FAA 2019-10-51

Requires inspecting the fuselage frame and providing certain information to the FAA. This AD also prohibits installing certain components as part of STC SR00592DE on any helicopter. That STC includes a doubler that reinforces the door frame where recessed medical wall fittings are attached. Prompted by reports of fatigue cracks in the fuselage frame under this doubler. In one case, the crack under the doubler propagated through the inboard frame cap and onto the inboard web. Although the exact cause is still being investigated, the FAA has determined that the cracks are a result of the recessed medical wall rack installation.