Airworthiness Directive · Amendment 39-10931 · Boeing Model 737-200, -200C, -300, and -400 Series Airplanes
Boeing Model 737-200, -200C, -300, and -400 Series Airplanes
Superseded. A later AD replaced this one: AD 2000-06-13. Comply with the one in force.
The following airplane models, certificated in any category: Model 737-200 and -200C series airplanes, line numbers 6 through 873 inclusive; Model 737-200, -200C, -300, and -400 series airplanes; line numbers 874 through 1642 inclusive; equipped with an aft cargo door having Boeing part number (P/N) 65-47952-1 or P/N 65-47952-524; except: 1. Those airplanes on which that door has been modified in accordance with Boeing Service Bulletin 737-52-1079; or, 2. Those airplanes on which the door assembly having P/N 65- 47952-524 includes four straps (P/N's 65-47952-139, 65-47952-140, 65-47952-141, and 65-47952-142) and a thicker lower cross beam web (P/N 65-47952-157).
This amendment adopts a new airworthiness directive (AD) that is applicable to certain Boeing Model 737-200, -200C, -300, and -400 series airplanes. This action requires repetitive inspections to detect cracking of the corners of the door frame and the cross beams of the aft cargo door, and corrective actions, if necessary. This action also provides an optional terminating action for the repetitive inspection requirement of this AD. This amendment is prompted by reports indicating that fatigue cracks have been detected in the corners of the door frame and the cross beams of the aft cargo door on several in- service airplanes, and by another report indicating that rapid depressurization occurred during flight on one of those airplanes. The actions specified in this AD are intended to prevent fatigue cracking of the corners of the door frame and the cross beams of the aft cargo door, which could result in rapid depressurization of the airplane.
