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What Is The Sound Ypu Hear In MD8X After Startup?  
User currently offlineTg 747-300 From Norway, joined Nov 1999, 1318 posts, RR: 0
Posted (13 years 1 month 2 weeks 4 days 2 hours ago) and read 760 times:

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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1 replies: All unread, jump to last
 
User currently offlineNKP S2 From United States of America, joined Dec 1999, 1714 posts, RR: 6
Reply 1, posted (13 years 1 month 2 weeks 4 days 1 hour ago) and read 698 times:

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.
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