducing cost and maintenance
Glass_cockpit
Robust aircraft electronic recording device
the Finnish Air Force repaired or built in its main aviation factory in Tampere, Finland. During World War II, both British and American air forces successfully
Flight_recorder
1974 aviation accident in Kenya
have failed to open the slat system bleed air valves as required on the pre-flight checklist. This prevented bleed air from flowing to the 747's pneumatic
Lufthansa_Flight_540
Mechanical device
induction systems Flame holder Jet fuel Other systems Air-start system Auxiliary power unit (APU) Bleed air system Hydraulic system Ice protection system
Propeller speed reduction unit
Propeller_speed_reduction_unit
Type of aviation fuel
(min. 60 °C or 140 °F). Because some US naval air stations, Marine Corps air stations and Coast Guard air stations host both sea and land based naval aircraft
Jet_fuel
Type of airfoil
CV-22 'Osprey' and the Impact on Air Force Combat Search and Rescue" (PDF). Archived 2016-03-06 at the Wayback Machine Air Command and Staff College, April
Proprotor
Czech engineering and manufacturing company
V/200 V/ 400 Hz, max. bleed air: 28.3 kg/min, max. altitude: 6,000 m, weight: 64 kg. The unit is designed to deliver compressed air for starting the main
PBS_Velká_Bíteš
Engine part
of air. Some studies have suggested that adding a small amount of base bleed to a V-gutter helps reduce drag without reducing effectiveness. The most
Flame_holder
Manual control of the thrust of an aircraft's engines from the cockpit
bullet Propelling nozzle Turbine blade Principles Aircraft engine starting Bleed air Brayton cycle Bypass ratio Compressor stall Engine pressure ratio (EPR)
Thrust_lever
Part of a jet engine where fuel is burned
high-pressure air by the compression system. The combustor then heats this air at constant pressure as the fuel/air mix burns. As it burns the fuel/air mix heats
Combustor
25-500-kW internal combustion engine, typically Brayton cycle-type
bearings impractical—they require air bearings or possibly magnetic bearings. They may be designed with foil bearings and air-cooling operating without lubricating
Microturbine
Aerospace equipment manufacturing company
aircraft flight control and actuation systems, landing gear, air management systems (bleed air systems, wing anti ice, etc.), on-board electronics as well
Liebherr_Aerospace
American low-bypass turbofan engine for the F-22 Raptor
"Lamilloy" from Detroit Diesel Allison and "transpiration cooled" from engine bleed air to withstand the heat of the exhaust. The specialized YF119 variants on
Pratt_&_Whitney_F119
Turbomachinery concept
Study of Space Plane Powered by Air-Turbo Ramjet with Intake Air Cooler." part of Japan's ISAS (now JAXA) study into an air-turbo ramjet (ATR, later ATREX
Precooled_jet_engine
Pressurized, twin-engined piston aircraft produced 1968–1983
cabin. The engines are turbocharged, which also pressurize the cabin with bleed air. Development of the Beechcraft 60 began in early 1965, which was designed
Beechcraft_Duke
Jet nozzle at the tip of some helicopter rotor blades
nothing but a single blade with a tip rocket. Tip jets can use compressed air, provided by a separate engine, to create jet thrust. Other types use a system
Tip_jet
Vehicle or machine that can fly by gaining support from the air
or aerial vehicle is a vehicle that can fly by gaining support from the air. It counters the force of gravity by using either static lift or the dynamic
Aircraft
System that allows a pilot to control thrust without manually setting fuel flow
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
Autothrottle
Ice protection system installed on aircraft
preventing ice from forming. Sources of heat include: Bleed air systems use high-temperature, compressed air from the engine compressor sections, and duct it
Deicing_boot
Airbreathing jet engine designed to provide thrust by driving a fan
bypass is to provide cooling air. This sets the lower limit for BPR and these engines have been called "leaky" or continuous bleed turbojets (General Electric
Turbofan
Turboshaft with power from independent exhaust
turboshaft ingests air through an intake. The air passes through a compressor and into a combustor where fuel is mixed with the compressed air and ignited.
