Originally Posted by
sailingfun
It also normally involves checks of any standby generators. I don’t know what the ETOPS 737’s have but on a A330 or 767 it’s a HMU type unit. It requires the a hydraulic system to be pressurized and generally takes 10 minutes to complete. Servicing APU oil also takes time getting a stand ect.. Unless you were to put a team of mechanics on the aircraft it all takes time.
HMU checks are done on the ETOPS
overnight checks, not on an ETOPS service check prior to an ETOPS departure and in this case the point is moot because the 737 does not have one. 737 APU oil can be serviced in less than 5 minutes by a properly prepared AMT who would have pre-staged the necessary equipment. An ETOPS service check must be accomplished by 2 mechanics at a minimum. By definition, a team.