{"id":"F2006B05554","name":"AD/PA-25/16 Amdt 2 - Tail Wheel Spring Bolts - Replacement","slug":"ad-pa-25-16-amdt-2-tail-wheel-spring-bolts-replacement","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":46521,"registerId":"commonwealth-F2006B05554-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/PA-25/16 Amdt 2 - Tail Wheel Spring Bolts - Replacement","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-25 (Pawnee) Series Aeroplanes\n\nAD/PA-25/16\n\nAmdt 2\n\n  \nTail Wheel Spring Bolts \\- Replacement 9/70\n\nApplicability: Model PA-25 and model PA-25-235 and variants of that model not fitted with two bolts retaining the tail wheel assembly to the spring or not modified to an alternative scheme approved by the Secretary.\n\nRequirement: 1. Replace the AN6-25A bolt securing the front of the spring with a new AN6-25A bolt.\n\n2. Replace the AN7-21A bolt securing the tail wheel assembly to the spring with a new AN7-21A bolt.\n\nNote: Replacement of the AN6 bolt at the front of the spring by an AN7 bolt and the AN7 bolt securing the tail wheel assembly by an AN8 bolt constitutes an alternative approved scheme.\n\nCompliance: At intervals not exceeding 35 hours time in service after 1 Sept. 1971.","sortOrder":0}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":2358},"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"As Amendment 2 of a 1970 directive, this maintains the original narrow scope of tail wheel hardware replacement for PA-25 aircraft; no expansion of affected aircraft types, substantive requirements, or operational scenarios is evident."},"complexity_factors":["Document length under 150 words with no cross-references to other legislative provisions","Only two substantive requirements (replacement of specified bolts)","Single negative applicability condition (aircraft without dual-bolt system or approved alternative)","Simple temporal compliance trigger (35 hours time in service)"],"plain_english_summary":"This Airworthiness Directive requires owners/operators of Piper PA‑25/PA‑25‑235 Pawnee aircraft (unless already fitted with two retaining bolts or modified under an approved alternative) to replace the two bolts retaining the tail‑wheel spring assembly with new bolts of the same specification on a recurring 35‑flight‑hour interval (from 1 Sept 1971). It’s intended to prevent tail‑wheel detachment and loss of control during landing/taxiing, especially from rough fields."}},"importantCases":[],"_links":{"self":"/api/acts/ad-pa-25-16-amdt-2-tail-wheel-spring-bolts-replacement","history":"/api/acts/ad-pa-25-16-amdt-2-tail-wheel-spring-bolts-replacement/history","analysis":"/api/acts/ad-pa-25-16-amdt-2-tail-wheel-spring-bolts-replacement/analysis","conflicts":"/api/acts/ad-pa-25-16-amdt-2-tail-wheel-spring-bolts-replacement/conflicts","importantCases":"/api/acts/ad-pa-25-16-amdt-2-tail-wheel-spring-bolts-replacement/important-cases","documents":"/api/acts/ad-pa-25-16-amdt-2-tail-wheel-spring-bolts-replacement/documents"}}