{"id":"F2006B05526","name":"AD/PA-24/28 Amdt 1 - Normal Operating and Never Exceed Speed Limitations - Reduction","slug":"ad-pa-24-28-amdt-1-normal-operating-and-never-exceed-speed-limitations-reduction","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":46411,"registerId":"commonwealth-F2006B05526-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/PA-24/28 Amdt 1 - Normal Operating and Never Exceed Speed Limitations - Reduction","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-24 (Comanche) Series Aeroplanes\n\nAD/PA-24/28\n\nAmdt 1\n\n  \n\nNormal Operating and Never Exceed Speed Limitations - Reduction\n\n  \n2/75\n\nApplicability: Models PA24, PA24-250 and PA24-260. Requirement: Reduce Vno and Vne speeds as follows:\n\n    Aircraft not incorporating Rudder Balance Weight Installations Kit, Piper P/N 760705:\n\nPA-24 reduce Vne to 160 kts. IAS; PA24-250 and PA24-260 reduce Vno to 147 Kts. IAS and Vne to 165 Kts. IAS.\n\n    2. Aircraft incorporating Rudder Balance Weight Installation Kit, Piper P/N 760705:\n\nPA-24 reduce Vne to 172 kts. IAS; PA24-250 and PA24-260 reduce Vno to 158 kts. IAS and Vne to 179 kts. IAS.\n\nNote 1: For PA24-250 and PA24-260 type aeroplanes incorporating Stabilator Piper Service Kit No. 760747 in addition to Rudder Piper Service Kit No. 760705 \\- Vne may be increased to 201 knots.\n\nNote 2: This Directive reflects the contents of FAA AD Piper 72-22-5 Amdt. 39-1545 as amended by Amdt. 39-2052.\n\nCompliance: For Para. 1 \\- Before 10 November 1972.\n\nFor Para. 2 \\- Within 30 days after 10 November 1972.","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a specific, targeted safety directive for three aircraft models. It has not expanded beyond its original purpose of imposing speed limitations on these specific Piper Comanche variants."},"complexity_factors":["Very short document (under 300 words)","Only 3 defined aircraft models affected","Simple conditional structure based on one modification (rudder balance weight kit)","No cross-references to other legislation beyond noting the originating FAA directive","Clear, specific numerical requirements with minimal legal drafting","Single compliance deadline structure (already historical/past)"],"plain_english_summary":"Australia’s Civil Aviation Safety Authority requires owners/operators of Piper PA-24, PA-24-250 and PA-24-260 Comanches to permanently lower the published Vno and Vne speeds (with specific limits varying if a rudder balance weight kit is fitted). Issued after an FAA safety finding that the original limits were unsafe, the AD mandates updating the flight manual and compliance by the 1972 deadlines — effectively forcing these aircraft to be flown more slowly than originally stated."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"Scope has not changed from the instrument text provided: it remains limited to the specified PA‑24 series models and to altering Vno/Vne according to kit fitment, with the stated compliance deadlines and the optional stabilator exception."},"complexity_factors":["Multiple aircraft models covered (PA‑24, PA24‑250, PA24‑260) requiring model‑specific limits","Different speed limits conditional on equipment fitment (Rudder Balance Weight Kit P/N 760705; optional Stabilator Kit P/N 760747)","Two compliance timeframes (before 10 Nov 1972 for one set; within 30 days after 10 Nov 1972 for the other)","Operational and maintenance consequences (placarding, pilot procedures, possible retrofits) for owners/operators","Cross‑reference to FAA AD as source of the requirement, implying alignment with foreign airworthiness findings"],"plain_english_summary":"This airworthiness directive reduces the indicated maximum normal (Vno) and never‑exceed (Vne) airspeeds for Piper PA‑24, PA24‑250 and PA24‑260 aeroplanes. The exact new limits depend on whether the Rudder Balance Weight Kit (P/N 760705) is fitted, and PA24‑250/‑260 aeroplanes with an additional Stabilator Kit (P/N 760747) may have a higher Vne (201 kt). It applies to aircraft owners, operators and maintenance organisations, who must meet retrofit, placarding or operating‑limit changes by the stated deadlines, altering pilot speed management and maintenance choices."}},"importantCases":[],"_links":{"self":"/api/acts/ad-pa-24-28-amdt-1-normal-operating-and-never-exceed-speed-limitations-reduction","history":"/api/acts/ad-pa-24-28-amdt-1-normal-operating-and-never-exceed-speed-limitations-reduction/history","analysis":"/api/acts/ad-pa-24-28-amdt-1-normal-operating-and-never-exceed-speed-limitations-reduction/analysis","conflicts":"/api/acts/ad-pa-24-28-amdt-1-normal-operating-and-never-exceed-speed-limitations-reduction/conflicts","importantCases":"/api/acts/ad-pa-24-28-amdt-1-normal-operating-and-never-exceed-speed-limitations-reduction/important-cases","documents":"/api/acts/ad-pa-24-28-amdt-1-normal-operating-and-never-exceed-speed-limitations-reduction/documents"}}