{"id":"F2006B10756","name":"AD/HU 369/91 - \"Flight Trials\" Hardpoints","slug":"ad-hu-369-91-flight-trials-hardpoints","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":56204,"registerId":"commonwealth-F2006B10756-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/HU 369/91 - \"Flight Trials\" Hardpoints","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)  \nMcDonnell Douglas (Hughes) and Kawasaki 369 Series Helicopters\n\nAD/HU 369/91 \"Flight Trials\" Hardpoints 8/96 DM\n\nApplicability: Models 369D, 369E, 369F, 369FF, and 500N that have been modified using Flight Trials Helicopter Inc. hardpoint assemblies in accordance with either United States FAA:\n\n    Supplementary Type Certificate SH6080NM approved by this Authority, or\n\n    b. Form 337 \"Major Repair and Alteration\", prior to import into Australia. Requirement: Remove from service any Flight Trials Helicopter Inc. hardpoints not marked with:\n\n    a Part Number (P/N) FTH 105 LH Mod 1 for the port side and FTH 105 RH Mod 1 for the starboard side; and\n\n    b. a Serial Number (S/N).\n\nNote 1. Access may be gained by removing the NAS 1351-3 cap screw that secures the hardpoint to the P/N 369H2521-1 and -2 jacking fittings, and slipping the hardpoint assembly out of the step mount.\n\nNote 2. FAA AD 96-08-03 refers.\n\nCompliance: Before further flight after 22 May 1996.\n\nBackground: This Directive is raised to prevent failure of a hardpoint assembly with separation from the helicopter, and subsequent possible contact with the fuselage or rotor system.","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, targeted safety directive addressing a specific mechanical defect in specific helicopter models. It has not expanded beyond its original purpose of mandating inspection and removal of potentially defective hardpoint assemblies."},"complexity_factors":["Single, specific safety requirement with clear binary condition (marked vs unmarked)","Limited applicability to 5 specific helicopter models with specific modification history","Only 2 defined identifiers required (part numbers and serial numbers)","No nested exceptions or conditional logic — straightforward compliance deadline","Short document (approximately 200 words) with minimal cross-referencing (only one reference to related FAA directive)"],"plain_english_summary":"This CASA Airworthiness Directive applies to McDonnell Douglas (Hughes) and Kawasaki 369/500N helicopters fitted with Flight Trials Helicopter Inc. hardpoint assemblies. Owners/operators must inspect those hardpoints immediately; if they lack the markings \"FTH 105 LH Mod 1\" or \"FTH 105 RH Mod 1\" and a serial number, they must be removed from service before flight after 22 May 1996. The directive addresses risk of hardpoint failure that could lead to impact with the helicopter or rotor."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The text gives no indication that the Directive departs from its stated purpose. It targets specified 369/500N models modified with Flight Trials hardpoints and mandates removal of assemblies lacking the named part numbers and serial numbers to prevent failure (Applicability; Requirement; Background)."},"complexity_factors":["Narrow technical scope: applies only to listed helicopter models modified with Flight Trials hardpoint assemblies (Applicability).","Marking-based compliance test: requires specific P/Ns for port and starboard and a S/N to remain in service (Requirement).","Deadline pressure: removal must be completed before further flight after a fixed date, creating immediate operational constraints (Compliance).","Proof of modification: applicability depends on modification documentation (STC SH6080NM or Form 337) which operators must verify (Applicability).","Who pays: financial and operational burden falls on the aircraft owner/operator to inspect and remove non-conforming hardpoints (Requirement).","Limited remedial detail: directive commands removal but does not specify replacement, repair standard, or post-removal disposition, leaving some operational discretion (Requirement vs. absence of replacement instructions).","Access/inspection note: removal/access method is described (NAS 1351-3 cap screw, step mount) which reduces inspection uncertainty (Note 1).","Inter-agency dependency: references FAA AD 96-08-03, which may affect interpretation or cross-jurisdictional follow-up (Note 2)."],"plain_english_summary":"This Airworthiness Directive requires owners/operators of McDonnell Douglas (Hughes) and Kawasaki 369 series helicopters (models 369D, 369E, 369F, 369FF and 500N) fitted with Flight Trials Helicopter Inc. hardpoints to remove from service any hardpoints not marked with the specified part numbers and a serial number. The rule aims to prevent hardpoint failure and possible contact with the fuselage or rotor system; compliance is mandatory before further flight after 22 May 1996."}},"importantCases":[],"_links":{"self":"/api/acts/ad-hu-369-91-flight-trials-hardpoints","history":"/api/acts/ad-hu-369-91-flight-trials-hardpoints/history","analysis":"/api/acts/ad-hu-369-91-flight-trials-hardpoints/analysis","conflicts":"/api/acts/ad-hu-369-91-flight-trials-hardpoints/conflicts","importantCases":"/api/acts/ad-hu-369-91-flight-trials-hardpoints/important-cases","documents":"/api/acts/ad-hu-369-91-flight-trials-hardpoints/documents"}}