{"id":"F2006B07136","name":"AD/STRIKEMASTER/4 - Port and Starboard Mainplane Spar Upper Attachment Lugs","slug":"ad-strikemaster-4-port-and-starboard-mainplane-spar-upper-attachment-lugs","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":48964,"registerId":"commonwealth-F2006B07136-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/STRIKEMASTER/4 - Port and Starboard Mainplane Spar Upper Attachment Lugs","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)  \nBAe (BAC 167) Strikemaster Series Aeroplanes\n\nAD/STRIKEMASTER/4 Port and Starboard Mainplane Spar\n\nUpper Attachment Lugs\n\n  \n13/96\n\nApplicability: BAC 167 all Mks:\n\npre mod 7061, which have achieved 15 F.I. or 1000 hours time in service, or post mod 7061, which have achieved 40 F.I.\n\nRequirement: Inspect the port and starboard mainplane spar upper attachment lugs for cracking in accordance with BAe CSI/STRIKEMASTER/50.\n\nNote: UK CAA MPD 1995-109 refers.\n\nCompliance: At the next 150 flying hour Service after 5 December 1996, thereafter at intervals not exceeding 150 hours time in service, and at each heavy landing or excess “g” loading after 07 November 1996.\n\nBackground: Cracking has occurred in the lugs which cannot be reliably detected in-situ using the existing ultrasonic techniques. It is therefore necessary to remove the wings and use the technique specified in the Requirement Document.","sortOrder":0}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":1528},"content_quality":"ok","complexity_score":4,"scope_assessment":{"changed":false,"description":"This Airworthiness Directive performs exactly its intended regulatory function—mandating specific safety inspections for a defined aircraft fleet. It has not expanded beyond its original technical safety purpose."},"complexity_factors":["Technical aviation terminology requiring specialist knowledge (e.g., 'F.I.' [Fatigue Index], 'mod 7061', 'mainplane spar')","Cross-references to external technical documents (BAe CSI/STRIKEMASTER/50, UK CAA MPD 1995-109) not included in the text","Conditional applicability logic based on aircraft modification history and accumulated flight hours","Specific compliance deadlines with multiple trigger conditions (calendar dates, flight hours, and event-based)","Removal of aircraft components required for compliance (wings), indicating high technical burden"],"plain_english_summary":"This directive requires mandatory inspections of the upper wing attachment lugs on BAC 167 Strikemaster jets because detected cracks could lead to catastrophic wing failure. It applies to owners/operators once aircraft reach the specified fatigue-index or flight-hour thresholds (including mod 7061) and following heavy landings or excessive G events.\n\nBecause reliable crack detection cannot be done with the wings fitted, operators must remove the wings and follow British Aerospace procedure CSI/STRIKEMASTER/50. Inspections are due initially and then every 150 flying hours."}},"importantCases":[],"_links":{"self":"/api/acts/ad-strikemaster-4-port-and-starboard-mainplane-spar-upper-attachment-lugs","history":"/api/acts/ad-strikemaster-4-port-and-starboard-mainplane-spar-upper-attachment-lugs/history","analysis":"/api/acts/ad-strikemaster-4-port-and-starboard-mainplane-spar-upper-attachment-lugs/analysis","conflicts":"/api/acts/ad-strikemaster-4-port-and-starboard-mainplane-spar-upper-attachment-lugs/conflicts","importantCases":"/api/acts/ad-strikemaster-4-port-and-starboard-mainplane-spar-upper-attachment-lugs/important-cases","documents":"/api/acts/ad-strikemaster-4-port-and-starboard-mainplane-spar-upper-attachment-lugs/documents"}}