CCA From Hong Kong, joined Oct 2002, 841 posts, RR: 14
Reply 4, posted (8 years 8 months 1 week 6 hours ago) and read 5449 times:
Probably had a brake deactivated, when the gear is selected up the brakes are applied automatically to stop the wheels spinning , so in this case the gear is left down for 3mins to let the wheel stop spinning.
GIA From Indonesia, joined Oct 2003, 71 posts, RR: 0
Reply 10, posted (8 years 8 months 6 days 21 hours ago) and read 4817 times:
I was at syd airport last month and was listening to the ATC. One time, there was a Qantas B743 ready to take off and i heard that the pilot from this B743 advising the tower that they will not retract their landing gear for about two minutes to cool down the brakes. Might it be for the same reason?
Onedude From United States of America, joined Apr 2005, 214 posts, RR: 0
Reply 14, posted (8 years 8 months 6 days 8 hours ago) and read 4056 times:
I was on QF485 to Perth on an A332 (sorry rego unknown) on Tuesday 21 March. The aircraft was delayed on departure for an hour due to a "technical reason". When we boarded and closed the door, the Captain announced that the landing gear would remain down for 2-3 minutes longer than normal after take off. He also went on to mention that this aircraft had a mandatory engine inspection in Melbourne hence the delay.
Now this was really odd because given the way QF are cycling the A332's through the domestic network, this aircraft could only have been on ground overnight or flown the redeye from PER arriving in around 0515.
So not to discredit the earlier poster, but I don't think brake heat was an issue here. If anyone can shed light on it, I would be keen to know. I am a Platinum flyer with QF and fly 3-4 times a week, and this has never happened before.
VIR744 From United Kingdom, joined Mar 2006, 55 posts, RR: 0
Reply 18, posted (8 years 8 months 6 days 7 hours ago) and read 3472 times:
As previously mentioned, with a deactivated brake the gear retraction is delayed to allow the associated wheel to stop spinning. The brake would normally be cool but the friction from any contact with the aircraft structure in the wheel well, should there be any, would generate a great deal of heat. This could then of course lead to a fire.
The nose wheels, not having brakes, have skid pads fitted in the nose wheel well to stop spinning on retraction.