From: email@example.com ( 0 Falke_Charlie phone dist ) Date: 11 Oct 96 19:44:55 References: 1 2 Followups: 1
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firstname.lastname@example.org (RoyGbvgw) wrote: Peter Coe expressed amazement at a report that a 747 at BA Cardiff had its undercarriage retracted while on the ground. Years ago when I read Nevil Shute's "No Highway", I was skeptical when the hero retracted an airliner's undercart while on the ground to disable the craft. Roy, As I remember it, a technician explains in passing to the good boffin Honey that he (the technician) has just disabled the squat switch mechanism for some reason, and explains the hazard. This will only protect against actively raising the gear, not it's folding up by itself. As another submitter correctly pointed out, even light airplanes are equipped with weight on wheels switches to inhibit accidental gear retraction. At flight test, they put locking pins in the retraction mechanism after landing and before towing. Nobody I've asked so far knows how likely it would be to fold up if the pins weren't there, but it's invariant SOP to put them in. (And to hold them up for the flight crew to see after the pins are pulled. before engine start and taxi.) -- Charlie Falke Pratt & Whitney System Test Team Leader C/O Boeing Comm AP grp.