Okie From United States of America, joined Jul 2003, 2731 posts, RR: 3 Reply 4, posted (9 years 11 months 3 weeks 2 days 21 hours ago) and read 2140 times:
Probably moaning "after push back" emitting from the loo if it was a 57.
Sorry could not resist after reading the post on the Civial Aviation side.
Lots of noises to be heard before during and after pushback depending on aircraft and starting procedures at that particular airport and particular operator. We need more clues
Aux Hydraulic Pumps
Lamyl_HHLCO From United States of America, joined Aug 2000, 621 posts, RR: 2 Reply 5, posted (9 years 11 months 3 weeks 2 days 13 hours ago) and read 2058 times:
yeah specifically on a A320...right after push back there is a loud noise like when you screw something with a machine, it's abviously not the Flaps or any mecanical noise that i easy recognize... I never heared this noise on a 737 though just the A320.
Lamyl_HHLCO From United States of America, joined Aug 2000, 621 posts, RR: 2 Reply 8, posted (9 years 11 months 3 weeks 2 days 10 hours ago) and read 2018 times:
na i don't think it's the dog barking sound..it's something else ,right after PB and engines starting up then the guys on the ground do something or disconnecting something and it makes like an electric screwdriver noise but very loud...mmm wonder what it is??
HAWK21M From India, joined Jan 2001, 31457 posts, RR: 57 Reply 10, posted (9 years 11 months 3 weeks 2 days 9 hours ago) and read 2011 times:
Probably The Flap drive pump/motor,used to extend the LEDs.At times the Flaps & Slats are extended to position 1 after engine start up for Visual confirmation that they are extended from Ground staff, prior to Taxi out.[In addition to the Indication lts].