COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Piper PA-31 Series Aeroplanes AD/PA-31/108 Aft Bulkhead, Fuselage Stn. 332.0 2/85 TLX Applicability: All models PA-31P with S/Nos 31P-3 to 31P-7730012 which have achieved 1000 hours or more time in service. Requirement: Action in accordance with Piper SB No. 802. Compliance: Within 25 hours time in service after 9 January 1985 and thereafter at intervals not exceeding 200 hours time in service until either reinforcement kit, Piper P/No. 764- 983 or reinforced replacement bulkhead, Piper P/No. 45583-16 is installed. Background: The manufacturer reports instances of cracking in the AFT fuselage bulkhead.