{"id":"F2006B03257","name":"AD/B747/8 - Fuel System - Inspection","slug":"ad-b747-8-fuel-system-inspection","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":42681,"registerId":"commonwealth-F2006B03257-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/B747/8 - Fuel System - 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 747 Series Aeroplanes\n\nAD/B747/8 Fuel System \\- Inspection 8/76\n\nApplicability: All models.\n\nRequirement: 1. Inspect the dry bay areas between the outboard reserve tanks, wing STA 1280, and the surge tanks, wing STA 1485, for evidence of fuel leaks, unless already accomplished per Boeing SL 747-SL-28-3 dated 11 June 1976. Verify the existence of a clear drain path through each vent/drain hole and stringer limber hole to prevent accumulation of fluids. Clean all dry bay access door clamp rings and wing mating surfaces. Tighten all attach bolts to 35-40 inch lbs.\n\n    2. Unless already accomplished per Boeing SL 747-SL-28-4 dated 21 June 1976, inspect all engine struts for evidence of fuel leakage. Inspections shall be accomplished by gaining access on the left side of each nacelle strut through the B, C and D panels with prefix nos. 452, 462, 472 or 482.\n\n    3. Unless already accomplished per Boeing SL 747-SL-28-5 dated 21 June 1976, inspect overwing fuel filler caps for approved part numbers IO-3297-119 “GAAB P/N 38222-2\" or IO-3297-147 “GAAB P/N 38222-3\" and determine that non- metallic lanyards are installed; or\n\nFAA AD 76-14-06.\n\nCompliance: Before 20 July 1976.","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This is a discrete, time-bound safety directive issued in 1976. It has not grown beyond its original purpose of addressing specific fuel system inspection requirements for Boeing 747 aircraft. The scope remains exactly as intended: three specific inspections with a hard deadline."},"complexity_factors":["Short, single-purpose directive with only 3 inspection requirements","Limited cross-referencing (only references 3 Boeing service bulletins and one FAA AD)","Specific technical measurements provided (35-40 inch lbs torque, specific part numbers, wing station references)","Simple conditional logic (\"unless already accomplished per...\")","No defined terms section – assumes aviation technical knowledge","Single compliance date with no phased implementation"],"plain_english_summary":"This mandatory Airworthiness Directive orders all Boeing 747 operators in Australia to inspect critical areas for fuel leaks—dry bay spaces in wings, engine struts, and overwing fuel filler caps—and to correct defects or install approved parts. It targets airlines, cargo operators and private owners because fuel accumulation presents a serious fire hazard. Compliance is compulsory and urgent; equivalent prior work per specified Boeing service bulletins may be accepted."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The directive applies to all Boeing 747 models and mandates inspections and corrective actions described in the instrument. There is no indication in the text that the applicability or substantive scope was altered from the instrument's stated requirements."},"complexity_factors":["Technical nature of tasks (inspection of dry bays, vent/drain paths, nacelle struts, filler caps) requiring maintenance skill and access to specific panels","Cross-references to Boeing service letters and an FAA AD for prior compliance paths (requires checking conformity with external documents)","Concrete hardware specifications (specific bolt torque 35–40 inch‑lbs and specific filler cap part numbers) that demand precision","Operational scheduling constraint (single compliance deadline) imposing programmatic burden on operators","Applicability to all models increases scope of fleet coordination but keeps rule uniform"],"plain_english_summary":"This airworthiness directive requires operators and maintenance organisations of all Boeing 747 models to inspect fuel-system areas for leaks, verify and clear vent/drain paths, clean mating surfaces, tighten specified bolts, inspect engine struts, and check overwing filler caps and lanyards. CASA issues the directive and sets the compliance deadline; operators pay for inspections, repairs and any part replacements. Mechanically, it forces specific inspection, cleaning, verification and torque actions intended to prevent fuel accumulation and leakage."}},"importantCases":[],"_links":{"self":"/api/acts/ad-b747-8-fuel-system-inspection","history":"/api/acts/ad-b747-8-fuel-system-inspection/history","analysis":"/api/acts/ad-b747-8-fuel-system-inspection/analysis","conflicts":"/api/acts/ad-b747-8-fuel-system-inspection/conflicts","importantCases":"/api/acts/ad-b747-8-fuel-system-inspection/important-cases","documents":"/api/acts/ad-b747-8-fuel-system-inspection/documents"}}