{"id":"F2005L00556","name":"AD/BEECH 300/7 Amdt 1 - Fuselage Stringers 5 Through 11","slug":"ad-beech-300-7-amdt-1-fuselage-stringers-5-through-11","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":112767,"registerId":"commonwealth-F2005L00556-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Beechcraft 300 Series Aeroplanes","sectionType":"division","heading":"Beechcraft 300 Series Aeroplanes","content":"### Beechcraft 300 Series Aeroplanes\n\n| AD/BEECH 300/7 Amdt 1 | Fuselage Stringers 5 Through 11 | 4/2005 DM |\n| --------------------- | ------------------------------- | --------- |\n\n| Applicability: | All models and serial numbers listed in the Requirement document, except those aircraft in which all stringers 5 through 11 on both left hand and right hand sides of the fuselage have been modified in accordance with the requirement document.                                                                                                                                                                                                                                                                                                                |\n| -------------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement:   | 1. Inspect unmodified stringer numbers 5 to 11 on the left and right hand sides of the fuselage in accordance with Part I of Raytheon Service Bulletin SB 53-2472 Rev 4.2. Modify all cracked stringers in accordance with Part II of Raytheon Service Bulletin SB 53-2472 Rev 4.Note 1: FAA AD 2005-01-18 Amdt 39-13943 refers.Note 2: Part III of Raytheon Service Bulletin SB 53-2472 Rev 4 provides instructions for the removal of external doublers so that installation of the internal stringer reinforcement kits per Requirement 2 can be accomplished. |\n| Compliance:    | As detailed in the Requirement document.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |\n|                | This Amendment becomes effective on 10 March 2005.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                |\n| Background:    | The manufacturer has received and confirmed reports of cracking in stringers 5 to 11 near the rear pressure bulkhead. The cracks could affect residual strength under cabin pressure and fuselage bending loads.Amendment 1 is issued to align this Directive with the latest revision of the Requirement document and related new FAA AD.                                                                                                                                                                                                                        |\n\n![](image.001.png)  \nDavid Villiers  \nDelegate of the Civil Aviation Safety Authority\n\n4 March 2005","sortOrder":0},{"sectionNumber":"AD/BEECH 300/7 Amdt 1","sectionType":"part","heading":"AD/BEECH 300/7 Amdt 1","content":"## AD/BEECH 300/7 Amdt 1","sortOrder":1},{"sectionNumber":"Fuselage Stringers 5 Through 11","sectionType":"part","heading":"Fuselage Stringers 5 Through 11","content":"## Fuselage Stringers 5 Through 11","sortOrder":2},{"sectionNumber":"4/2005 DM","sectionType":"part","heading":"4/2005 DM","content":"## 4/2005 DM","sortOrder":3}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is an amendment (Amendment 1) to an existing Airworthiness Directive, but it does not expand scope beyond the original safety purpose. The amendment simply updates the technical reference to align with the latest manufacturer service bulletin revision and corresponding FAA directive. The core scope — addressing cracking in fuselage stringers 5-11 — remains unchanged from the original AD."},"complexity_factors":["Very short document (under 300 words)","Only 1 defined term implicitly used ('stringer' — explained in context)","Single cross-reference to FAA AD 2005-01-18 and manufacturer service bulletin","Simple conditional logic: applies to all aircraft EXCEPT those already modified","No nested exceptions or layered compliance requirements","Straightforward two-step compliance: inspect, then repair if cracked"],"plain_english_summary":"This AD orders owners/operators and maintenance organisations of Beechcraft 300 series aircraft to inspect stringers 5–11 (both sides) and repair any cracks following Raytheon SB 53‑2472 Rev 4. It responds to cracks found near the rear pressure bulkhead that could compromise fuselage strength under pressurisation and bending loads. Aircraft already modified per the manufacturer’s instructions are exempt."},"flash_summary":{"complexity_score":5,"scope_assessment":{"changed":false,"description":"The amendment does not expand the class of affected aircraft; it updates the directive to reference the latest revisions of the Raytheon Service Bulletin and a related FAA AD to ensure consistent technical instructions. Applicability remains limited to the models/serial numbers listed in the Requirement document, except aircraft already modified per that document (Applicability; Requirement; Background)."},"complexity_factors":["Technical maintenance work: Mandates structural inspections and repairs/modifications to fuselage stringers (Requirement: \"Inspect... in accordance with Part I of Raytheon Service Bulletin SB 53-2472 Rev 4.2. Modify all cracked stringers in accordance with Part II of Raytheon Service Bulletin SB 53-2472 Rev 4.\")","Multiple document cross-references: Effect depends on a separate \"Requirement document\" and specific parts/revisions of the Raytheon Service Bulletin (Requirement and Note 2).","Applicability carve-out: Applies to all models/serial numbers listed in the Requirement document except aircraft already modified to apply the fix to all stringers 5–11 on both sides (Applicability).","Inter-jurisdictional alignment: Amendment explicitly aligns the Directive with a related FAA AD (Background; Note 1: \"FAA AD 2005-01-18 Amdt 39-13943 refers.\"), creating coordination requirements for operators complying with multiple regulators.","Implementation steps may be staged: Part III of the service bulletin provides additional preparatory work (external doubler removal) to allow installation of internal reinforcement kits per Requirement 2 (Requirement Note 2), increasing procedural complexity.","Compliance timing and legal effect: The amendment has a fixed effective date (\"This Amendment becomes effective on 10 March 2005.\"), creating a clear but potentially compressed compliance window for operators."],"plain_english_summary":"This airworthiness directive requires owners/operators of affected Beechcraft 300-series aircraft to inspect fuselage stringers 5–11 on both sides and to repair or modify any cracked stringers following Raytheon Service Bulletin SB 53-2472 (Parts I–II). The regulator (Civil Aviation Safety Authority) sets the requirement; operators pay for inspections and repairs. The amendment updates the directive to match the latest service-bulletin revision and a related FAA AD, and takes effect 10 March 2005."},"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"}},"importantCases":[],"_links":{"self":"/api/acts/ad-beech-300-7-amdt-1-fuselage-stringers-5-through-11","history":"/api/acts/ad-beech-300-7-amdt-1-fuselage-stringers-5-through-11/history","analysis":"/api/acts/ad-beech-300-7-amdt-1-fuselage-stringers-5-through-11/analysis","conflicts":"/api/acts/ad-beech-300-7-amdt-1-fuselage-stringers-5-through-11/conflicts","importantCases":"/api/acts/ad-beech-300-7-amdt-1-fuselage-stringers-5-through-11/important-cases","documents":"/api/acts/ad-beech-300-7-amdt-1-fuselage-stringers-5-through-11/documents"}}