{"id":"F2006B03705","name":"AD/BEECH 200/51 Amdt 1 - Nacelle Aft Cowling Door","slug":"ad-beech-200-51-amdt-1-nacelle-aft-cowling-door","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":43295,"registerId":"commonwealth-F2006B03705-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/BEECH 200/51 Amdt 1 - Nacelle Aft Cowling Door","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)  \nBeechcraft 200 (Super King Air) Series Aeroplanes\n\nAD/BEECH 200/51\n\nAmdt 1\n\n  \nNacelle Aft Cowling Door 8/92\n\nApplicability: Models and serial numbers as listed in Beechcraft MSB 2416 Revision 1.\n\nRequirement: (a) Inspect and modify the aft engine cowling doors of both engine nacelles in accordance with Beech MSB 2416 Revision 1.\n\n(b) If the aft engine cowling doors of both nacelles have been inspected and modified in accordance with the original issue of Beech MSB 2416 (as required by superseded FAA AD 91-18-11), then no further action is required by this Directive.\n\nNote 1. The configuration of certain early model aircraft made compliance with the original issue of Beech MSB 2416, as required by superseded FAA AD 91-18-11, impossible.\n\nNote 2. FAA AD 92-10-12 Amdt 39-8246 refers.\n\nCompliance: Unless already accomplished; within 50 hours time in service after 23 July 1992. The compliance of the previous issue of this Directive was as specified in the Requirement Document with a revised effective date of 2 October 1991 for Australian registered aircraft.\n\nThis Amendment is effective from 23 July 1992.\n\nBackground: The FAA has received eleven reports of the aft cowling doors separating from the aircraft. The separated engine cowling doors in some instances have struck the fuselage, wing, empennage, cabin windows, and other parts of the aircraft. This Directive required a one-time inspection and modification of the cowling doors. Amendment 1 is issued in response to the FAA determination that early production Beech 200 series aircraft have different stiffening beads on the inside of the cowling doors. Updated service information has now been issued which specifies procedures for inspecting and modifying nacelles on all of the affected aircraft.","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":true,"description":"Amendment 1 expands and clarifies the original directive by introducing Beech MSB 2416 Revision 1 to provide inspection/modification procedures that cover early-production Beech 200 aircraft with different internal stiffening beads. It therefore changes the prior compliance path under the superseded FAA AD 91-18-11 by providing revised instructions where the original service information could not be applied (Requirement (a),(b); Note 1; Background)."},"complexity_factors":["Technical inspection and modification requirement tied to a specific manufacturer service bulletin (Beech MSB 2416 Revision 1) (Requirement (a))","Applicability limited to models/serial numbers listed in the service bulletin, requiring operators to check eligibility (Applicability)","Conditional exemption for aircraft already modified under the original service bulletin / superseded FAA AD 91-18-11 (Requirement (b))","Acknowledged configuration differences on early-production aircraft that made original procedures impossible, requiring revised procedures (Note 1; Background)","Cross-reference to FAA ADs and prior amendment history creates multi-jurisdictional compliance tracing (Note 2; Background)","Short compliance window (within 50 hours TIS after 23 July 1992) creates scheduling and operational disruption risk for operators (Compliance)","One-time nature reduces recurring regulatory burden but concentrates cost and downtime at the point of compliance (Requirement; Compliance)"],"plain_english_summary":"This directive requires operators of listed Beechcraft 200 (Super King Air) aircraft to inspect and, if necessary, modify the aft engine nacelle cowling doors following Beechcraft MSB 2416 Revision 1, within 50 hours time-in-service of 23 July 1992. CASA issued the directive; aircraft owners/operators pay and schedule the work. The amendment updates earlier FAA-based instructions to cover early-production door variants after reports that aft cowling doors have separated and struck aircraft."},"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":2,"scope_assessment":{"changed":false,"description":"This is an amendment to an existing Airworthiness Directive, but it does not expand scope beyond the original safety purpose. Amendment 1 simply updates the technical requirements to accommodate early-production aircraft that couldn't comply with the original directive due to manufacturing differences. The core purpose — preventing cowling door separation — remains unchanged."},"complexity_factors":["Single, specific mechanical requirement (inspect and modify cowling doors)","Only 2 substantive paragraphs in the Requirement section","Minimal cross-referencing (only to one manufacturer service bulletin and one superseded FAA directive)","Simple conditional logic (compliance exemption if prior work completed under earlier standard)","No defined terms section","Short document (approximately 250 words)"],"plain_english_summary":"This safety order requires owners/operators of affected Beechcraft 200 (Super King Air) aircraft to inspect and modify the rear engine nacelle aft cowling doors per Beechcraft Service Bulletin 2416, Revision 1, within 50 flight hours after 23 July 1992. It applies to the serial numbers listed in the bulletin; previous compliance under the earlier instruction satisfies the mandate, and the revision now covers early builds that couldn’t meet the original procedure. The action responds to 11 in-flight cowling separations that risk impact damage."}},"importantCases":[],"_links":{"self":"/api/acts/ad-beech-200-51-amdt-1-nacelle-aft-cowling-door","history":"/api/acts/ad-beech-200-51-amdt-1-nacelle-aft-cowling-door/history","analysis":"/api/acts/ad-beech-200-51-amdt-1-nacelle-aft-cowling-door/analysis","conflicts":"/api/acts/ad-beech-200-51-amdt-1-nacelle-aft-cowling-door/conflicts","importantCases":"/api/acts/ad-beech-200-51-amdt-1-nacelle-aft-cowling-door/important-cases","documents":"/api/acts/ad-beech-200-51-amdt-1-nacelle-aft-cowling-door/documents"}}