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The Integrated Drive Generator (IDG) converts mechanical energy from the engine gearbox into constant-frequency electrical power for the aircraft. Despite variable engine RPM, the IDG delivers a stable output (typically 115 V / 400 Hz), which is critical for all aircraft electrical systems. During IDG replacement, strict attention must...

14,704 次观看 • 5 个月前 •via X (Twitter)

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The Engine Start Levers or Fuel Cut off switches (different name, same switches) control the fuel and ignition for the engines. The 787 shares the same switches and very similar logic to the Boeing 737 Max. The switches have been designed in such a way that they require a very deliberate movement in order for them to move from one position to another. They’re also placed in such a position (below the thrust levers) so that it’s very unlikely that they’ll be knocked. But even if they were, the spring force and detent would prevent them from moving unintentionally. When we move the start levers from the “Run” or “Idle” position, to “Cutoff”, an electrical signal is sent to move the fuel valves from open to close. The engine ignitors are also then de-powered. This stops the supply and ignition of fuel and the engine spools down. Pilots are trained from day one to only touch those switches in flight when called for by a non normal checklist, such as an engine fire or failure. When a fuel switch has to be moved to cutoff in flight, we adhere to a very strict procedure… Pilot monitoring will place their hand on the switch of the damaged engine and both visually and audibly confirm with Pilot flying that the correct fuel switch has been selected. Only after both pilots have confirmed that the correct switch has been selected, will pilot monitoring move that switch to the cutoff position. As an additional layer of safety, some aircraft types only allow the switch to be moved to cutoff in flight if the thrust levers are in the closed or idle position. Do you think that this design feature should be implemented in all aircraft? 📸 by ig/airlinepilotperformance

aircraftmaintenancengineer

149,946 次观看 • 1 年前

Following the Delta A330-323(N813NW) engine failure after departure from São Paulo (GRU), many are asking: what actually happens if an airliner loses an engine just after takeoff? As passenger in the cabin watching this scenario unfold, the panic is understandable. Seeing flames from an engine is alarming. But this is exactly the kind of scenario pilots are trained for repeatedly in simulators. Modern multi-engine aircraft are designed to fly safely on one engine. In fact, losing one engine is a certification requirement during testing. Here’s what happens: At liftoff, pilots target V2 speed—the minimum safe speed that guarantees the aircraft can continue climbing even with one engine inoperative. If an engine fails: • The MASTER FIRE warning light will illuminate in the cockpit and the fire warning bell will sound, alerting the pilots on the affected engine (they will close the fuel, hydraulic shutoff, and engine bleed air valves, and also discharge the related fire bottle to extinguish the engine fire). Of course, they will be careful NOT TO shut down the wrong engine (this has happened before). • Maximum thrust is applied on the remaining engine. • Rudder input keeps the aircraft straight (countering asymmetric thrust) • The aircraft climbs straight ahead for best performance (turns reduce climb rate unless required) Once above a safe altitude (typically ~1,500 ft / Minimum Flap Retraction Altitude(MFRA): • The aircraft accelerates • Flaps are retracted (“cleaning up”) • Crew assesses the situation and plans a return or diversion Even at very low altitude, the aircraft remains controllable by design. It may not climb aggressively, but it will climb. Bottom line: What looks catastrophic from the cabin is a scenario pilots are highly trained to handle—and aircraft are engineered to withstand. Hope this helps any nervous flyer. Flying is safe, and the chances of this happening have reduced due to lessons learned from previous incidents. And if you ever find yourself in this situation, trust that the pilots will act according to their training—because that’s their job.

Turbine Traveller

42,927 次观看 • 3 个月前

AMERICAN AIRLINES FLIGHT 191 — THE DAY THE DC-10 CHANGED AVIATION FOREVER 49 years ago today, May 25, 1979, American Airlines Flight 191 crashed moments after takeoff from Chicago O’Hare, killing all 271 people on board and 2 on the ground. It remains the deadliest single-aircraft crash in U.S. history. The McDonnell Douglas DC-10 had just rotated off Runway 32R when the unthinkable happened: the entire No.1 left engine and pylon tore away from the wing, flipped over the aircraft, and slammed onto the runway. The separation severed critical hydraulic and electrical systems, causing the left wing’s leading-edge slats to retract unexpectedly. With the right wing still producing full lift and thrust, the aircraft became catastrophically unbalanced. The left wing stalled first. Within seconds, the DC-10 rolled violently to a 112° bank angle, nearly inverted, before crashing into a field near a trailer park at the end of the runway. Investigators later discovered the root cause was improper maintenance procedures. To save time, the engine and pylon had been removed together using a forklift instead of following McDonnell Douglas’ approved method. The process damaged the pylon structure, creating cracks that went unnoticed until catastrophic failure occurred during takeoff. Even more tragic: simulator tests later proved the crew did almost everything correctly. Critical stall warning systems had been disabled by the electrical failure, leaving the pilots with no indication the left wing was stalling. Flight 191 reshaped aviation safety forever, leading to stricter maintenance oversight, redesigned inspection procedures, and independent stall warning systems for both pilots. A tragedy that changed aviation history forever. Video shows recreation footage.

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676,967 次观看 • 1 个月前

⚡️🇷🇺🏭 Rostec's unique machine creates an aircraft engine part right at the Metalloobrabotka exhibition. The video shows one of the most technologically advanced domestic machines: the 2000VH five-axis milling machining center. It was created for the needs of the aircraft, engine and defense industries. During the Metalloobrabotka-2025 exhibition, the machine processes one of the most important elements of an aircraft engine - an impeller (blade machine). Such parts are used in aircraft engines. The diameter of this aluminum product is 70 cm, the height is about 30 cm, the weight is about 15 kg. The machine copes with the work perfectly - pay attention to the screen! The equipment was created by our holding company "STAN" . The machine is designed for large-sized parts of complex shape. It is capable of working with products up to 2 m in diameter and weighing up to 5 tons. At the same time, the accuracy achieved is up to hundredths of a millimeter. The model is built on a high-rigidity structure, its internal cavities are filled with synthetic granite. As a result, the vibration resistance of the equipment frame is comparable to heavy cast iron. The machine is equipped with a Russian numerical control system and a liquid cooling system. The use of direct drives allows achieving high dynamic stability and eliminating backlash in movement. Among the built-in functions are systems for measuring tools and parts, monitoring processes and industrial safety. 2000VH has no analogues in technical characteristics among domestic equipment and will replace imported models at Russian enterprises. rostecru

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40,122 次观看 • 1 年前