Boeing Undercarriage Retraction
Mrs Flo was recently on a long haul flight on a 744 and commented that the noise and vibration from the undercarriage (she was back at doors 4) during retraction, was much greater than normal ( she has been 777and 747 CC for going on 25 years so has heard it sufficiently regularly to comment I believe). She had commented on it during the first sector but noticed it again on the second, while of course it may well be nothing she asked me about it and I'm not sure it's the same as the bus.
Question is, does auto brake activate after lift off and stop the main gear from spinning and is it linked to the auto brake used during a rejected take off. Would tyre wear and wheel balance cause vibration and is there any indications of tyre pressure and or vibration on the flight deck? Finally do the flight crew have to do anything to initiate wheel braking during retraction?
Many thanks
A-F....