{"id":"F2006B10788","name":"AD/IAI-W/13 - Forward Engine Mount Fasteners","slug":"ad-iai-w-13-forward-engine-mount-fasteners","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":56251,"registerId":"commonwealth-F2006B10788-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/IAI-W/13 - Forward Engine Mount Fasteners","content":"---\nmeta-content-style-type: text/css\nmeta-content-type: application/xhtml+xml; charset=utf-8\nmeta-generator: Aspose.Words for .NET 22.10.0\n---\n\n?xml version=\"1.0\" encoding=\"utf-8\" standalone=\"no\"?>\n\nCOMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n \n\n![](image.001.png)  Israel Aircraft Industries 1123 and 1124 (Westwind) Series Aeroplanes\n\n \n\nAD/IAI-W/13 Forward Engine Mount Fasteners 13/89\n\nApplicability: Model 1124, 1124A Westwinds with Serial Numbers prior to 441, except 432, 435 and 438.\n\n \n\nRequirement: Action in accordance with Mandatory Service Bulletin No. 1124-71-091 Revision 2.\n\n \n\nCompliance: Prior to exceeding 100 hours time in service after 28 December 1989 or at the next scheduled inspection for issue of Maintenance Release after 28 December 1989, whichever occurs later, and thereafter at intervals not exceeding 300 hours time in service until replaced.\n\n \n\nBackground: The manufacturer considers this Mandatory. At least one local incident of an H-11 steel forward engine mount bolt failure has occurred.\n","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, single-issue airworthiness directive addressing a specific mechanical defect in a specific aircraft type. It has not expanded beyond its original purpose of addressing H-11 steel bolt failures in Westwind engine mounts."},"complexity_factors":["Single, specific applicability clause (one aircraft type, specific serial number range with only three exclusions)","Single requirement referencing an external document (the Mandatory Service Bulletin)","Simple compliance timeline with clear alternatives ('whichever occurs later')","No defined terms section — uses plain aviation terminology","No cross-references to other legislation or regulations beyond the enabling authority (Civil Aviation Regulations 1998, Part 39)","Background is one sentence explaining the safety rationale","Total length is approximately 150 words"],"plain_english_summary":"**What this is:** This is an **Airworthiness Directive (AD)** — a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA). ADs are legally binding instructions that aircraft owners and operators must follow to fix unsafe conditions in aircraft.\n\n**What it does:** This specific AD applies to certain **Israel Aircraft Industries Westwind business jets** (models 1124 and 1124A with specific serial numbers). It requires owners/operators to inspect or replace **forward engine mount fasteners** (the bolts that hold the engine to the front of the aircraft structure) according to the manufacturer's Mandatory Service Bulletin.\n\n**Who it affects:**\n- Owners and operators of Westwind 1124/1124A aircraft with serial numbers below 441 (excluding serials 432, 435, and 438)\n- Licensed aircraft maintenance engineers who work on these aircraft\n\n**What must be done:**\n- **When:** Before the aircraft reaches 100 flight hours after 28 December 1989, or at the next scheduled maintenance check after that date — whichever comes later\n- **Repeat:** Every 300 flight hours until the bolts are permanently replaced\n- **How:** Follow the manufacturer's Mandatory Service Bulletin No. 1124-71-091 Revision 2 exactly\n\n**Why it matters:** A steel bolt in the forward engine mount failed on at least one aircraft in Australia. If these bolts fail in flight, the engine could detach from the wing or fuselage — a catastrophic safety risk. This AD prevents that by forcing regular inspections until a permanent fix is installed."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The directive sets the applicability, required action and compliance timetable as a single directive; it does not indicate a change from a prior scope within the text provided. It applies to Model 1124 and 1124A Westwinds with serial numbers prior to 441 except 432, 435 and 438 (Applicability), requires action per Mandatory Service Bulletin No. 1124-71-091 Revision 2 (Requirement), and specifies initial and recurring compliance times (Compliance). The document does not state any modification or narrowing/widening of an earlier scope."},"complexity_factors":["Limited and specific applicability by model and serial number (Applicability).","External technical procedure required: refers to Mandatory Service Bulletin No. 1124-71-091 Revision 2 rather than reproducing procedures (Requirement).","A two-stage compliance timing rule: initial action before 100 hours TIS after a specified date or at the next Maintenance Release inspection, whichever is later (Compliance).","Recurring inspection interval specified (every ≤300 hours TIS) until replacement, creating an ongoing obligation (Compliance).","Exemptions for particular serial numbers (exceptions inside Applicability) add a small scope nuance."],"plain_english_summary":"The Civil Aviation Safety Authority requires operators of certain Israel Aircraft Industries Westwind 1124/1124A (early serials) to carry out inspections and remedial work on forward engine‑mount fasteners exactly as set out in the manufacturer’s Mandatory Service Bulletin, prompted by at least one local H‑11 bolt failure. Inspections are required before 100 hours TIS after 28 Dec 1989 and then every 300 hours until replacement. Operators must obtain the bulletin, comply, and bear the costs; CASA enforces the directive."}},"importantCases":[],"_links":{"self":"/api/acts/ad-iai-w-13-forward-engine-mount-fasteners","history":"/api/acts/ad-iai-w-13-forward-engine-mount-fasteners/history","analysis":"/api/acts/ad-iai-w-13-forward-engine-mount-fasteners/analysis","conflicts":"/api/acts/ad-iai-w-13-forward-engine-mount-fasteners/conflicts","importantCases":"/api/acts/ad-iai-w-13-forward-engine-mount-fasteners/important-cases","documents":"/api/acts/ad-iai-w-13-forward-engine-mount-fasteners/documents"}}