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McDonnell Douglas PA system

Tue May 19, 2020 8:00 pm

Whenever I fly on a MD-80 or 88 or 90 (especially delta) whenever the intercom system is in use there’s A continuous whiny sound in the background, what is that, and why is it only on MD airplanes?
Last edited by atcsundevil on Tue May 19, 2020 8:03 pm, edited 1 time in total.
Reason: Edited spelling in title; non descriptive thread title
Posts: 10
Joined: Sat Jul 06, 2019 9:25 am

Re: McDonnell Douglas PA system

Tue May 19, 2020 9:42 pm

Interference from the 400Hz AC system, aircraft with better shielding/filtering might not make this sound over the PA.

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