{"id":"F2006B06712","name":"AD/S-76/3 Amdt 1 - Engine Air Inlet Cowl and Aft Cowl Assemblies - Modification","slug":"ad-s-76-3-amdt-1-engine-air-inlet-cowl-and-aft-cowl-assemblies-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":114525,"registerId":"commonwealth-F2006B06712-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/S-76/3 Amdt 1 - Engine Air Inlet Cowl and Aft Cowl Assemblies - 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)  Sikorsky S-76 Series Helicopters\n\n \n\nAD/S-76/3\n\nAmdt 1\n\n\nEngine Air Inlet Cowl and Aft Cowl Assemblies - Modification\n\n\n6/80\n\n \n\nApplicability: All model S-76 with S/Nos. 76005 to 76007, 760001 to 760037.\n\n \n\nDocuments: 1. Sikorsky SB 76-53-10;\n\n \n\n2. Sikorsky Drawings 76070-30001 and 76080-30007;\n\n \n\n3. Sikorsky EO 83184 against Drawing 76303-07001; EO 83185 against Drawing 76302-07001; and EO 83189, EO 83190 and EO 83191 against Drawing 76080- 30006; or\n\n \n\n4. FAA AD 80-02-10, Amendment 39-3717.\n\n \n\nCompliance: Unless already accomplished, within 100 hours time in service after 30 June 1980.\n\n \n\nBackground:  This Directive is varied to prevent structural failures of the engine air inlet cowl doors and in-flight opening of their attaching latch handles.\n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a standard, narrow airworthiness directive focused on a specific mechanical modification to a specific aircraft type. It has not expanded beyond its original safety purpose."},"complexity_factors":["Very short document (approximately 250 words)","Only 4 defined terms or reference documents listed","Single, clear compliance requirement (100 hours time in service)","No nested exceptions or conditional logic","Straightforward applicability (specific serial number ranges)","No cross-references to other legislation or regulations beyond the enabling Civil Aviation Regulations 1998"],"plain_english_summary":"This Airworthiness Directive from CASA requires owners and operators of specified Sikorsky S‑76 helicopters (serials 76005–76007 and 760001–760037) to modify the engine air inlet cowl and aft cowl assemblies to prevent cowl door structural failure and in‑flight latch openings. The mandatory modification must be done within 100 flight hours after 30 June 1980 unless already completed—protecting against engine damage, power loss, and associated safety risks."},"flash_summary":{"complexity_score":6,"scope_assessment":{"changed":true,"description":"The amendment explicitly 'varies' the prior Directive to require specified modifications aimed at preventing structural failures of engine air inlet cowl doors and in-flight opening of latch handles. It therefore changes scope by imposing mandatory modification work on the listed S-76 serial numbers, setting a defined compliance deadline (100 hours after 30 June 1980) and tying compliance to multiple Sikorsky drawings, engineering orders and an FAA AD (see Background, Applicability, Documents, Compliance)."},"complexity_factors":["Applicability: narrow serial-number range (Applicability paragraph) — requires accurate fleet identification and tracking","Documents: multiple external technical references (Sikorsky SB 76-53-10, several drawings and engineering orders, FAA AD 80-02-10) — increases coordination and document control (Documents paragraph)","Compliance timing: fixed short compliance window ('within 100 hours time in service after 30 June 1980') — operational scheduling burden (Compliance paragraph)","Technical work: modification per specific drawings and EOs implies detailed engineering/maintenance actions and possible parts or tooling needs (Documents paragraph)","Legal formulation: 'Unless already accomplished' creates evidential burden to prove prior compliance","Amendment effect: directive is 'varied' to address specific failure modes (Background) — may change prior obligations and requires checking predecessor directives"],"plain_english_summary":"Requires owners/operators of specified Sikorsky S-76 helicopters (S/N 76005–76007, 760001–760037) to modify engine air inlet cowl and aft cowl assemblies according to Sikorsky technical drawings, service bulletin and referenced FAA AD. Compliance is mandatory within 100 flight hours after 30 June 1980. The amendment is stated to prevent structural failures of inlet cowl doors and in‑flight opening of their latch handles. Operators pay for and must implement the specified modifications using the listed documents."}},"importantCases":[],"_links":{"self":"/api/acts/ad-s-76-3-amdt-1-engine-air-inlet-cowl-and-aft-cowl-assemblies-modification","history":"/api/acts/ad-s-76-3-amdt-1-engine-air-inlet-cowl-and-aft-cowl-assemblies-modification/history","analysis":"/api/acts/ad-s-76-3-amdt-1-engine-air-inlet-cowl-and-aft-cowl-assemblies-modification/analysis","conflicts":"/api/acts/ad-s-76-3-amdt-1-engine-air-inlet-cowl-and-aft-cowl-assemblies-modification/conflicts","importantCases":"/api/acts/ad-s-76-3-amdt-1-engine-air-inlet-cowl-and-aft-cowl-assemblies-modification/important-cases","documents":"/api/acts/ad-s-76-3-amdt-1-engine-air-inlet-cowl-and-aft-cowl-assemblies-modification/documents"}}