{"id":"F2006L01665","name":"AD/PA-25/17 Amdt 5 - Fuselage Structure - Corrosion","slug":"ad-pa-25-17-amdt-5-fuselage-structure-corrosion","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":59389,"registerId":"commonwealth-F2006L01665-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","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-25/17 Amdt 5 | Fuselage Structure - Corrosion | 7/2006 |\n| ------------------ | ------------------------------ | ------ |\n\n| Applicability: | All models.                                                                             |\n| -------------- | --------------------------------------------------------------------------------------- |\n| Requirement:   | 1. Radiographically inspect the following tubes in the fuselage for internal corrosion: |\n|                | (a) PA-25 tubes numbers 62, 89, 2 and 129 shown in Piper drawing 61001.                 |\n|                |                                                                                         |\n\n|             | (b) PA-25-235 and 260 tube numbers 22, 23 and 26 shown in Piper drawing 64001.                                                                                                                        |\n| ----------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n|             |                                                                                                                                                                                                       |\n|             | Note: Radiographic technique DCA NDI/R/5 is an approved inspection method.                                                                                                                            |\n| Compliance: | For para. 1(a) - Within 5 years from date of manufacture and thereafter at intervals not exceeding 6 years.                                                                                           |\n|             | For para. 1(b) - Within 5 years from date of manufacture or repair.                                                                                                                                   |\n|             | This Amendment becomes effective on 6 July 2006.                                                                                                                                                      |\n| Background: | This directive is intended to detect cracking in some of the main structural elements of the fuselage.Amendment 5 adds drawings showing the location of the tubes to be inspected to improve clarity. |\n\n![](image.003.png)  \nDavid Villiers  \nDelegate of the Civil Aviation Safety Authority\n\n25 May 2006","sortOrder":0},{"sectionNumber":"AD/PA-25/17 Amdt 5","sectionType":"part","heading":"AD/PA-25/17 Amdt 5","content":"## AD/PA-25/17 Amdt 5","sortOrder":1},{"sectionNumber":"Fuselage Structure - Corrosion","sectionType":"part","heading":"Fuselage Structure - Corrosion","content":"## Fuselage Structure - Corrosion","sortOrder":2},{"sectionNumber":"7/2006","sectionType":"part","heading":"7/2006","content":"## 7/2006","sortOrder":3}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This amendment remains tightly focused on its original purpose of detecting corrosion in specific fuselage tubes of the PA-25 series. Amendment 5 is a minor technical update that adds drawing references to improve clarity without expanding the scope of affected aircraft or inspection requirements."},"complexity_factors":["Very short document (approximately 200 words of substantive content)","Only 2 main compliance pathways with clear model distinctions","Minimal defined terms (only standard aviation references like 'fuselage' and 'radiographic')","No cross-references to other legislation or regulations","Simple conditional structure: 'if model X, do Y; if model Z, do W'","Single amendment purpose (adding drawing references for clarity)"],"plain_english_summary":"This AD requires owners/operators of Piper PA‑25 Pawnee aircraft to X‑ray specific internal fuselage tubes identified in Piper drawings to detect hidden corrosion. \n\nThe inspections (and periodic rechecks) prevent cracking and potential catastrophic structural failure; the amendment adds clearer diagrams to help mechanics locate the tubes. Effective 6 July 2006."},"flash_summary_failed":{"failed":true,"reason":"Unauthenticated. Configure AI_GATEWAY_API_KEY or use a provider module. Learn more: https://ai-sdk.dev/unauthenticated-ai-gateway","source":"analysis-cron"},"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":false,"description":"Amendment 5 adds drawings showing the locations of the tubes to be inspected to improve clarity but does not alter the inspection requirement itself (Background). The directive’s mechanical scope—radiographic inspection of the specified tube numbers with the stated compliance intervals—remains unchanged."},"complexity_factors":["Technical inspection method required (radiography) and a specific approved technique referenced (DCA NDI/R/5).","Different sets of tube numbers for standard PA‑25 versus PA‑25‑235/260 models (drawings 61001 and 64001 referenced).","Two distinct compliance timings: para 1(a) requires initial within 5 years and repeats every 6 years; para 1(b) requires within 5 years from manufacture or repair.","Dependence on external documents (Piper drawings 61001 and 64001) to locate which components to inspect.","Operational impact on owners/operators: need to schedule inspections, obtain radiographic services, and accommodate aircraft downtime."],"plain_english_summary":"This airworthiness directive requires radiographic inspection of specific fuselage tubes on all Piper PA‑25 (Pawnee) series aeroplanes to detect internal corrosion. It names the tube numbers for standard PA‑25 and for PA‑25‑235/260 variants, and specifies an approved radiographic technique. Inspections must occur within five years of manufacture (or of repair for some tubes) and, for one group of tubes, repeat at intervals not exceeding six years. Owners/operators must arrange and pay for the inspections and aircraft downtime."}},"importantCases":[],"_links":{"self":"/api/acts/ad-pa-25-17-amdt-5-fuselage-structure-corrosion","history":"/api/acts/ad-pa-25-17-amdt-5-fuselage-structure-corrosion/history","analysis":"/api/acts/ad-pa-25-17-amdt-5-fuselage-structure-corrosion/analysis","conflicts":"/api/acts/ad-pa-25-17-amdt-5-fuselage-structure-corrosion/conflicts","importantCases":"/api/acts/ad-pa-25-17-amdt-5-fuselage-structure-corrosion/important-cases","documents":"/api/acts/ad-pa-25-17-amdt-5-fuselage-structure-corrosion/documents"}}