Free-turbine_turboshaft
Type of jet engine with no moving parts
fuel (propane) before being injected into the air-fuel inlet. In the combustion chamber, the fuel/air mixture ignites and burns, creating thrust as it
Gluhareff_Pressure_Jet
Simplest known jet propulsion device
aircraft such as cruise missiles and target drones. A pulsejet engine is an air-breathing reaction engine that employs an ongoing sequence of discrete combustion
Valveless_pulsejet
Propeller with blades that can be rotated to control their pitch while in use
microlights. When an aircraft is stationary with the propeller spinning (in calm air), the relative wind vector for each propeller blade is from the side. However
Variable-pitch propeller (aeronautics)
Variable-pitch_propeller_(aeronautics)
Afterburning turbofan aircraft engine
Gas-Driven Lift Fan (GDLF) by McDonnell Douglas that used the main engine bleed air to power a lift fan, and further developments of direct lift thrust vectoring
Pratt_&_Whitney_F135
Type of aircraft engine
Texas Air & Space Museum. Retrieved July 18, 2019. GE Aircraft Engines 1987. "Manufacturers positioning for coming competitive battles". Air Transport
Propfan
Type of aircraft
horizontal and vertical stabilizers), wing anti-ice provided by engine bleed air, cabin with four more windows and access from the cabin to the baggage
Gulfstream_G280
Flight control surface meant to increase drag
In aeronautics, air brakes, or speed brakes, are a type of flight control surface used on an aircraft to increase the drag on the aircraft. When extended
Air_brake_(aeronautics)
Aircraft engine that produces thrust by emitting a jet of gas
of reaction engine, discharging a fast-moving jet of heated gas (usually air) that generates thrust by jet propulsion. While this broad definition may
Jet_engine
Gas which does not chemically react under the specified conditions
Air Separation Modules (ASMs) have been used to generate inert gas. ASMs contain selectively permeable membranes. They are fed compressed bleed air from
Inert_gas
1959 American four-engined jet airliner series
high-pressure air for cabin pressurization. The engines could not supply sufficient bleed air for this purpose without a serious loss of thrust. The small air inlets
Boeing_720
Nozzle that converts the internal energy of a working gas into propulsive force
additional and separate propelling nozzle which further accelerates the bypass air. Propelling nozzles also act as downstream restrictors, the consequences
Propelling_nozzle
Formation of water ice on aircraft surfaces
common approach is to route engine "bleed air" into ducting along the leading edges of wings and tailplanes. The air heats the leading edge of the surface
Icing_(aeronautics)
Main body of an aircraft
Escape crew capsule Other systems Aircraft lavatory Auxiliary power unit Bleed air system Deicing boot Emergency oxygen system Environmental control system
Fuselage
Wing surface area adjuster, typically for shortening take-off and landing
engine to shape the flow of air over the wing, replacing or modifying the action of the flaps. Blown flaps take "bleed air" from the jet engine's compressor
High-lift_device
Engine feature
induction systems Flame holder Jet fuel Other systems Air-start system Auxiliary power unit (APU) Bleed air system Hydraulic system Ice protection system
Autofeather
British international aerospace company
Avionics new Generation Integrated Cockpit (MAGIC) for business aircraft, bleed air leak detection (BALD) system, and its Electro-Thermal-based Ice Protection
Meggitt
Display system in an aircraft's cockpit which displays flight information electronically
altitude on the PFD, and by comparing it with the actual altitude (from the air data computer) generates an altitude error display. This same altitude selection
Electronic flight instrument system
Electronic_flight_instrument_system
Airline of the United States
pilot union had started alerting pilots of the danger of contaminated bleed air, including contacting crew members that the union thinks were exposed
American_Airlines
Proportion of ducted compared to combusted air in a turbofan engine
bypass is to provide cooling air. This sets the lower limit for BPR and these engines have been called "leaky" or continuous bleed turbojets (General Electric
Bypass_ratio
Nautical terms for direction
Escape crew capsule Other systems Aircraft lavatory Auxiliary power unit Bleed air system Deicing boot Emergency oxygen system Environmental control system
Port_and_starboard
Group of lights as a status indicator
Escape crew capsule Other systems Aircraft lavatory Auxiliary power unit Bleed air system Deicing boot Emergency oxygen system Environmental control system
Annunciator_panel
Type of alert system on aircraft
bullet Propelling nozzle Turbine blade Principles Aircraft engine starting Bleed air Brayton cycle Bypass ratio Compressor stall Engine pressure ratio (EPR)
Engine-indicating and crew-alerting system
Engine-indicating_and_crew-alerting_system
Hydraulic fluid used in aviation
cabin pressure superchargers (as piston-engined airliners do not have 'bleed air' pressurisation) used in the DC-6 and -7 series piston-engined aircraft
Skydrol
Referencing standard for commercial aircraft
and engineers alike. The standard numbering system was published by the Air Transport Association on June 1, 1956. While the ATA 100 numbering system
ATA_100
Aviation accident in Australia
air passed into the cabin is controlled by bleed air valves on the engines. The positions of the bleed air valves can be altered by the pilot. According
2000 Queensland Beechcraft King Air crash
2000_Queensland_Beechcraft_King_Air_crash
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BLEED AIR
BLEED AIR
BLEED AIR
BLEED AIR
BLEED AIR
BLEED AIR
BLEED AIR
BLEED AIR
BLEED AIR
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