{"id":"F2006B05688","name":"AD/PA-31/102 Amdt 2 - Flap Travel Restriction and Wing Flap Flexible Drive Shaft","slug":"ad-pa-31-102-amdt-2-flap-travel-restriction-and-wing-flap-flexible-drive-shaft","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":135462,"registerId":"commonwealth-F2006B05688-current","compilationNumber":null,"startDate":"2026-04-03","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/PA-31/102 Amdt 2 - Flap Travel Restriction and Wing Flap Flexible Drive Shaft","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-31/102\n\nAmdt 2\n\n  \n\nFlap Travel Restriction and Wing Flap Flexible Drive Shaft\n\n  \n6/82\n\nApplicability: All models PA-31T Cheyenne ) With S/Nos. referenced in All models PA-31T Cheyenne/ ) Piper SB No. 741 or with Cheyenne II ) S/Nos. referenced in All models PA31T1 Cheyenne I) subsequent issues of that SB.\n\nRequirement: Action in accordance with Piper SB No. 741.\n\nIn addition, when the maximum flap travel is restricted to 15\\`:\n\nAustralian Flight Manual landing distances shall be increased by 15% and approach speeds shall be increased by 5 knots.\n\nAustralian Flight Manuals are to be amended in accordance with the appropriate Department of Aviation approved flight manual amendment. Appropriate amendments will be available from Regional Offices.\n\nCompliance: In accordance with the Requirement document, with effect from 30 June 1982.\n\nBackground: Recent field reports have been received by the manufacturer indicating flap system malfunctions which were the result of failures of the wing flap flexible shaft assemblies. Amendment 2 introduces flight manual amendments to cover performance changes introduced by the Service Bulletin.","sortOrder":0}],"analysis":{"summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":true,"description":"Amends existing Airworthiness Directive to add mandatory flight manual performance changes when maximum flap travel is restricted to 15 degrees."},"complexity_factors":["References to external manufacturer service bulletin","Technical aviation terminology","Requires cross-referencing multiple documents"],"plain_english_summary":"This amendment to AD/PA-31/102 applies to specified Piper PA‑31 Cheyenne T-series aircraft and mandates compliance with Piper Service Bulletin No. 741 to address flap system failures. If the bulletin results in limiting flap travel to 15°, the aircraft’s Australian Flight Manual must be amended (using the Department‑approved form) to increase landing distances by 15% and approach speeds by 5 kt. It affects owners, pilots and maintenance organisations; compliance was required from 30 June 1982."},"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":1553},"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":true,"description":"Amendment 2 expanded the original directive's scope to include mandatory flight manual amendments and specific performance adjustments (15% increase in landing distance, 5 knot increase in approach speed) for aircraft where flap travel is restricted to 15 degrees. The original AD likely only required the mechanical inspection and repair per Service Bulletin 741 without these operational limitations."},"complexity_factors":["Relies on external technical document (Piper Service Bulletin No. 741) for actual implementation details","Applicability determined by specific aircraft serial numbers requiring cross-referencing","Conditional operational requirements (performance penalties) triggered only if flap travel is restricted","Technical aviation terminology (service bulletin, flexible drive shaft, serial numbers)"],"plain_english_summary":"This is a **safety directive** (an Airworthiness Directive) that requires owners and operators of specific Piper Cheyenne aircraft to inspect and repair potential defects in the wing flap system.\n\n**Who it affects:** Owners and operators of Piper PA-31T Cheyenne, Cheyenne II, and Cheyenne I aircraft with serial numbers listed in Piper Service Bulletin No. 741.\n\n**What must be done:**\n*   Follow the instructions in **Piper Service Bulletin No. 741** to address failures in the wing flap flexible drive shafts (components that help move the flaps).\n*   If the repairs result in the maximum flap movement being restricted to 15 degrees:\n    *   Increase calculated landing distances by **15%**\n    *   Increase approach speeds by **5 knots**\n    *   Update the aircraft's Australian Flight Manual with approved amendments available from Civil Aviation Safety Authority Regional Offices\n\n**Why it matters:** Broken flap drive shafts can cause the flaps to malfunction during landing, which is a serious safety risk. This directive prevents mechanical failures while ensuring pilots adjust their landing calculations if the flaps cannot extend to their full normal position."}},"importantCases":[],"_links":{"self":"/api/acts/ad-pa-31-102-amdt-2-flap-travel-restriction-and-wing-flap-flexible-drive-shaft","history":"/api/acts/ad-pa-31-102-amdt-2-flap-travel-restriction-and-wing-flap-flexible-drive-shaft/history","analysis":"/api/acts/ad-pa-31-102-amdt-2-flap-travel-restriction-and-wing-flap-flexible-drive-shaft/analysis","conflicts":"/api/acts/ad-pa-31-102-amdt-2-flap-travel-restriction-and-wing-flap-flexible-drive-shaft/conflicts","importantCases":"/api/acts/ad-pa-31-102-amdt-2-flap-travel-restriction-and-wing-flap-flexible-drive-shaft/important-cases","documents":"/api/acts/ad-pa-31-102-amdt-2-flap-travel-restriction-and-wing-flap-flexible-drive-shaft/documents"}}