{"id":"F2006B10808","name":"AD/IAI-W/8 - Navigation Equipment Mounting Latch Guard - Inspection and Modification","slug":"ad-iai-w-8-navigation-equipment-mounting-latch-guard-inspection-and-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":56286,"registerId":"commonwealth-F2006B10808-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/IAI-W/8 - Navigation Equipment Mounting Latch Guard - Inspection and Modification","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/8 Navigation Equipment Mounting Latch\n\nGuard - Inspection and Modification\n\n\n2/82\n\n \n\nApplicability: All model 1124 Westwind Series Aeroplanes with GNS 500A or LRN 85 Receiver Computer Units (RCU) mounted above rear baggage compartment.\n\n \n\nPart I - S/N up to and including 306.\n\n \n\nPart II - S/N 307 to 309, 311 to 316, 318 to 324.\n\n \n\nDocument: IAI 1124 Westwind SL No. WN-2460A except that locally available parts may be used in place of Kit No. SL WW-2460A.\n\n \n\nCompliance: Within 100 hours time in service after 28 February 1982.\n\n \n\nBackground: Elevator control rod interference has been reported on aircraft where the RCU has been removed.\n","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 interference issue on a specific aircraft type. It has not expanded beyond its original purpose of mandating a physical modification to prevent elevator control interference."},"complexity_factors":["Very short document (approximately 150 words)","Only 2 defined applicability groups (Part I and Part II serial number ranges)","Single compliance requirement with clear deadline","No nested exceptions or conditional logic","Single cross-reference to manufacturer service letter","Straightforward mechanical inspection/modification task"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** — a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA). It requires owners and operators of specific **Israel Aircraft Industries Westwind business jets** to inspect and modify how navigation equipment is mounted.\n\n**What the problem is:**\nOn certain Westwind aircraft (models 1124), the GPS or navigation computer units (called \"Receiver Computer Units\" or RCUs) are mounted above the rear baggage compartment. If these units are removed, the **elevator control rods** (the metal linkages that move the tail surfaces controlling the aircraft's pitch) can interfere with the mounting hardware. This is a serious flight safety risk — interference with flight controls could lead to loss of control.\n\n**Who must comply:**\n- All **Model 1124 Westwind** aircraft with specific serial numbers (up to 324, excluding some numbers)\n- Only those aircraft that have **GNS 500A or LRN 85** navigation computers mounted in the specified location\n\n**What must be done:**\n- Inspect the navigation equipment mounting latch guard\n- Modify it according to the manufacturer's Service Letter (IAI SL No. WN-2460A)\n- Local parts can be substituted for the manufacturer's kit if equivalent\n\n**When:**\n- Within **100 hours of flight time** after 28 February 1982\n\n**Why it matters:**\nThis prevents a potentially catastrophic situation where routine maintenance (removing a navigation unit) could inadvertently damage or jam the elevator controls, risking the lives of everyone on board."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The supplied text does not indicate any change from the original safety objective. It sets a targeted inspection and modification requirement for specific aircraft/RCU configurations to address reported elevator control rod interference. The directive's scope is confined to listed serial numbers and the stated RCU installation position, and no expansion or narrowing beyond that is described in the document."},"complexity_factors":["Applicability limited to a single model (1124) and to specific RCU types (GNS 500A or LRN 85), which narrows affected population","Serial-number-based sub-grouping (Part I and Part II) requires operators to check individual aircraft S/Ns","Reference to a service letter (IAI WN-2460A) sets a technical method but allows substitution of locally available parts, introducing limited implementation discretion","Short compliance window (100 hours time in service after a specified date) creates scheduling and downtime pressure","No alternative compliance pathways or enforcement details are provided in the supplied text, leaving some operational questions to regulator/maintenance practice outside the document"],"plain_english_summary":"This airworthiness directive requires inspection and modification of the navigation‑equipment latch guard on certain Israel Aircraft Industries Westwind 1124 aeroplanes to prevent reported elevator control‑rod interference when the RCU is removed. It applies to aircraft with GNS 500A or LRN 85 RCUs mounted above the rear baggage compartment within specified serial‑number ranges, and must be done per the IAI service letter within the stated compliance window."}},"importantCases":[],"_links":{"self":"/api/acts/ad-iai-w-8-navigation-equipment-mounting-latch-guard-inspection-and-modification","history":"/api/acts/ad-iai-w-8-navigation-equipment-mounting-latch-guard-inspection-and-modification/history","analysis":"/api/acts/ad-iai-w-8-navigation-equipment-mounting-latch-guard-inspection-and-modification/analysis","conflicts":"/api/acts/ad-iai-w-8-navigation-equipment-mounting-latch-guard-inspection-and-modification/conflicts","importantCases":"/api/acts/ad-iai-w-8-navigation-equipment-mounting-latch-guard-inspection-and-modification/important-cases","documents":"/api/acts/ad-iai-w-8-navigation-equipment-mounting-latch-guard-inspection-and-modification/documents"}}