From: T.E.Thacker.Junior@lesueloc.com Organization: Performance Systems Int'l Date: 15 Dec 94 05:17:37 References: 1 Followups: 1 2
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In article <airliners.1994.1761@ohare.Chicago.COM>, <firstname.lastname@example.org> writes: > >No, airlines cannot jettison engines in flight. In fact, it usually takes > >a shift or two to change an engine, there are a lot of complex connections > >between the airframe and the engine - electrical, hydraulic, pneumatic, and > >structural. The pilots can't purposely select to jettison an engine but they *CAN* be jettisoned: (1) They are designed in a ditching situation to shear off and flip over the top of the wing rather than dig into the water & pull the wing off. (2) In case of a nasty bad engine fire that is out of control the engine can jettison itself (which happened once on a B747 flight). I don't know how this is triggered (or suppressed) but I know of at least one false jettison (reported in the press as an engine "falling off"). (3) The DC-10 crash in Chicago in the late '70s (that resulted in the grounding of all DC-10's) was because an overstressed connection caused a premature jettison of an engine that flipped over the wing because it was under thrust & was designed to come off that way. The engine jettison caused hydraulic disruptions that deployed a spoiler which the pilot didn't recognize & retract. Coupled with not reducing climb rate, both contributed to the crash.