{"id":"F2006B05799","name":"AD/PA-31/94 Amdt 2 - Fuselage Bulkhead at STA.317.5","slug":"ad-pa-31-94-amdt-2-fuselage-bulkhead-at-sta-317-5","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":135716,"registerId":"commonwealth-F2006B05799-current","compilationNumber":null,"startDate":"2026-04-03","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/PA-31/94 Amdt 2 - Fuselage Bulkhead at STA.317.5","content":"COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 \\- 105 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n![](image.001.png)  \nPiper PA-31 Series Aeroplanes\n\nAD/PA-31/94\n\nAmdt 2\n\n  \nFuselage Bulkhead at STA.317.5 10/96\n\nApplicability: Models Serial Numbers\n\nPA31, PA31-300 and PA31-325 31-2 through 31-7912039 PA31-350 31-5001 through 31-7952071\n\nRequirement: 1. Inspect the upper section of the Fuselage Station 317.75 bulkhead for cracks in accordance with the Instructions section of Piper Service Bulletin 636A.\n\n    If any crack is found, incorporate Piper Kit 764-028 in accordance with the instructions included with that kit, revised 18 June 1990.\n\n    b. If no crack is found, incorporate Piper Kit 763-917 in accordance with the instructions included with that kit, revised 18 June 1990.\n\nNote: FAA AD 96-12-12 Amdt 39-9654 refers.\n\nCompliance: Within 100 hours time in service after 12 September 1996, unless Piper Kit 764-028 or Piper Kit 763-917 is already incorporated.\n\nBackground: Instances have occurred of cracks developing in the bulkhead flange area of STA.317.75 at the attachment point for the vertical fin forward spar.\n\nAmendment 1 introduced amendment A of the Requirement Document.\n\nAmendment 2 is issued to reflect a new FAA AD which was issued in response to further reports of cracks and the Federal Aviation Administration's policy on ageing commuter-class aircraft by eliminating or, in certain instances, reducing the number of repetitive short-interval inspections when improved parts or modifications are available.\n\nThe original issue of this Airworthiness Directive became effective on 30 September 1980.\n\nAmendment 1 of this Airworthiness Directive became effective on 30 November 1980.","sortOrder":0}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":1928},"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":true,"description":"Amendment 2 significantly altered the regulatory approach from the original 1980 directive. The original likely required repetitive short-interval inspections throughout the aircraft's operational life. Amendment 2 shifts to a 'permanent fix' model—mandating one-time installation of improved parts (Piper Kits) to eliminate or reduce the need for ongoing repetitive inspections. This reflects a fundamental policy change regarding maintenance of ageing commuter-class aircraft, moving from continual monitoring to permanent modification."},"complexity_factors":["Conditional logic requiring different technical actions based on inspection results (crack found vs not found)","External technical references requiring specialized knowledge (Piper Service Bulletin 636A, specific kit numbers 764-028 and 763-917)","Serial number applicability matrix spanning multiple aircraft variants","Cross-reference to corresponding FAA AD 96-12-12","Technical aviation terminology (fuselage station numbering, 'time in service', bulkhead flange areas)"],"plain_english_summary":"This directive requires owners/operators of specified Piper PA‑31 series (Navajo, Chieftain, Mojave; certain serial ranges) to inspect the fuselage bulkhead at station 317.5 for cracks where the vertical fin attaches and to install a permanent reinforcement kit—Kit 764‑028 if cracks are found, Kit 763‑917 if not. Work must be done within 100 flight hours after 12 Sep 1996. It replaces recurring inspections with a one‑time structural fix to prevent tail failure."}},"importantCases":[],"_links":{"self":"/api/acts/ad-pa-31-94-amdt-2-fuselage-bulkhead-at-sta-317-5","history":"/api/acts/ad-pa-31-94-amdt-2-fuselage-bulkhead-at-sta-317-5/history","analysis":"/api/acts/ad-pa-31-94-amdt-2-fuselage-bulkhead-at-sta-317-5/analysis","conflicts":"/api/acts/ad-pa-31-94-amdt-2-fuselage-bulkhead-at-sta-317-5/conflicts","importantCases":"/api/acts/ad-pa-31-94-amdt-2-fuselage-bulkhead-at-sta-317-5/important-cases","documents":"/api/acts/ad-pa-31-94-amdt-2-fuselage-bulkhead-at-sta-317-5/documents"}}