{"id":"F2006B10791","name":"AD/IAI-W/16 Amdt 1 - Engine and Flight Data Monitoring","slug":"ad-iai-w-16-amdt-1-engine-and-flight-data-monitoring","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":56255,"registerId":"commonwealth-F2006B10791-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/IAI-W/16 Amdt 1 - Engine and Flight Data Monitoring","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)  \nIsrael Aircraft Industries 1123 and 1124 (Westwind) Series Aeroplanes\n\nAD/IAI-W/16\n\nAmdt 1\n\n  \n\nEngine and Flight Data Monitoring 11/94 DM\n\nApplicability: IAI 1124 series aircraft fitted with AlliedSignal TFE731-3 series engines not incorporating AlliedSignal Service Bulletin TFE731-72-3502.\n\nRequirement: 1. Amend the Limitation Section of the Airplane Flight Manual (AFM) to reflect the requirements of Federal Aviation Administration (FAA) Airworthiness Directive (AD) 94-07-03, paragraphs (a), (1), (2), (3) and (4) by inserting AFM amendment A/1124/8 or A/1124A/12 as appropriate, and\n\n    2. Calculate the data recorded in accordance with FAA AD 94-07-03, paragraph (b), (1), and\n\n    3. Action in accordance with FAA AD 94-07-03, paragraph (b), (2), and\n\n    4. Action in accordance with FAA AD 94-07-03, paragraph (c).\n\n    5. Compliance with the Requirements of CAO 106, AD/TFE731/25 on both engines provides a terminating action for the Requirements 1 through 4 of this Directive.\n\nCompliance: Effective 14 September 1994; Unless previously accomplished, prior to further flight.\n\nBackground: This Directive was originally issued in September 1992 to address two reports of uncontained failure of AlliedSignal TFE731-3 first stage low pressure turbine discs following failure of certain low pressure turbine nozzle airseals. Following a report of a further low pressure turbine disc failure, this Directive has been amended to reflect more stringent requirements for verifying low pressure rotor lock-up during engine start and for the detection of rubbing noises following engine shut down.","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":true,"description":"The Directive amends the original 1992 requirements to impose more stringent procedures for verifying low‑pressure rotor lock‑up during engine start and for detecting rubbing noises after shutdown, following further reports of low‑pressure turbine disc failure. (See Background: 'amended to reflect more stringent requirements for verifying low pressure rotor lock‑up... and for the detection of rubbing noises'.)"},"complexity_factors":["Technical specificity: requirements target engine‑internal phenomena (low‑pressure turbine rotor lock‑up and post‑shutdown rubbing) requiring specialist inspection and monitoring.","Cross-references to external mandates: several actions are defined by FAA AD 94‑07‑03, so compliance depends on interpreting and following that external document.","Operational immediacy: compliance is required 'prior to further flight' unless already done, creating potential for immediate grounding or scheduling disruption.","Alternative terminating action: compliance can be ended by meeting CAO 106 / AD/TFE731/25 on both engines, creating conditional paths and recordkeeping obligations.","Narrow applicability: applies only to IAI 1124 series with specific engines and absent a particular service bulletin, requiring operators to determine applicability precisely."],"plain_english_summary":"This airworthiness directive requires IAI 1124 aeroplanes with AlliedSignal TFE731‑3 engines (unless Service Bulletin TFE731‑72‑3502 is installed) to amend their Flight Manual, record and calculate engine/flight data, and carry out inspections and actions cross‑referenced to FAA AD 94‑07‑03. It was issued after multiple low‑pressure turbine disc failures and targets verification of rotor lock‑up during engine start and detection of rubbing noises after shutdown. Operators must comply before further flight; an alternative terminating action is available via CAO 106 / AD/TFE731/25."},"flash_summary_failed":{"failed":true,"reason":"Unauthenticated. Configure AI_GATEWAY_API_KEY or use a provider module. Learn more: https://ai-sdk.dev/unauthenticated-ai-gateway","source":"analysis-cron"},"kimi_summary":{"content_quality":"ok","complexity_score":4,"scope_assessment":{"changed":true,"description":"Originally issued in September 1992 as a basic engine monitoring requirement, this Amendment 1 significantly expanded the scope after a third turbine disc failure occurred. The amendment added 'more stringent requirements' including specific verification of low pressure rotor lock-up during starts and mandatory detection of rubbing noises post-shutdown. The original intent was basic data monitoring; the amended version became an active diagnostic protocol with specific operational checks."},"complexity_factors":["Heavy reliance on external documents: The directive doesn't spell out the actual requirements in full — it references FAA AD 94-07-03 paragraphs (a)(1)-(4), (b)(1)-(2), and (c), requiring readers to cross-reference US regulations","Conditional applicability: Applies only to IAI 1124 series (not 1123 despite header mention) with specific engine model AND excludes aircraft with specific service bulletin incorporated","Terminating action clause: Creates a conditional exit from compliance through reference to another directive (CAO 106, AD/TFE731/25) applied to both engines","Technical aviation terminology: Uses specialized terms like 'uncontained failure', 'low pressure turbine disc', 'low pressure rotor lock-up', 'nozzle airseals' without definition","Dual manual amendment paths: Requires inserting either AFM amendment A/1124/8 or A/1124A/12 'as appropriate' — requiring operator knowledge of their specific aircraft configuration"],"plain_english_summary":"This CASA Airworthiness Directive targets certain IAI Westwind 1123/1124 jets with AlliedSignal TFE731-3 engines (unless modified by SB TFE731-72-3502) to address recurring uncontained first-stage low-pressure turbine disc failures caused by failing low-pressure turbine nozzle airseals.  \n\nIt mandates flight manual changes, ongoing engine monitoring and start checks, and post-shutdown listening for rubbing; complying with the alternative AD on both engines removes the monitoring requirement. It affects a small Australian Westwind fleet and is a life-critical safety order."}},"importantCases":[],"_links":{"self":"/api/acts/ad-iai-w-16-amdt-1-engine-and-flight-data-monitoring","history":"/api/acts/ad-iai-w-16-amdt-1-engine-and-flight-data-monitoring/history","analysis":"/api/acts/ad-iai-w-16-amdt-1-engine-and-flight-data-monitoring/analysis","conflicts":"/api/acts/ad-iai-w-16-amdt-1-engine-and-flight-data-monitoring/conflicts","importantCases":"/api/acts/ad-iai-w-16-amdt-1-engine-and-flight-data-monitoring/important-cases","documents":"/api/acts/ad-iai-w-16-amdt-1-engine-and-flight-data-monitoring/documents"}}