{"id":"F2006B10663","name":"AD/HU 369/103 - Turbine Outlet Temperature Wire Harness","slug":"ad-hu-369-103-turbine-outlet-temperature-wire-harness","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":116590,"registerId":"commonwealth-F2006B10663-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"AIRWORTHINESS DIRECTIVE","sectionType":"part","heading":"AIRWORTHINESS DIRECTIVE","content":"# AIRWORTHINESS DIRECTIVE\n\n![](image.002.png)\n\n![](image.002.png)  \nFor the reasons set out in the background section, the CASA delegate whose signature appears below issues the following Airworthiness Directive (AD) under subregulation 39.1 (1) of CAR 1998. The AD requires that the action set out in the requirement section (being action that the delegate considers necessary to correct the unsafe condition) be taken in relation to the aircraft or aeronautical product mentioned in the applicability section: (a) in the circumstances mentioned in the requirement section; and (b) in accordance with the instructions set out in the requirement section; and (c) at the time mentioned in the compliance section.","sortOrder":0},{"sectionNumber":"AD/HU 369/103 Turbine Outlet Temperature","sectionType":"part","heading":"AD/HU 369/103 Turbine Outlet Temperature Wire Harness 7/2000","content":"# AD/HU 369/103 Turbine Outlet Temperature Wire Harness 7/2000\n\nDM\n\nApplicability: Model 369D, 369E and 500N series helicopters with analogue/digital turbine outlet temperature (TOT) indicator, part number (P/N) 369D24513-1, installed; and Model 600N helicopters, with analogue/digital TOT indicator, P/N 9A3420 installed.\n\nRequirement: 1. For Model 369E, 369D, and 500N helicopters \\-\n\n    Test the TOT indicating system to verify correct calibration in accordance with the Accomplishment Instructions, Part I, of MD Helicopters, Inc. (MDHI) Service Bulletin SB369D-199, SB369E-093, SB500N-019, dated 11 January 2000, as applicable.\n\n    b. If, during any test required by Requirement 1.a., the TOT indicator readings for the tester setting temperatures in Table 1, Part I, of the SB are not within the indicator reading range, perform the actions specified in the Accomplishment Instructions, Part I, paragraph (6)(b) of the applicable SB.\n\n    2. For Model 600N helicopters \\-\n\n    Test the TOT indicating system, including the electronic control unit (ECU) TOT sensing system, to verify correct calibration in accordance with the Accomplishment Instructions, Part I, of MDHI SB600N-026, dated 11 January 2000.\n\n    b. If, during any calibration test required by Requirement 2.a., the TOT indicator readings for the tester setting temperatures in Table 1, Part I, of the SB are not within the indicator reading range, perform the actions specified in the Accomplishment Instructions, Part I, paragraph (7)(b) of the SB.\n\n    c. If, during any test required by Requirement 2.a., the Full Authority Digital Electronic Control (FADEC) maintenance lap-top terminal does not indicate ECU TOT within ± 5 degrees Celsius of the tester setting in Table 1, Part I, of the SB, perform the actions specified in the Accomplishment Instructions, Part III, of the SB.\n\nNote: FAA AD 2000-08-22 Amdt 39-11708 refers.","sortOrder":1}],"analysis":{"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":false,"description":"The AD enforces specific testing and corrective actions for identified models and part numbers as set out by the manufacturer service bulletins. It does not expand applicability beyond those listed helicopters or introduce new regulatory powers; it makes compliance with the referenced service bulletins mandatory for affected aircraft."},"complexity_factors":["Multiple helicopter models and specific part numbers are affected, requiring operators to check applicability carefully.","Normative reliance on external MD Helicopters service bulletins for test procedures and corrective actions.","Technical calibration and testing tasks (including FADEC/ECU checks) require specialised equipment and trained personnel.","Explicit numerical tolerances (indicator ranges and ±5 °C FADEC tolerance) create pass/fail outcomes that trigger mandatory work.","Conditional actions: tests may lead to additional steps (repairs, recalibration) increasing administrative and logistics burden.","Regulatory footing under CAR 1998 subregulation 39.1(1) imposes mandatory compliance and record-keeping obligations on operators."],"plain_english_summary":"This Airworthiness Directive (AD) requires operators of specified MD Helicopters 369D, 369E, 500N and 600N with particular turbine outlet temperature (TOT) indicators to test the TOT indicating system calibration and, where readings fall outside specified ranges, carry out corrective actions set out in MD Helicopters service bulletins. For 600N helicopters the AD also requires checking the ECU/FADEC TOT sensing against a ±5 °C tolerance. CASA issued the directive; owners/operators must arrange and pay for the tests, calibration and any repairs using the prescribed procedures."},"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This AD maintains its original narrow scope — addressing a specific unsafe condition in TOT wire harnesses on specific helicopter models. It has not expanded beyond its original safety purpose."},"complexity_factors":["Short, single-purpose directive with clear applicability section","Only 2 main requirement pathways (one for 369D/E/500N series, one for 600N series)","References to external manufacturer service bulletins (SB369D-199, SB369E-093, SB500N-019, SB600N-026) rather than reproducing full instructions","Simple conditional logic: 'if test fails, then do corrective action'","Limited defined terms (only specific part numbers and model numbers)","No nested exceptions or complex cross-referencing within the instrument itself"],"plain_english_summary":"This AD requires owners/operators of certain MD Helicopters (models 369D, 369E, 500N with TOT indicator P/N 369D24513‑1, and 600N with P/N 9A3420) to test and verify calibration of their Turbine Outlet Temperature (TOT) indicating systems per the manufacturer service bulletins. If readings are out of tolerance, corrective actions must be taken; 600N units also must verify electronic control unit readings are within ±5°C of test settings. Accurate TOT indications prevent engine overheating or inadvertent overtemperature operation."},"flash_summary_failed":{"failed":true,"reason":"A positive credit balance is required for all requests, including BYOK, so fallback providers remain available. Add credits at https://vercel.com/d?to=%2F%5Bteam%5D%2F%7E%2Fai%3Fmodal%3Dtop-up to continue.","source":"analysis-cron"}},"importantCases":[],"_links":{"self":"/api/acts/ad-hu-369-103-turbine-outlet-temperature-wire-harness","history":"/api/acts/ad-hu-369-103-turbine-outlet-temperature-wire-harness/history","analysis":"/api/acts/ad-hu-369-103-turbine-outlet-temperature-wire-harness/analysis","conflicts":"/api/acts/ad-hu-369-103-turbine-outlet-temperature-wire-harness/conflicts","importantCases":"/api/acts/ad-hu-369-103-turbine-outlet-temperature-wire-harness/important-cases","documents":"/api/acts/ad-hu-369-103-turbine-outlet-temperature-wire-harness/documents"}}