Check at annual

[SkyKing]

Our 1977 P-model had the alternate air door come loose also, but in our case the rivets holding the magnet were letting go, but fortunately we caught it during a 25-hour check before any damage occurred. It's good to check the door hinge AND the magnet attach points every on a routine basis other than just at annual because of the vibration and air flow in these areas.

SkyKing