What's that change in noise? on the B737
helloo,
i was wondering if anyone could help me
Imagine that the APU is running on the B737 (the pilots have just switched it on, as they will be starting the engines within the next five minutes, let's say) Imagine the noise in your head of the apu running.....
Now it's either when the APU bleed is switched on, or when the APU bleed is already on and then both packs are positioned into the off position that there is the change in noise.... ?? it's kind of like a noise of shooting air.. it's like the noise of the apu has changed...
does anybody get what i'm on about?
thanks