Question:

DC-9 Siren?

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what is that siren sound on the start up of dc-9's? 5 seconds after you hear the spool up, the siren starts and lasts like 15 seconds. So, what is it? If it's any help, the airline was Northwest.

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  1. possibility of the PTU  consult your questions in flightlevel350.com there i can proove to you my answer heard this myself in an Airbus aircraft dont know if it  is what you are asking :)


  2. I fly NWA all the time....

    Never herd a siren maybe what you herd was the APU??

    Air New new zealand huh? Like your Aviator.
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