{"id":"F2006B04096","name":"AD/BEECH 60/36 - Fuselage Fatigue Life Limitation","slug":"ad-beech-60-36-fuselage-fatigue-life-limitation","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":43769,"registerId":"commonwealth-F2006B04096-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/BEECH 60/36 - Fuselage Fatigue Life Limitation","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)  Beechcraft 60 (Duke) Series Aeroplanes\n\n \n\nAD/BEECH 60/36 Fuselage Fatigue Life Limitation 3/81\n\nApplicability: All model 60, A60 and B60 Series. Requirement:  Retire the pressure cabin from service. Compliance:               Before exceeding 12,800 pressurised flights.\n\nBackground: Analysis and fatigue tests by the manufacturer have established the above pressure cabin life for these aircraft.\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\n \n","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":1,"scope_assessment":{"changed":false,"description":"This is a discrete, original safety directive issued in 1981 (as indicated by '3/81' in the identifier). It has not expanded beyond its original purpose of establishing a fatigue life limit for the Beechcraft Duke pressure cabin. The scope remains precisely as intended: a mandatory retirement threshold for a specific airframe component on specific aircraft models."},"complexity_factors":["Single, unambiguous requirement with no conditional logic","No defined terms section — uses plain language ('pressure cabin', 'pressurised flights')","No cross-references to other legislation or regulations beyond the parenthetical citation of Civil Aviation Regulations 1998, Part 39","Extremely short — approximately 100 words of substantive content","Single applicability criterion (aircraft model series) and single compliance trigger (flight count)","No exceptions, exemptions, or alternative compliance methods stated"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** — essentially a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA) for specific aircraft.\n\n**What it does:**\n- **Orders the retirement** of the pressure cabin (the sealed part of the fuselage that keeps passengers safe at high altitude) on certain Beechcraft Duke aeroplanes.\n- **Sets a hard limit:** The pressure cabin must be retired from service **before** the aircraft completes 12,800 pressurised flights.\n\n**Who it affects:**\n- Owners and operators of **Beechcraft 60, A60 and B60 series aircraft** (known as the \"Duke\" series).\n\n**Why it matters:**\n- **Fatigue cracks kill.** Every time a plane pressurises and depressurises, the metal fuselage flexes slightly. Over thousands of cycles, tiny cracks can form and grow. This AD is based on **manufacturer testing and analysis** that found 12,800 cycles is the safe limit before the risk of structural failure becomes unacceptable.\n- This is a **life-limiting directive** — it doesn't just require an inspection or repair, it permanently grounds that specific pressure cabin once the limit is reached. The aircraft either needs a new fuselage or goes to the scrapyard."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The directive’s operative scope — retire the pressure cabin on all Model 60/A60/B60 aeroplanes before 12,800 pressurised flights — is stated directly in the instrument (Applicability, Requirement, Compliance) and is consistent with the manufacturer testing rationale supplied (Background). The text supplied contains no indication that the scope has been altered from that stated objective."},"complexity_factors":["Single clear mandatory action (retire pressure cabin) reduces legal complexity (Requirement).","Narrow applicability to three model variants simplifies scope (Applicability).","A single numeric compliance trigger (12,800 pressurised flights) is precise but creates operational complexity for counting and recordkeeping (Compliance).","No procedural detail in the text on counting methods, technical definition of 'retire', replacement options or exemptions increases implementation ambiguity.","Enforcement sits within the airworthiness directive framework, requiring interaction with aviation regulator processes (header reference to Civil Aviation Regulations, PART 39)."],"plain_english_summary":"This directive requires owners/operators of Beechcraft Model 60/A60/B60 aircraft to remove the pressure cabin from service before the airframe completes 12,800 pressurised flights. It enforces a manufacturer‑based life limit for safety, imposes tracking and compliance costs on operators, and will reduce operational capability or resale value as cabins reach that limit."}},"importantCases":[],"_links":{"self":"/api/acts/ad-beech-60-36-fuselage-fatigue-life-limitation","history":"/api/acts/ad-beech-60-36-fuselage-fatigue-life-limitation/history","analysis":"/api/acts/ad-beech-60-36-fuselage-fatigue-life-limitation/analysis","conflicts":"/api/acts/ad-beech-60-36-fuselage-fatigue-life-limitation/conflicts","importantCases":"/api/acts/ad-beech-60-36-fuselage-fatigue-life-limitation/important-cases","documents":"/api/acts/ad-beech-60-36-fuselage-fatigue-life-limitation/documents"}}