{"id":"F2008L04090","name":"AD/PA-25/21 Amdt 3 - Top Longeron - Modification - CANCELLED","slug":"ad-pa-25-21-amdt-3-top-longeron-modification-cancelled","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":75978,"registerId":"commonwealth-F2008L04090-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Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Piper PA-25 (Pawnee) Series Aeroplanes","sectionType":"division","heading":"Piper PA-25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-25/21 Amdt 3 | Top Longeron - Modification | 12/2008 |\n| ------------------ | --------------------------- | ------- |\n\n| Requirement: | CANCELLED.                                                                                                                                                                                                                                                                                |\n| ------------ | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n|              | This AD is cancelled on 20 November 2008.                                                                                                                                                                                                                                                 |\n| Background:  | This AD specified modification of the top longeron in accordance with Piper SBNo. 341 before reaching 1000 hours time in service. The AD was similar to USA AD 66-07-06 (superseded by 73-15-05). The modification was mandated in 1971 so all affected aircraft will have been modified. |\n\n![](image.001.png)\n\nDavid Villiers  \nDelegate of the Civil Aviation Safety Authority\n\n2 October 2008","sortOrder":0},{"sectionNumber":"AD/PA-25/21 Amdt 3","sectionType":"part","heading":"AD/PA-25/21 Amdt 3","content":"## AD/PA-25/21 Amdt 3","sortOrder":1},{"sectionNumber":"Top Longeron - Modification","sectionType":"part","heading":"Top Longeron - Modification","content":"## Top Longeron - 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":2428},"content_quality":"ok","complexity_score":1,"scope_assessment":{"changed":true,"description":"This amendment fundamentally alters the scope by completely removing the mandatory modification requirements of the original Airworthiness Directive. The instrument transforms from an active safety mandate regulating structural airworthiness into a cancellation notice with no ongoing compliance obligations."},"complexity_factors":["Single operative provision: cancellation of previous requirements","No defined terms or interpretation section","No conditional logic or exceptions","Minimal cross-referencing (only historical references to superseded bulletins for background)","Length: approximately 100 words of substantive content"],"plain_english_summary":"**What this does**\n\nThis document cancels a safety rule (called an Airworthiness Directive or AD) that previously required owners of **Piper PA-25 Pawnee** agricultural aircraft to modify a structural part of the plane called the **top longeron** (a metal beam running along the top of the fuselage). The original rule, introduced in 1971, required this modification to be done before the aircraft reached 1,000 hours of flight time.\n\n**Who it affects**\n\n- Owners and operators of Piper PA-25 Pawnee series aeroplanes\n- Maintenance organisations servicing these aircraft\n\n**Why it matters**\n\nBecause the modification was mandated back in 1971, every affected aircraft still flying in 2008 has already been modified. This cancellation removes a redundant compliance obligation, meaning owners no longer need to track or prove compliance with this specific rule. The cancellation took effect on **20 November 2008**."}},"importantCases":[],"_links":{"self":"/api/acts/ad-pa-25-21-amdt-3-top-longeron-modification-cancelled","history":"/api/acts/ad-pa-25-21-amdt-3-top-longeron-modification-cancelled/history","analysis":"/api/acts/ad-pa-25-21-amdt-3-top-longeron-modification-cancelled/analysis","conflicts":"/api/acts/ad-pa-25-21-amdt-3-top-longeron-modification-cancelled/conflicts","importantCases":"/api/acts/ad-pa-25-21-amdt-3-top-longeron-modification-cancelled/important-cases","documents":"/api/acts/ad-pa-25-21-amdt-3-top-longeron-modification-cancelled/documents"}}