ATA 23-51, Oxygen Mask Microphone

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4 years 1 week ago - 4 years 1 week ago #733 by Mark
ATA 23-51, Oxygen Mask Microphone was created by Mark
A/C just out of "C" check. Both mask mics inop.

After some digging, found wires one and two swapped at back of stowage box plugs.

This reverse bias's the microphone and it will not work.






  • maskmic_091120.jpg
  • MaskMic1_091120.JPEG
  • MaskMic2_091120.JPEG
    • Last edit: 4 years 1 week ago by Mark.

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