M400 Cooling system noise

[T_Kris]

To view this content we will need your consent to set third party cookies.
For more detailed information, see our cookies page.

Accept third party cookies

M400 sound like a APU spooling down after landing, sounds like an overworking cooling fan. It’s been like this for the last week or so. Should I be concerned? Anyone have similar?

 

[Smittybombs]

Mine just started doing the same today. Upgraded firmware last week, brought it out to test it, and noticed a high pitch whine during flight and the same sort of sound after landing that you describe. Decided not to fly more until I investigate further.