COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY
SCHEDULE OF AIRWORTHINESS DIRECTIVES
Boeing 727 Series Aeroplanes
AD/B727/101
Amdt 1
Rear Pressure Bulkhead Web 9/86
Applicability: All Model 727 aeroplanes.
Requirement: Inspect in accordance with Figure 1 of Boeing Alert SB 727-53A0171 Revision 1, until modified in accordance with either:
- Paragraph D of the Accomplishment Instructions in Boeing Alert S.B. 727- 53A0171, Revision 1; or
2. Paragraphs E and F of the same S.B.
Note: FAA AD 86-02-06 Rev. 1 refers.
Compliance: (a) before exceeding 33,000 flights; or
(b) within the next 1,500 flights after 30 September 1986;
whichever is the later, and thereafter at intervals not exceeding 3,500 flights.
Background: This Directive implements Boeing Alert Service Bulletin 727-53-0171 Revision 1 which was raised following the discovery of cracks in thirty airframes. Cracking is attributed to fatigue under cabin pressure cycling. Amendment 1 to this Directive removes the repetitive inspection requirement for aircraft that have incorporated the preventative modification. It also requires that , within 15,000 landings after repair with the - 1 repair kit, certain aircraft must be modified by incorporation of a reinforcing strap.