{"id":"F2006B10724","name":"AD/HU 369/60 Amdt 1 - Oil Pressure and Torque Pressure Firewall Fitting Checks","slug":"ad-hu-369-60-amdt-1-oil-pressure-and-torque-pressure-firewall-fitting-checks","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":116709,"registerId":"commonwealth-F2006B10724-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/HU 369/60 Amdt 1 - Oil Pressure and Torque Pressure Firewall Fitting Checks","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 369/60\n\nAmdt 1\n\nApplicability: All models.\n\n  \n\nOil Pressure and Torque Pressure Firewall Fitting Checks\n\n  \n13/87\n\nRequirement: Action in accordance with McDonnell Douglas SIN No. HN-209, DN-149, EN-37 and FN-26.\n\nCompliance: 1. Unless already accomplished, within 100 hours time in service after 31 December 1987; and\n\n    2. Any time the P/N 369A8010 oil lines and related firewall fittings are removed and reinstalled or replaced; and\n\n    3. Any time there are indications of oil leaks around the P/N 369A8010 oil lines at the firewall fittings.\n\nBackground: Incorrectly swaged oil pressure and torque pressure tube assemblies have been found attached to the firewall fittings. These tubes can pull out of the fitting causing loss of engine oil. Amendment 1 to this Directive extends compliance to include all 369 series helicopters.","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":true,"description":"The original directive (implied by 'Amendment 1') appears to have applied to a subset of 369 series helicopters. Amendment 1 explicitly 'extends compliance to include all 369 series helicopters' — broadening the scope from partial to universal coverage of this helicopter series."},"complexity_factors":["Very short document (under 300 words)","Only 4 defined references (the Service Information Notice numbers)","Simple conditional structure: three specific trigger conditions for compliance","No nested exceptions or cross-references to other legislation","Single technical issue addressed with straightforward mechanical remedy","Limited to one aircraft type series (369 series helicopters)"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** — essentially a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA) for aircraft.\n\n**What it does:**\nThis directive requires owners and operators of **McDonnell Douglas (Hughes) and Kawasaki 369 series helicopters** to inspect specific oil pressure and torque pressure fittings on the aircraft's firewall (a protective barrier between the engine and cockpit).\n\n**The safety problem:**\nSome helicopters have been found with **incorrectly swaged** (improperly crimped/secured) tube assemblies connected to firewall fittings. These faulty connections can **pull out during flight**, causing **catastrophic loss of engine oil** and potential engine failure.\n\n**Who must act:**\n- All operators of 369 series helicopters (this amendment expanded the requirement to cover **all models** in the series, not just some)\n\n**What must be done:**\nOperators must follow specific manufacturer service instructions (Service Information Notices HN-209, DN-149, EN-37, and FN-26) to check these fittings:\n- **By deadline:** Within 100 flight hours after 31 December 1987 (if not already done)\n- **After maintenance:** Any time the oil lines or firewall fittings are removed and reinstalled\n- **When leaks appear:** Any time oil leaks are spotted around these specific fittings\n\n**Why it matters:**\nThis is a **life-critical safety fix**. A loose oil line can cause rapid engine oil loss, leading to engine seizure and potential crash. The amendment ensures no helicopter in this series escapes the inspection requirement."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":true,"description":"Yes. The background states that Amendment 1 \"extends compliance to include all 369 series helicopters,\" indicating the directive's scope was broadened to cover the entire 369 series rather than a narrower subset (Background)."},"complexity_factors":["Technical specificity: directive refers to particular part number (P/N 369A8010) and specific tube assembly defects (Background).","Cross-reference burden: requires compliance with four separate McDonnell Douglas Service Information Notices (HN-209, DN-149, EN-37, FN-26) rather than prescribing the procedure inline (Requirement).","Multiple compliance triggers: fixed time window (100 hours after 31 Dec 1987) plus event-driven triggers (removal/reinstallation/replacement of lines; indications of leaks) (Compliance 1–3).","Operational impact: inspections and any corrective work require maintenance labour, parts and aircraft downtime (Compliance; Requirement), which requires coordination with maintenance schedules.","Scope expansion by amendment: Amendment 1 extends applicability to all 369 series helicopters, increasing the population affected (Background)."],"plain_english_summary":"This Airworthiness Directive requires owners/operators of all McDonnell Douglas (Hughes) and Kawasaki 369 series helicopters to inspect and, if needed, correct oil-pressure and torque-pressure tube assemblies at their firewall attachments per the listed McDonnell Douglas service notices. Inspections are due within 100 flight hours after 31 Dec 1987, whenever P/N 369A8010 lines are removed/reinstalled or when leaks are seen. The checks prevent tube pull-out and potential engine oil loss; owners/operators pay for work."}},"importantCases":[],"_links":{"self":"/api/acts/ad-hu-369-60-amdt-1-oil-pressure-and-torque-pressure-firewall-fitting-checks","history":"/api/acts/ad-hu-369-60-amdt-1-oil-pressure-and-torque-pressure-firewall-fitting-checks/history","analysis":"/api/acts/ad-hu-369-60-amdt-1-oil-pressure-and-torque-pressure-firewall-fitting-checks/analysis","conflicts":"/api/acts/ad-hu-369-60-amdt-1-oil-pressure-and-torque-pressure-firewall-fitting-checks/conflicts","importantCases":"/api/acts/ad-hu-369-60-amdt-1-oil-pressure-and-torque-pressure-firewall-fitting-checks/important-cases","documents":"/api/acts/ad-hu-369-60-amdt-1-oil-pressure-and-torque-pressure-firewall-fitting-checks/documents"}}