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Also, lowering landing gear was the international signal for surrender - lowered gear was not always caused through damage.
Most of the time and depending on the aircraft - no.I know they used hydraulics, electric, or manual methods to retract the gear. But surely they don't depend on hydraulic, etc. to keep them up ?
Depends on the country and aircraft. The aircraft I mainly work on (L29s, 39s and most recently MiG-15UTI are all hydraulicThe locks are automatic and require what method to unlock ? Manual ? Electric ? I'm sure there's many different systems, but just in general ?
Not military, but I remember being on a Convair 880 that was pretty much buttoned up shortly after takeoff when a pronounced THUD and wind noise announced that the landing gear had fallen back down. Probably had something to do with copious hydraulic fluid streaming from the wing.
I suppose a down default is the better option.