{"id":"F2008L00736","name":"AD/CESSNA 525/7 - Structural Corrosion","slug":"ad-cessna-525-7-structural-corrosion","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":72778,"registerId":"commonwealth-F2008L00736-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Cessna 525 Series Aeroplanes","sectionType":"division","heading":"Cessna 525 Series Aeroplanes","content":"### Cessna 525 Series Aeroplanes\n\n| AD/CESSNA 525/7 | Structural Corrosion | 4/2008 |\n| --------------- | -------------------- | ------ |\n\n| Applicability: | Model 525 aircraft, serial numbers 0001 through 0637.Model 525A aircraft, serial numbers 0001 through 0347.Model 525B aircraft, serial numbers 0001 through 0152.                                                                                                  |\n| -------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |\n| Requirement:   | Action in accordance with the technical requirements of FAA AD 2008-03-10 Amdt 39-15360.                                                                                                                                                                           |\n| Compliance:    | As specified in the Requirement document, with a revised effective date of10 April 2008.                                                                                                                                                                           |\n|                | This Airworthiness Directive becomes effective on 10 April 2008.                                                                                                                                                                                                   |\n| Background:    | The FAA received a report of leakage of the cockpit mounted pilot relief tube, which caused corrosion of the aircraft structure. Undetected corrosion of the aircraft structure could cause structural degradation and lead to structural failure of the aircraft. |\n\n![](image.001.png)  \nDavid Villiers  \nDelegate of the Civil Aviation Safety Authority\n\n25 February 2008","sortOrder":0},{"sectionNumber":"AD/CESSNA 525/7","sectionType":"part","heading":"AD/CESSNA 525/7","content":"## AD/CESSNA 525/7","sortOrder":1},{"sectionNumber":"Structural Corrosion","sectionType":"part","heading":"Structural Corrosion","content":"## Structural Corrosion","sortOrder":2},{"sectionNumber":"4/2008","sectionType":"part","heading":"4/2008","content":"## 4/2008","sortOrder":3}],"analysis":{"flash_summary_failed":{"failed":true,"reason":"A positive credit balance is required for all requests, including BYOK, so fallback providers remain available. Add credits at https://vercel.com/d?to=%2F%5Bteam%5D%2F%7E%2Fai%3Fmodal%3Dtop-up to continue.","source":"analysis-cron"},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a standard Airworthiness Directive implementing a specific safety fix for a identified defect. It has not expanded beyond its original purpose of addressing the corrosion issue caused by the relief tube leakage."},"complexity_factors":["Very short document (under 300 words)","No defined terms section — uses standard aviation terminology only","Single operative requirement: 'Action in accordance with' external FAA document","No conditional logic, exceptions, or nested provisions","Simple applicability table with serial number ranges","Cross-reference to only one external document (FAA AD 2008-03-10)"],"plain_english_summary":"This CASA Airworthiness Directive requires owners/operators of certain Cessna CitationJet models (specified serial ranges of Model 525, 525A and 525B) to inspect for and repair corrosion caused by leakage from the pilot's relief (urine) tube. The corrosion can weaken structure and risk in-flight structural failure. Compliance follows FAA AD 2008-03-10 and was required by 10 April 2008."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The directive does not expand or narrow the set of affected aircraft beyond the stated model and serial-number ranges; it adopts the FAA's technical requirements and only revises the directive's effective date to 10 April 2008 (see 'Applicability', 'Requirement', 'Compliance')."},"complexity_factors":["Cross-reference to an external FAA AD (FAA AD 2008-03-10 Amdt 39-15360) requires operators to obtain and follow another jurisdiction's technical document.","Applicability limited by specific models and serial-number ranges (Model 525: 0001–0637; 525A: 0001–0347; 525B: 0001–0152), so compliance depends on accurate fleet records.","Technical nature of inspections/repairs may require specialised maintenance facilities, parts and certified personnel.","Safety-critical subject matter (structural corrosion) raises low tolerance for non-compliance and potential grounding of aircraft until rectified.","Revised effective date (10 April 2008) creates a fixed compliance start with limited transition time.","Delegated administrative decision (issued by CASA delegate) centralises enforcement and frames compliance responsibility on operators/owners."],"plain_english_summary":"This directive requires operators of Cessna 525, 525A and 525B aeroplanes (specified serial-number ranges) to carry out the inspection and rectification steps set out in FAA Airworthiness Directive 2008-03-10. It is intended to find and fix corrosion caused by a leaking cockpit pilot relief tube because undetected corrosion could degrade structure and lead to failure. The directive takes effect 10 April 2008 and imposes an immediate maintenance/compliance obligation on affected aircraft owners/operators."}},"importantCases":[],"_links":{"self":"/api/acts/ad-cessna-525-7-structural-corrosion","history":"/api/acts/ad-cessna-525-7-structural-corrosion/history","analysis":"/api/acts/ad-cessna-525-7-structural-corrosion/analysis","conflicts":"/api/acts/ad-cessna-525-7-structural-corrosion/conflicts","importantCases":"/api/acts/ad-cessna-525-7-structural-corrosion/important-cases","documents":"/api/acts/ad-cessna-525-7-structural-corrosion/documents"}}