As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE ALTERNATE AIR DOOR HINGE IS ATTACHED BY 3 (AN470AD3) SOLID RIVETS. THE 3 RIVETS SHEARED AND THE AIR DOOR BECAME LODGED IN THE FUEL CONTROL SERVO THROTTLE BODY. THIS OCCURRED ON TAKEOFF AND THE PILOT WAS ABLE TO SET THE AIRCRAFT BACK DOWN SAFELY. RECOEND LARGER SUPPORT FOR HINGE AND MORE RIVETS OF LARGER SIZE.