Motorcycles are kinda like helicopters. Some people refer to some of both as choppers. The standard safety briefing for a CH-47 (Chinook) includes a warning about hydraulic fluid on the rear ramp is a slip hazard when entering/exiting the aircraft, followed immediately by the crew chief saying, "And if there isn't any leaking onto the ramp, don't get on board. It means the bird is OUT of hydraulic fluid." If you stop hearing/feeling that clunk, don't try to ride it!
Kinda like an aircraft radial engine. When it is not running, if it is not leaking oil, don't start it...it is out of oil.
Originally Posted by Musashi
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