{"id":"F2006B11127","name":"AD/LEARJET/11 - Lower Cabin Door Jamb - Inspection","slug":"ad-learjet-11-lower-cabin-door-jamb-inspection","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":56804,"registerId":"commonwealth-F2006B11127-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/LEARJET/11 - Lower Cabin Door Jamb - Inspection","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)  Gates Learjet 24 & 25 Series Aeroplanes\n\n \n\nAD/LEARJET/11 Lower Cabin Door Jamb - Inspection 6/75\n\nApplicability: Model 24 with S/Nos. 24-272, 24-295 to 319 except 24-303, 24-304 and 24-305.\n\nModel 25 with S/Nos. 25-134, 25-168 to 25-195 with 24 inch door installed.\n\n \n\nDocument: Gates Learjet SB 24/25-260.\n\n \n\nCompliance: Within 100 hours time in service after 31 July 1975.\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\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The text sets out a targeted inspection requirement for identified Learjet serial numbers and door configurations and prescribes a compliance window and a specific Service Bulletin for procedure. The instrument itself does not indicate any alteration from an earlier scope; it defines its applicability and compliance obligations directly and therefore does not show a change of scope within the supplied text."},"complexity_factors":["Narrow applicability defined by specific serial numbers","Conditional applicability based on equipment configuration (24‑inch door on certain Model 25 aircraft)","Reference to an external technical document (Gates Learjet SB 24/25-260) for procedural details","A fixed, time‑based compliance window tied to a calendar date and aircraft flight hours","Absence of hazard description or follow-up actions in the AD text itself (requires consulting the Service Bulletin)"],"plain_english_summary":"This airworthiness directive requires operators of specific Gates Learjet Model 24s and certain Model 25s fitted with 24‑inch cabin doors to inspect the lower cabin door jamb per Gates Learjet Service Bulletin SB 24/25‑260.  \n\nThe inspection must be completed within 100 hours time‑in‑service after 31 July 1975; owners/operators must fund and schedule the work and follow the Service Bulletin’s procedures to establish continued airworthiness."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, single-issue airworthiness directive focused specifically on inspecting a particular structural component on specific aircraft models. It has not expanded beyond its original narrow safety purpose."},"complexity_factors":["Very short document (approximately 150 words)","Only 4 defined elements: applicability (specific serial numbers), reference document (Service Bulletin), compliance deadline, and action required","No cross-references to other legislation or regulations beyond the parent Civil Aviation Regulations 1998","Simple conditional logic limited to serial number ranges and one physical characteristic (24-inch door)","Single compliance requirement with clear deadline","No exceptions, exemptions, or nested conditions"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** — essentially a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA). It requires owners and operators of specific Gates Learjet aircraft to inspect the lower cabin door jamb for defects.\n\n**Who it affects:**\n- Owners and operators of **Learjet Model 24** aircraft with specific serial numbers (24-272, and 24-295 through 24-319, excluding three specific planes: 24-303, 24-304, and 24-305)\n- Owners and operators of **Learjet Model 25** aircraft with specific serial numbers (25-134, and 25-168 through 25-195) **only if** they have the 24-inch door installed\n\n**What it requires:**\n- A physical inspection of the lower cabin door jamb (the structural frame around the bottom of the passenger door)\n- The inspection must follow the procedures in **Gates Learjet Service Bulletin 24/25-260** (a technical notice from the manufacturer)\n- Must be completed within **100 hours of flight time** after 31 July 1975\n\n**Why it matters:**\nAirworthiness Directives are legally binding safety requirements. If operators don't comply, their aircraft cannot legally fly in Australian airspace. This particular directive likely addresses a discovered structural weakness or fatigue issue in the door frame that could affect cabin pressurization or door integrity in flight."}},"importantCases":[],"_links":{"self":"/api/acts/ad-learjet-11-lower-cabin-door-jamb-inspection","history":"/api/acts/ad-learjet-11-lower-cabin-door-jamb-inspection/history","analysis":"/api/acts/ad-learjet-11-lower-cabin-door-jamb-inspection/analysis","conflicts":"/api/acts/ad-learjet-11-lower-cabin-door-jamb-inspection/conflicts","importantCases":"/api/acts/ad-learjet-11-lower-cabin-door-jamb-inspection/important-cases","documents":"/api/acts/ad-learjet-11-lower-cabin-door-jamb-inspection/documents"}}