{"id":"F2008L04119","name":"AD/PA-25/25 - Fuel Cell Vent - Modification - CANCELLED","slug":"ad-pa-25-25-fuel-cell-vent-modification-cancelled","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":76036,"registerId":"commonwealth-F2008L04119-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Piper PA-25 (Pawnee) Series Aeroplanes","sectionType":"division","heading":"Piper PA-25 (Pawnee) Series Aeroplanes","content":"### Piper PA-25 (Pawnee) Series Aeroplanes\n\n| AD/PA-25/25 | Fuel Cell Vent - Modification | 12/2008 |\n| ----------- | ----------------------------- | ------- |\n\n| Requirement: | CANCELLED.                                                                                                                                                                                                                              |\n| ------------ | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n|              | This AD is cancelled on 20 November 2008.                                                                                                                                                                                               |\n| Background:  | This unique Australian AD specified modification of the vent in rubber-lined fuel cells in accordance with Piper SB No. 247. Compliance was required within 100 hours time in service after January 1968. The AD is no longer required. |\n\n![](image.001.png)\n\nCharles Lenarcic  \nDelegate of the Civil Aviation Safety Authority\n\n9 October 2008","sortOrder":0},{"sectionNumber":"AD/PA-25/25","sectionType":"part","heading":"AD/PA-25/25","content":"## AD/PA-25/25","sortOrder":1},{"sectionNumber":"Fuel Cell Vent - Modification","sectionType":"part","heading":"Fuel Cell Vent - Modification","content":"## Fuel Cell Vent - Modification","sortOrder":2},{"sectionNumber":"12/2008","sectionType":"part","heading":"12/2008","content":"## 12/2008","sortOrder":3}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":1889},"content_quality":"ok","complexity_score":1,"scope_assessment":{"changed":false,"description":"This instrument terminates an existing requirement rather than expanding scope. It simply cancels a previous Airworthiness Directive that is no longer required for aviation safety."},"complexity_factors":["Single operative provision consisting of one sentence ('This AD is cancelled on 20 November 2008')","Zero defined terms","Zero cross-references to other legislative provisions","No conditional logic or exceptions","Document length is approximately 50 words of operative text"],"plain_english_summary":"**What this does:** This document officially cancels a previous safety rule (Airworthiness Directive) that required owners of Piper PA-25 Pawnee aircraft to modify the fuel tank vents.\n\n**Who it affects:** Owners and operators of Piper PA-25 Pawnee series aeroplanes.\n\n**What the old rule required:** The previous directive (issued in 1968) required modifications to the vents in rubber-lined fuel cells following a specific service bulletin from the manufacturer (Piper SB No. 247). Aircraft had to comply within 100 hours of flying time after January 1968.\n\n**Why it matters:** The fuel vent modification is no longer considered necessary for airworthiness (aircraft safety), so this cancellation removes an obsolete maintenance requirement. Aircraft owners no longer need to track or comply with this specific directive."}},"importantCases":[],"_links":{"self":"/api/acts/ad-pa-25-25-fuel-cell-vent-modification-cancelled","history":"/api/acts/ad-pa-25-25-fuel-cell-vent-modification-cancelled/history","analysis":"/api/acts/ad-pa-25-25-fuel-cell-vent-modification-cancelled/analysis","conflicts":"/api/acts/ad-pa-25-25-fuel-cell-vent-modification-cancelled/conflicts","importantCases":"/api/acts/ad-pa-25-25-fuel-cell-vent-modification-cancelled/important-cases","documents":"/api/acts/ad-pa-25-25-fuel-cell-vent-modification-cancelled/documents"}}