Main gear door issue

[Skymaster337B]

Does your gear door also creep open while the aircraft is parked and not flown for a few days? If so, there is a thermal relief valve in the hydraulic power pack that helps keep the doors closed during thermal expansion. However, this thermal relief valve was not installed on earlier model 337's, unless the power pack was replaced with a new one. Therefore, during thermal expansion the main gear door will open.