{"id":"F2008L00769","name":"AD/B727/208 - Fuselage Crown Skin","slug":"ad-b727-208-fuselage-crown-skin","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":72827,"registerId":"commonwealth-F2008L00769-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Boeing 727 Series Aeroplanes","sectionType":"division","heading":"Boeing 727 Series Aeroplanes","content":"### Boeing 727 Series Aeroplanes\n\n| AD/B727/208 | Fuselage Crown Skin | 4/2008 |\n| ----------- | ------------------- | ------ |\n\n| Applicability: | All Model 727, 727C, 727-100, 727-100C, 727-200, and 727-200F series aircraft.                                                                                                                   |\n| -------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |\n| Requirement:   | Action in accordance with the technical requirements of FAA AD 2008-02-13 Amdt 39-15343.Note: Boeing Alert Service Bulletin 727-53A0224 original issue, or later FAA approved revision, refers.  |\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 cracks at multiple locations on certain areas of the crown skin. Such cracking, unless detected and corrected, could result in rapid decompression 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/B727/208","sectionType":"part","heading":"AD/B727/208","content":"## AD/B727/208","sortOrder":1},{"sectionNumber":"Fuselage Crown Skin","sectionType":"part","heading":"Fuselage Crown Skin","content":"## Fuselage Crown Skin","sortOrder":2},{"sectionNumber":"4/2008","sectionType":"part","heading":"4/2008","content":"## 4/2008","sortOrder":3}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a standard airworthiness directive adopting foreign safety requirements. It maintains its original narrow scope: addressing a specific structural defect in a specific aircraft type. No scope creep is evident."},"complexity_factors":["Very short document (under 300 words)","No defined terms section — relies entirely on external technical references","Single operative requirement: 'Action in accordance with FAA AD 2008-02-13'","No conditional logic or exceptions within the instrument itself","All technical complexity is outsourced to the referenced FAA directive and Boeing Service Bulletin"],"plain_english_summary":"Orders mandatory inspections and repairs of the fuselage crown skin on all Boeing 727 variants after cracks were found that could cause rapid decompression. It applies to owners, operators and maintenance organisations (including in Australia).\n\nRequires compliance with FAA AD 2008-02-13 and Boeing Alert Service Bulletin 727-53A0224 by the effective date (10 April 2008) to detect and repair fatigue cracks and prevent catastrophic cabin failure."},"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"},"flash_summary":{"complexity_score":5,"scope_assessment":{"changed":false,"description":"No substantive scope change evident in this instrument. It continues to apply to all listed Boeing 727 models and directs compliance with FAA AD 2008-02-13 and the Boeing service bulletin; the document records a revised effective date of 10 April 2008 but does not expand or narrow the listed applicability (Applicability; Requirement; Compliance)."},"complexity_factors":["Cross-reference to a foreign regulator's mandatory AD (FAA AD 2008-02-13) creates dependency on an external technical document (Requirement).","Applicability covers the entire Boeing 727 family (all Model 727, 727C, 727-100, 727-100C, 727-200, 727-200F), widening fleet impact and potential aggregate cost (Applicability).","Mandatory use of Boeing Alert Service Bulletin 727-53A0224 or a later FAA-approved revision creates technical specificity plus limited flexibility subject to FAA approval (Requirement).","Revised effective/compliance date (10 April 2008) affects scheduling and planning for inspections and repairs (Compliance).","High-safety consequence (risk of rapid decompression) raises enforcement and operational urgency (Background).","Regulatory delegation and coordination (signed by a CASA delegate) indicates domestic adoption of FAA technical requirements, which affects who decides acceptable revisions (signature/Requirement).","Compliance likely imposes direct inspection and repair costs on aircraft operators and may require parts or downtime; scale depends on findings and bulletin instructions (Applicability/Requirement)."],"plain_english_summary":"This Airworthiness Directive requires operators of all Boeing 727 variants to carry out the inspections and corrective actions specified in FAA AD 2008-02-13 (and Boeing Alert Service Bulletin 727-53A0224 or a later FAA-approved revision), with compliance keyed to an effective date of 10 April 2008. The FAA reported multiple cracks in the fuselage crown skin that, if not detected and corrected, could cause rapid decompression; operators must inspect and repair affected crown skin per the referenced technical instructions."}},"importantCases":[],"_links":{"self":"/api/acts/ad-b727-208-fuselage-crown-skin","history":"/api/acts/ad-b727-208-fuselage-crown-skin/history","analysis":"/api/acts/ad-b727-208-fuselage-crown-skin/analysis","conflicts":"/api/acts/ad-b727-208-fuselage-crown-skin/conflicts","importantCases":"/api/acts/ad-b727-208-fuselage-crown-skin/important-cases","documents":"/api/acts/ad-b727-208-fuselage-crown-skin/documents"}}