{"id":"F2006B10648","name":"AD/HU 269/89 - Droop Stop Nut","slug":"ad-hu-269-89-droop-stop-nut","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":116560,"registerId":"commonwealth-F2006B10648-current","compilationNumber":null,"startDate":"2026-04-03","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/HU 269/89 - Droop Stop Nut","content":"COMMONWEALTH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 269/89 Droop Stop Nut 2/88 DM\n\nApplicability: All Model 269 series Helicopters.\n\nRequirement: 1. Carry out a visual inspection of the droop stop nut (P/N 269A1340) for indications of cracking in accordance with Part I of Schweizer Service Information Notice No. N-213.\n\n2. Carry out a dye penetrant inspection of the droop stop nut (P/N 269A1340) for cracking in accordance with Part II of Schweizer SIN No. N-213.\n\nCompliance: a. As detailed in Requirement 1 not later than at each Daily Inspection after 17 December 1987, until Requirement 2 is accomplished.\n\nNote: The visual inspection may be accomplished by the pilot in command, in which case the precise AD reference shall be entered in a certification made on the Maintenance Release coincident with that for the Daily Inspection.\n\nb. As detailed in Requirement 2 within 100 hours time in service after 31 December 1987 or prior to 31 March 1988, whichever occurs first.\n\nc. As detailed in Requirement 2 prior to the installation of droop stop nuts held in spares inventory at 29 September 1987.\n\nBackground: Reports received by the manufacturer indicate the possibility of cracking and failure of the droop stop nut. A one-time dye penetrant inspection of the subject nut constitutes terminating action.","sortOrder":0}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":2471},"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"The directive remains precisely targeted at the original safety defect concerning droop stop nut cracking in Schweizer 269 helicopters, with no expansion to other aircraft types or unrelated systems."},"complexity_factors":["References to external manufacturer documentation (Schweizer Service Information Notice N-213) without reproducing the technical procedures","Multiple compliance deadlines requiring calculation (calendar date vs. flight hours 'whichever occurs first')","Conditional exception allowing pilot-performed inspections with specific documentation requirements","Inventory compliance requirement applying to spare parts held at a specific historical date"],"plain_english_summary":"This Airworthiness Directive requires owners/operators of Schweizer (Hughes) 269 helicopters to guard against cracking of the droop stop nut (P/N 269A1340), which can fail and endanger flight. Conduct daily visual checks for cracks (pilots may perform these but must log the AD reference) until a dye‑penetrant inspection is done per Schweizer Service Information N‑213.\n\nComplete the dye‑penetrant inspection within 100 flight hours after 31 Dec 1987 or by 31 Mar 1988 (whichever is first) and before installing any affected spares; that inspection terminates daily checks."}},"importantCases":[],"_links":{"self":"/api/acts/ad-hu-269-89-droop-stop-nut","history":"/api/acts/ad-hu-269-89-droop-stop-nut/history","analysis":"/api/acts/ad-hu-269-89-droop-stop-nut/analysis","conflicts":"/api/acts/ad-hu-269-89-droop-stop-nut/conflicts","importantCases":"/api/acts/ad-hu-269-89-droop-stop-nut/important-cases","documents":"/api/acts/ad-hu-269-89-droop-stop-nut/documents"}}