DL767captain From United States of America, joined Mar 2007, 2539 posts, RR: 0 Posted (7 years 9 months 3 weeks 4 days 14 hours ago) and read 8758 times:
I was watching a video on first flights and test flights and i noticed that they keep the landing gear down for the entire flight sometimes, and the other times don't retract the gear until a high altitude. So why do they do this?
2H4 From United States of America, joined Oct 2004, 8956 posts, RR: 59
Reply 6, posted (7 years 9 months 3 weeks 4 days ago) and read 8221 times:
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Quoting KiloMikePapa (Reply 3): The gear is pretty essential ... for getting that expensive prototype and the possibly even more expensive test pilot back in a state allowing additional test flights
Yeah, I could have worded that better. I was thinking about how it's not so essential to retract the gear, considering the airplane can fly with the gear down. Best to leave it down until the systems essential for flight are shaken down and proven.
Mir From United States of America, joined Jan 2004, 22491 posts, RR: 55
Reply 8, posted (7 years 9 months 3 weeks 3 days 11 hours ago) and read 8047 times:
On a test flight, a lot of the equipment is unproven, so they only want to mess with it in a controlled setting with time to troubleshoot if things should go wrong - at altitude. Just in case something bad did happen on the takeoff and they needed to come around for landing, it wouldn't be ideal to have the first extension of the gear be one where they really needed it down, and needed it down quickly.
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Stratosphere From United States of America, joined Sep 2007, 1692 posts, RR: 5
Reply 13, posted (7 years 1 month 20 hours ago) and read 6920 times:
On a test flight anything goes basically.. But in the revenue world I have seen both gear slow to retract ( usually brake cooling) and I have seen gear dropped way early. I was on a NW DC-10 into MSP that dropped the gear with no flaps pretty high up. The Capt came on and said we were a little high and he would be dropping the gear to lose altitude.
HAWK21M From India, joined Jan 2001, 31808 posts, RR: 55
Reply 14, posted (7 years 1 month 8 hours ago) and read 6841 times:
Quoting Stratosphere (Reply 13): I was on a NW DC-10 into MSP that dropped the gear with no flaps pretty high up. The Capt came on and said we were a little high and he would be dropping the gear to lose altitude.
UAL Bagsmasher From United States of America, joined Sep 1999, 2153 posts, RR: 9
Reply 15, posted (7 years 1 month 7 hours ago) and read 6832 times:
UPSMD11, chances are the aircraft in question had an MEL for the MLG bay overheat system. One of the stipulations is that the gear must be left down for so many minutes to ensure proper tire and brake cooling, since you have no way of knowing if that gear is overheating with the overheat system MEL'd.