COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Boeing 737 Series Aeroplanes AD/B737/1 Amdt 2 Cockpit Side Window - "F-N" Window Post 7/95 Applicability: Boeing 737 serial numbers 1 to 447. Requirement: Inspect visually, by eddy current and by X-ray, as applicable, the "F-N" window post in accordance with Boeing Service Bulletin (SB) 737-53-1023, Revision 11. Note: FAA AD 93-05-17 refers. Compliance: Inspect at the thresholds and intervals specified in Tables I and II of Boeing SB 737- 53-1023, Revision 11. Background: One hundred and sixty two cracks have been experienced on 707, 727 and 737 aircraft in the subject region, including aircraft that have been modified and repaired to earlier issues of the SB. This SB has been identified by the B737 Ageing Aircraft Structures Working Group as a safety of flight item and requires the area to be modified; Directive AD/B737/40 refers. Amendment 1 extended the inspection area to structure above the cockpit window. Amendment 2 revises the Applicability.