jc.n From Germany, joined Sep 2001, 28 posts, RR: 0 Posted (12 months 19 hours ago) and read 2616 times:
Today i saw the evening LAN 340 from FRA to MAD taking off, climbing very very slowly (yes, i know: because of the bend of the earth) and not retracting the gear until it disappeared from my eyesight. I only see LAN doing that quite often. What´s the procedure behind it?
DocLightning From United States of America, joined Nov 2005, 16815 posts, RR: 57 Reply 2, posted (12 months 10 hours ago) and read 2112 times:
That's what I've heard, but an A340 is a long-range airliner (especially MAD-SCL) and would have arrived at MAD a good two hours or so prior to departure. How might the brakes have gotten too hot?
Starlionblue From Hong Kong, joined Feb 2004, 15870 posts, RR: 66 Reply 3, posted (12 months 9 hours ago) and read 2086 times:
Quoting DocLightning (Reply 2): That's what I've heard, but an A340 is a long-range airliner (especially MAD-SCL) and would have arrived at MAD a good two hours or so prior to departure. How might the brakes have gotten too hot?
Long taxi with lots of braking? Could that heat the brakes up a lot?
"There are no stupid questions, but there are a lot of inquisitive idiots." - from Citadel by John Ringo
wilco737 From Greenland, joined Jun 2004, 8473 posts, RR: 78 Reply 4, posted (12 months 9 hours ago) and read 2084 times:
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Quoting Starlionblue (Reply 3): Long taxi with lots of braking? Could that heat the brakes up a lot?
Yes, sure. And if the pilots on the previous flight did a very hard braking during landing as well, then 2 hours could be too short to let the brakes cool down enough.
Long taxi with many stop and go can heat up the brakes as well. Especially if you are heavy (which here wasn't the case, flight to MAD is short for an A340).
It could be as well that one brake was deactivated (MEL item), then you cannot retract the gear until the one tire stopped. So you have to wait a special amount of time until it is certain the tire has stopped on its own. You are not allowed to retract the gear with the wheels spinning. Usually they will be braked during retraction, but with one brake inop...
DocLightning From United States of America, joined Nov 2005, 16815 posts, RR: 57 Reply 5, posted (11 months 4 weeks 1 day 21 hours ago) and read 1860 times:
Quoting wilco737 (Reply 4): You are not allowed to retract the gear with the wheels spinning. Usually they will be braked during retraction, but with one brake inop...
Do modern airliners have some indicator that tells the flight deck how fast each wheel is spinning?
longhauler From Canada, joined Mar 2004, 4277 posts, RR: 36 Reply 6, posted (11 months 4 weeks 1 day 14 hours ago) and read 1701 times:
Quoting DocLightning (Reply 5): Do modern airliners have some indicator that tells the flight deck how fast each wheel is spinning?
No, but if one of the brakes is inoperative, then the MEL will state for how long after takeoff the gear must remain extended. This is of course, as the braking function after take off will not work on the inoperative wheel.
It's been a few years since I have seen this MEL, but I recalled the time surprised me, it was somewhere around 2 minutes.
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