{"id":"F2006B10618","name":"AD/HU 269/56 - Tailboom Support Strut End Fittings - Inspection and Modification","slug":"ad-hu-269-56-tailboom-support-strut-end-fittings-inspection-and-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":116499,"registerId":"commonwealth-F2006B10618-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/HU 269/56 - Tailboom Support Strut End Fittings - Inspection and Modification","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)  \nSchweizer (Hughes) 269 Series Helicopters\n\nAD/HU 269/56 Tailboom Support Strut End Fittings \\- Inspection and Modification\n\n  \n11/76\n\nApplicability: All models with tailboom support strut end fittings P/N 269A2015 or 269A2015-5. Document: Hughes SIN No. N-109.2.\n\nCompliance: For Step I \\- At each daily or overnight inspection after 6 October 1976.\n\nFor Step II \\- Within 50 hours time in service after 6 October 1976 and thereafter at intervals not exceeding 50 hours time in service.\n\nFor Step III \\- Within 500 hours time in service after 6 October 1976 or before 31 October 1977, whichever occurs first.\n\nNote: Step I of this Directive shall be entered on the maintenance release as maintenance required. The inspection may be performed by the pilot in command, in which case certification is not required. In all other cases certification may be made on the maintenance release. This inspection may also be performed and certified by any Licensed Aircraft Maintenance Engineer.","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, original airworthiness directive from 1976 addressing a specific mechanical defect. It has not expanded beyond its original scope of inspecting and modifying tailboom support strut fittings on Hughes 269 helicopters."},"complexity_factors":["Single, specific mechanical issue (tailboom fittings) affecting one aircraft series","Only 2 part numbers specified in applicability","Three clear sequential steps with unambiguous time triggers (daily/50hrs/500hrs)","No defined terms section or interpretation provisions","Single cross-reference to manufacturer document (Hughes SIN N-109.2)","Plain language instructions with minimal conditional logic","Total length: approximately 150 words"],"plain_english_summary":"This CASA Airworthiness Directive mandates inspection and permanent modification/replacement of tailboom support strut end fittings (P/N 269A2015 or 269A2015-5) on Schweizer/Hughes 269 helicopters because of risk of tailboom separation. It affects owners/operators, LAMEs who perform the work, and pilots (who must do daily/overnight visual checks).\n\nThe AD requires daily pilot checks, 50‑hour technician inspections, and a permanent fix within 500 flight hours or by 31 Oct 1977; the daily check must be recorded on the maintenance release."},"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":false,"description":"The directive stays narrowly targeted to helicopters fitted with the two specified part numbers and prescribes inspection and modification timing. There is no text indicating expansion or narrowing beyond that original applicability; substantive technical work is delegated to Hughes SIN N-109.2, but that delegation does not alter the AD's stated scope."},"complexity_factors":["Specific part-number applicability (P/N 269A2015, 269A2015-5) limits scope but requires positive identification (Applicability).","Three-tiered compliance timetable with different triggers and intervals (Step I: daily/overnight; Step II: within 50 hours then every 50 hours; Step III: within 500 hours or by 31 Oct 1977) increases scheduling complexity (Compliance: Steps I–III).","Dual compliance metrics (time-in-service hours and an absolute calendar deadline) create monitoring and record-keeping demands (Step II and Step III).","Certifying and performance options vary: pilot-in-command may perform Step I without certification; other inspections/modifications require entry on the maintenance release or a Licensed Aircraft Maintenance Engineer (Note).","Mandatory maintenance-release entry for Step I creates administrative burden and auditable records (Note).","Technical detail of the required modification is not in the AD text but is delegated to Hughes SIN N-109.2, forcing reliance on an external document for the substantive work (Document reference).","Potential operational impact from recurring 50‑hour inspections and the one‑off modification deadline affects aircraft availability and maintenance planning (Compliance: Steps II–III)."],"plain_english_summary":"This airworthiness directive requires operators of Schweizer (Hughes) 269-series helicopters fitted with tailboom support strut end fittings P/N 269A2015 or 269A2015-5 to follow a staged inspection and modification timetable: daily/overnight checks, recurring 50‑hour inspections, and a one‑off modification within 500 hours or by 31 October 1977. It points to Hughes Service Information N-109.2 for technical work. Operators bear the cost and scheduling burden; pilots may perform the daily check without certification while other work must be certified on the maintenance release or done by a Licensed Aircraft Maintenance Engineer."}},"importantCases":[],"_links":{"self":"/api/acts/ad-hu-269-56-tailboom-support-strut-end-fittings-inspection-and-modification","history":"/api/acts/ad-hu-269-56-tailboom-support-strut-end-fittings-inspection-and-modification/history","analysis":"/api/acts/ad-hu-269-56-tailboom-support-strut-end-fittings-inspection-and-modification/analysis","conflicts":"/api/acts/ad-hu-269-56-tailboom-support-strut-end-fittings-inspection-and-modification/conflicts","importantCases":"/api/acts/ad-hu-269-56-tailboom-support-strut-end-fittings-inspection-and-modification/important-cases","documents":"/api/acts/ad-hu-269-56-tailboom-support-strut-end-fittings-inspection-and-modification/documents"}}