{"id":"F2006B02763","name":"AD/B727/60 - Fin Front Spar Forging - Inspection","slug":"ad-b727-60-fin-front-spar-forging-inspection","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":42105,"registerId":"commonwealth-F2006B02763-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/B727/60 - Fin Front Spar Forging - Inspection","content":"COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 \\- 105 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n![](image.001.png)  \nBoeing 727 Series Aeroplanes\n\nAD/B727/60 Fin Front Spar Forging \\- Inspection 10/68\n\nApplicability: All models.\n\nRequirement: Inspect the outboard flanges of the fin front spar forging P/N 65-18913, as follows:\n\n    Inspect the top and bottom flanges aft to Body Station 1203 visually or using an approved radiographic technique.\n\n    2. Visually inspect the top flange from Body Station 1203 to 1223 by removing access panels 9523 and 9524.\n\n    3. Visually inspect the bottom flange from Body Station 1203 to 1248. Inspection may be made from the aft stair well using a 90° borescope. On the right hand side the removal of the de-ice duct is necessary.\n\n    4. Visually inspect the top flange from Body Station 1223 aft to the splice at the end of the fitting. Access may be gained through lightening holes in the fitting after removing access panel 9501.\n\n    5. Visually inspect the bottom flange from Body Station 1248 aft to the splice at the end of the fitting. Access may be gained through lightening holes in the fitting after removing access panel 9501.\n\n    6. Inspect the splice joints visually or using an approved radiographic technique. Compliance: Forthwith.","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, targeted safety directive focused on a specific known defect in a specific aircraft type. It has not expanded beyond its original purpose of mandating inspection of the Boeing 727 fin front spar forging."},"complexity_factors":["Single, specific technical subject matter (one aircraft part on one aircraft series)","Only 6 numbered inspection requirements with clear procedural steps","No defined terms section or interpretation clauses","No cross-references to other legislation or regulations beyond the enabling citation (Civil Aviation Regulations 1998, Part 39)","Simple unconditional compliance requirement ('Forthwith') with no exceptions, exemptions, or conditional logic","Length: approximately 200 words of substantive content","Technical but not legally complex — written for aircraft maintenance engineers rather than lawyers"],"plain_english_summary":"Owners and operators of Boeing 727s in Australia must immediately inspect the fin front spar forging (a critical vertical‑tail structural part). The AD requires close visual or X‑ray/borescope inspection access—removing panels or ducts as needed—to detect cracking or failure.\n\nThis retroactive, mandatory safety order aims to prevent catastrophic tail loss from spar failure; compliance is required forthwith."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The directive applies to all Boeing 727 models and mandates immediate inspection of fin front spar forging P/N 65-18913; the text contains no indication that the instrument changes the original scope or target beyond this specified applicability."},"complexity_factors":["Technical specificity: inspection locations defined by multiple Body Station ranges (e.g. BS 1203–1223, 1223 aft, 1248 aft) requiring precise part identification.","Multiple permitted inspection methods (visual, approved radiographic technique, 90° borescope) requiring different equipment, approvals and skills.","Physical access actions: removal of access panels (9523, 9524, 9501), possible de‑ice duct removal, and use of lightening holes increases labour and time.","Immediate compliance timing ('Forthwith') creates scheduling and operational disruption risk for operators.","Applicability to all Boeing 727 models broadens operational impact and fleet coordination requirements.","Part-specific requirement (P/N 65-18913) demands accurate parts tracking and maintenance records."],"plain_english_summary":"This airworthiness directive requires immediate inspection of specified outboard flanges and splice joints on the fin front spar forging (P/N 65‑18913) of all Boeing 727 series aeroplanes, using visual checks, approved radiography, or a 90° borescope as set out. It affects operators and maintenance organisations for all 727 models, who must perform the checks forthwith and may need to remove access panels, the de‑ice duct, or use lightening‑hole access to comply."}},"importantCases":[],"_links":{"self":"/api/acts/ad-b727-60-fin-front-spar-forging-inspection","history":"/api/acts/ad-b727-60-fin-front-spar-forging-inspection/history","analysis":"/api/acts/ad-b727-60-fin-front-spar-forging-inspection/analysis","conflicts":"/api/acts/ad-b727-60-fin-front-spar-forging-inspection/conflicts","importantCases":"/api/acts/ad-b727-60-fin-front-spar-forging-inspection/important-cases","documents":"/api/acts/ad-b727-60-fin-front-spar-forging-inspection/documents"}}