Tg 747-300
Topic Author
Posts: 1282
Joined: Fri Nov 26, 1999 6:08 am

What Is The Sound Ypu Hear In MD8X After Startup?

Tue Apr 11, 2000 2:49 am

When a MD8X starts up or are beeing pushed back,a ringing sound like an alarm is caming from the back of the aircraft. What is that sound?
Is this sound also on the DC9 and super 80's?

Tg 747-300
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NKP S2
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RE: What Is The Sound Ypu Hear In MD8X After Startup?

Tue Apr 11, 2000 3:29 am

It's not after startup,it's during startup. It's the high energy ignition firing the igniters that is interfering with the PA. Kind of a 1960's science fiction movie sound effect sorta' sound. It stops when the engine reaches 38% N2 along with the air turbine starter cut-out.