AIRWORTHINESS DIRECTIVE
For the reasons set out in the background section, the CASA delegate whose signature appears below revokes Airworthiness Directive (AD) AD/B737/124 Amdt 1 and issues the following AD under subregulation 39.1 (1) of CAR 1998. The AD requires that the action set out in the requirement section (being action that the delegate considers necessary to correct the unsafe condition) be taken in relation to the aircraft or aeronautical product mentioned in the applicability section: (a) in the circumstances mentioned in the requirement section; and (b) in accordance with the instructions set out in the requirement section; and (c) at the time mentioned in the compliance section.
Boeing 737 Series Aeroplanes
AD/B737/124
Amdt 2
Aft Cargo Door Frame and the Cross Beams 10/2001
Applicability: Model 737-200 and -200C series aircraft, line numbers 6 through 873.
Model 737-200, -200C, -300, and -400 series aircraft, line numbers 874 through 1642; equipped with an aft cargo door having Boeing part number (P/N) 65-47952-1 or P/N 65-47952-524, except:
- Those aircraft on which that door has been modified in accordance with Boeing Service Bulletin 737-52-1079; or,
- Those aircraft 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).
Requirement: Action in accordance with the technical requirements of FAA AD 2000-06-13 R1 Amdt 39-12317.
Compliance: As specified in the Requirement document for the inspection and modification requirements, with a revised effective date of 4 October 2001.
This amendment becomes effective on 4 October 2001.
Background: The FAA received 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 aircraft, and another report indicating that rapid depressurisation occurred during flight on one of these aircraft.
Amendment 1 required repetitive high frequency eddy current inspections, and also mandated accomplishment of the previously optional terminating action.
Amendment 2 is issued in response to a new FAA AD, which revises the compliance time for the terminating modification.
Amendment 1 of this Airworthiness Directive became effective on 12 July 2000.
Boeing 737 Series Aeroplanes
AD/B737/124 Amdt 2 (Continued)
The original issue of this Airworthiness Directive became effective on 25 March 1999.
David Alan Villiers
Delegate of the Civil Aviation Safety Authority 24 August 2001
The above AD is notified in the Commonwealth of Australia Gazette on 12 September 2001.