hiwhen i switch the standby power off and on (2 clicks), i hear something that sounds like an aircond. or APU or so. is this normal? why do i only get this sound after i switch the stby.power off and on?i ask, because i have the feeling, that i don't hear all the sounds. for example, in the PMDG 737-700 sound folder i found a file called "APU", but APU-sound is not modeled in the PMDG 737NG (i read this somewhere in the formum), so why is it there?is there a list of what i should/should not hear? (flaps, gear, touchdown, rolling, wind, aircond, cockpit-ambience, etc.....)thanx,stu

"when i switch the standby power off and on (2 clicks), i hear something that sounds like an aircond. or APU or so. is this normal?"Not normal, Stu, but this has been mentioned previously ;-) Personally, I'm not so concerned about the sound... I'd have to say the most important thing is what the switches are actually doing to the NG's electrical system. You wouldn't want your Standby Power system to fail in flight if both engines and the APU also failed (You probably couldn't hear the Standby Power running over the screams of the passengers/First Officer/Jumpseater ;-)).I don't think there is a list of what sounds you would expect to hear. You'd have to ask the pilots on this forum (or real pilot forums, such as PPRuNe) to know what sounds to hear.Hope this helpsCheers.Ian.