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Engines of a large passenger jet in flight against a blue sky. No people. Travel concept.

A closeup shot of an aircraft nozzle

Beja, Portugal: EuroDASS Praetorian DASS - this defensive Aid Sub-System (DASS) provides threat assessment, aircraft protection and support measures in extremely hostile and severe environments. The Praetorian system is a modular system consisting of antennas for electronic countermeasures (ECM), electronic support measures (ESM), missile approach warning systems (MAW), laser warning receivers (LWR) and Towed radar decoy (TRD) - portside wingtip of a Eurofighter Typhoon - electronic warfare (EW) - Beja Airport, photo obtained in a public area.

Turbine engine.

Airplane engine exhaust is like vehicle exhaust in general, but this one is more powerful and uses aviation fuel

large aircraft engine

A jet fighter taking off with full afterburner.

Detailed shot of engine outlet of jet

Gando Airport Gran Canaria Spain OCTOBER, 21, 2021 Jet engines of a modern supersonic fighter. Close-up photo. McDonnell Douglas F-18 Hornet of Spanish Air Force

Adjustable exhaust nozzle with partly expanded diffusers - a variable area nozzle is required in a jet engine for optimal expansion and adjusting back pressure in the engine when the afterburner is operated, it avoids compressor surge problems due to the increased back pressure on the engine when the afterburner is lit - engines capable of supersonic flight have convergent-divergent exhaust duct features to generate supersonic flow - GE F110 afterburning turbofan jet engine on F-16 fighters - empennage close-up of exhaust and elevator.

F/A-18 Super Hornet in flight

Sailboat propellers closeup

Single-engine, light utility helicopter's engine with exhaust close-up detail, South Africa

Jet engine of small airplane

F-18 Hornet Engines in taxiing

F/A18 jet fighter flying in the mountain

Side view of an old air craft jet engine without its covers

Lisbon, Portugal: boxed aircraft auxiliary power unit (APU) - the APU is a small turbine engine that provides air and electricity, no hydraulics, but electricity and air can run hydraulic pumps. APUs are typically located in the tail cone of the aircraft, but they can also be located in the engine nacelles or in the wheel wells. APUs can be started using either the aircraft's batteries or a ground power unit (GPU). Once the APU is running, it generates electrical power through a generator. APUs are also used by some airlines to reduce fuel consumption. For example, some airlines use the APU to power the aircraft's air conditioning system on the ground, instead of using the main engines. This can save fuel, as the main engines are more fuel-efficient when they are running at higher speeds - Lisbon Airport, aka Humberto Delgado airport.

Formation flight, catering and details

A military fighter airplane taking off into blue sky.

Fighter jet exhaust nozzle detail on a lot of fighter airplanes in parking position.

Rebuilt, aircraft gas turbine engine on stand.

Sniper Advanced Targeting Pod AN/AAQ-33 under the fuselage of F16 fighter aircraft

Wide angle image of mechanical engineering in Aeronautics. Belonging to a Euro-fighter Typhoon.

Top view of a F-18 Hornet in a high G maneuver, with condensation streaks at the wing root and at the vertical stabilizers

Lisbon, Portugal: Ram Air Turbine (RAT) is a small propellor that will deploy in a serious emergency to supply emergency backup electrical power to the aircraft. Usually this happens after all main engines and the APU (auxiliary power unit) fail. Behind the two-blade propeller a hydraulic pump can be seen, besides power, the RAT provides emergency hydraulic pressure. The RAT generates power from the airstream by ram pressure due to the speed of the aircraft. It may be also called an air driven generator (ADG) -

Flight line of Boeing US Navy T-45 Goshawk jet trainers parked at Gainesville Regional Airport Gainesville Florida photograph taken April 2021

A naval fighter plane on approach for landing.

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