{"id":"F2008L01836","name":"AD/PA-22/4 - Nose Wheel Mount - Stiffener Brace - CANCELLED","slug":"ad-pa-22-4-nose-wheel-mount-stiffener-brace-cancelled","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":74023,"registerId":"commonwealth-F2008L01836-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Piper PA-22 (Tri-Pacer and Colt) Series ","sectionType":"division","heading":"Piper PA-22 (Tri-Pacer and Colt) Series Aeroplanes","content":"### Piper PA-22 (Tri-Pacer and Colt) Series Aeroplanes\n\n| AD/PA-22/4 | Nose Wheel Mount - Stiffener Brace | 7/2008 |\n| ---------- | ---------------------------------- | ------ |\n\n| Requirement: | CANCELLED.                                                                                                                                                                                                                                                                                                                        |\n| ------------ | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n|              | This AD is cancelled on 3 July 2008.                                                                                                                                                                                                                                                                                              |\n| Background:  | This Directive specified a brace kit to be installed on the nose wheel mount in accordance with Piper SL No. 180. This Directive was not based on a USA Directive. As this Directive and SL No. 180 have been in force since 1951, all affected aircraft would have been modified long ago. Hence, this AD is no longer required. |\n\n![](image.001.png)\n\nDavid Villiers  \nDelegate of the Civil Aviation Safety Authority\n\n19 May 2008","sortOrder":0},{"sectionNumber":"AD/PA-22/4","sectionType":"part","heading":"AD/PA-22/4","content":"## AD/PA-22/4","sortOrder":1},{"sectionNumber":"Nose Wheel Mount - Stiffener Brace","sectionType":"part","heading":"Nose Wheel Mount - Stiffener Brace","content":"## Nose Wheel Mount - Stiffener Brace","sortOrder":2},{"sectionNumber":"7/2008","sectionType":"part","heading":"7/2008","content":"## 7/2008","sortOrder":3}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":2622},"content_quality":"ok","complexity_score":1,"scope_assessment":{"changed":false,"description":"This instrument serves a singular purpose: to cancel a previous Airworthiness Directive. It does not expand beyond this original intent; it simply revokes the 1951 requirement that mandated installation of a nose wheel stiffener brace, recognizing that compliance has been universal over the intervening decades."},"complexity_factors":["Extremely short length (less than one page)","No defined terms or interpretation section","No cross-references to other legislation","Simple, unconditional cancellation with no exceptions or conditions","Single operative provision (the cancellation itself)"],"plain_english_summary":"This document officially cancels an old aviation safety rule (called an **Airworthiness Directive**) that required owners of specific Piper aircraft (PA-22 Tri-Pacer and Colt models) to install a strengthening brace on the nose wheel mount.\n\n**Why it matters:**\n- The safety requirement was first introduced in 1951.\n- The aviation safety regulator (CASA) assumes all affected aircraft have already been modified over the past 57 years.\n- Because everyone has likely already complied, the rule is no longer needed and is formally cancelled as of 3 July 2008.\n\n**Who it affects:**\nOwners and operators of Piper PA-22 Tri-Pacer and Colt series aeroplanes, though practically speaking, no action is required as the directive is simply removed from the books."}},"importantCases":[],"_links":{"self":"/api/acts/ad-pa-22-4-nose-wheel-mount-stiffener-brace-cancelled","history":"/api/acts/ad-pa-22-4-nose-wheel-mount-stiffener-brace-cancelled/history","analysis":"/api/acts/ad-pa-22-4-nose-wheel-mount-stiffener-brace-cancelled/analysis","conflicts":"/api/acts/ad-pa-22-4-nose-wheel-mount-stiffener-brace-cancelled/conflicts","importantCases":"/api/acts/ad-pa-22-4-nose-wheel-mount-stiffener-brace-cancelled/important-cases","documents":"/api/acts/ad-pa-22-4-nose-wheel-mount-stiffener-brace-cancelled/documents"}}