787 Dreamliner late undercarriage retraction
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787 Dreamliner late undercarriage retraction
I live close to Edinburgh Airport where there is a daily Qatar 787 service to Doha. I have noticed that occasionally the aircraft does not retract its gear right after takeoff but will leave it until it is well over 4,000 feet and several miles from the airport. Does anyone know why this happens, is it 787 SOP for cooling?
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Happened to me years ago with an Air France A310. AS it climbed away I said "You still have the gear down"...... "Affirmative, we use it for ze take-off". I never lived that down.
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On early 787s the wizzo-magic brake & tyre pressure monitoring system ( mounted on the gear ) often overheated, forcing operators to resort to the old-school technique of dangling the gear in the airstream since they didn't know how hot the brakes were...
Are Qatar 787s early-builds?
Are Qatar 787s early-builds?
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It could be an anti-skid fault which may prevent the brakes being applied during retract.
So you let the wheels spin down before retracting them.
3+ minutes on the older A-310
So you let the wheels spin down before retracting them.
3+ minutes on the older A-310
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It's probably got a wheel brake deactivated because of a fault, which is allowed in the 787 Dispatch Deviations Guide (DDG)
From the 787 DDG:-
Wheel Brakes may be inoperative on one main landing gear wheel per truck provided (amongst other things) the inoperative brake is deactivated and after takeoff, the gear remains down for two minutes before retraction.
As part of the normal retraction sequence, the wheel brakes are applied to stop the wheels spinning before they enter the gear bay. If a brake is deactivated, the affected wheel cannot be braked so the gear is left down for 2 minutes to ensure the wheel has stopped spinning
FF
From the 787 DDG:-
Wheel Brakes may be inoperative on one main landing gear wheel per truck provided (amongst other things) the inoperative brake is deactivated and after takeoff, the gear remains down for two minutes before retraction.
As part of the normal retraction sequence, the wheel brakes are applied to stop the wheels spinning before they enter the gear bay. If a brake is deactivated, the affected wheel cannot be braked so the gear is left down for 2 minutes to ensure the wheel has stopped spinning
FF
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DaveReid,
Three minutes for the wheels to spin down ?
You're having a laugh.
No laughing matter. If one wheel is still spinning, it's one hell of a massive gyroscope. The precessional forces would be pretty large.
Three minutes for the wheels to spin down ?
You're having a laugh.
No laughing matter. If one wheel is still spinning, it's one hell of a massive gyroscope. The precessional forces would be pretty large.