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An interesting feature of all three German jet engine designs that saw production of any kind before May 1945: the German BMW 003, Junkers Jumo 004 and Heinkel HeS 011 axial-flow turbojet engine designs was the starter system, which consisted of a Riedel 10 hp (7.5 kW) flat twin two-stroke air-cooled engine hidden in the intake, and essentially ...
As the engine cooled from inactivity, and as the aircraft descended out of the ash cloud, the molten ash solidified and enough broke off for air to again flow smoothly through the engine, allowing a successful restart. The engines had enough electrical power to crank, ignite, and restart because one generator and the on-board batteries were ...
In aviation, a flameout (or flame-out) is the run-down of a jet engine or other turbine engine due to the extinguishment of the flame in its combustor.The loss of flame can have a variety of causes, such as fuel starvation, excessive altitude, compressor stall, foreign object damage deriving from birds, hail, or volcanic ash, severe precipitation, mechanical failure, or very low ambient ...
Most pilot operating handbooks for aircraft with reciprocating fuel injected engines describe specific procedures for starting the engine(s) after a recent shutdown while the engine is still "hot" in an attempt to avoid a vapor lock condition in the fuel feed lines or injector lines and enable a successful engine restart.
The first German jet engines built during the Second World War used a mechanical APU starting system designed by the German engineer Norbert Riedel.It consisted of a 10 horsepower (7.5 kW) two-stroke flat engine, which for the Junkers Jumo 004 design was hidden in the engine nose cone, essentially functioning as a pioneering example of an auxiliary power unit for starting a jet engine.
Since materials change sizes in different temperatures, this happens to the turbine engine. Core lock happens if the engine's parts change too much in size, then some parts will get stuck, reducing or even stopping rotation. Core lock makes it difficult for pilots to perform either a windmill restart or an APU-assisted engine restart.
They lost considerable altitude while continuing unsuccessfully to attempt to restart both the left engine (two times) and the right engine (two times) for more than 14 minutes using the emergency restart procedure. Despite their four APU-assisted engine restart attempts, the pilots were unable to restart the engines because their cores had ...
Standby power on the 747-400 is provided by two batteries and inverters. The captain performed the engine restart procedure, which failed on the first few attempts, and repeated it until restart was achieved. On some of the attempts, as one or more (but not all) engines started to operate, the main generator switched back on.