{"id":"F2006B11113","name":"AD/LEARJET 35/34 Amdt 1 - Auxiliary Cabin Heater Wiring","slug":"ad-learjet-35-34-amdt-1-auxiliary-cabin-heater-wiring","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":56777,"registerId":"commonwealth-F2006B11113-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/LEARJET 35/34 Amdt 1 - Auxiliary Cabin Heater Wiring","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)  \nGates Learjet 35 and 36 Series Aeroplanes\n\nAD/LEARJET 35/34\n\nAmdt 1\n\n  \nAuxiliary Cabin Heater Wiring 6/98\n\nApplicability: Model 35A aeroplanes with serial numbers 35-647 through 35-670 inclusive.\n\nRequirement: Replace two segments of 16 American Wire Gauge (AWG) wire with 8 AWG wire at connector P190 in accordance with Learjet Service Bulletin SB 35-21-24 Revision 1 dated 13 August 1996.\n\nNote 1: Accomplishment of the replacement in accordance with the procedures specified in Learjet Service Bulletin SB 35-21-24 dated 6 September 1995, but using equipment that is identical or equivalent to that of the applicable kit specified in Revision 1 of the service bulletin is considered an acceptable method of compliance.\n\nNote 2: FAA AD 98-06-28 Amdt 39-10406 refers.\n\nCompliance: Prior to 31 August 1998.\n\nThis amendment becomes effective on 21 May 1998.\n\nBackground: Two segments of 16 AWG wire in the auxiliary cabin heater circuit provide inadequate current carrying capacity. This could lead to the wiring overheating and subsequent fire hazard. Replacement of the 16 AWG wire segments with 8 AWG wire segments is designed to ensure that the wire size is adequate for the circuit requirements.\n\nThis amendment is issued following advice from the Federal Aviation Administration that the socket contact supplied in the kit specified in the original service bulletin was an incorrect part number for use in connector P190.\n\nThe original issue of this airworthiness directive became effective on 15 August 1996.","sortOrder":0}],"analysis":{"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 amendment maintains the original narrow scope. It updates a specific technical detail (correcting the part number for a socket contact in the repair kit) while keeping the same safety purpose and affected aircraft population. The amendment does not expand coverage to additional aircraft models, extend the compliance deadline, or introduce new requirements beyond the original wiring replacement mandate."},"complexity_factors":["Very short document (under 300 words)","Only 4 defined elements: specific aircraft model, serial number range, wire gauge specifications (16 AWG and 8 AWG), and connector identifier (P190)","Single technical requirement with one alternative compliance method explicitly permitted in Note 1","No cross-references to other legislation beyond a single reference to the corresponding FAA directive","Clear, linear structure: applicability → requirement → notes → compliance date → background"],"plain_english_summary":"Owners/operators of Gates Learjet 35A aircraft (S/N 35-647 through 35-670) must replace two short runs of thin 16‑gauge wiring with thicker 8‑gauge wire at connector P190, per Learjet SB 35-21-24 Rev 1.  \n\nThis AD addresses an overheating/fire hazard from undersized wire (and corrects a prior kit’s wrong socket). The retrofit deadline was 31 August 1998; earlier compliance using the 1995 instructions is acceptable if the updated kit’s correct parts were used."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The amendment corrects the parts-kit specification and refers to a revised service bulletin (Background; Requirement) but does not change which aircraft are affected or the substantive remedial action required (replace the two wire segments). It therefore refines implementation details without expanding or narrowing the directive's applicability or core mandate (Applicability; Requirement)."},"complexity_factors":["Narrow applicability limited to Model 35A serial numbers 35-647 through 35-670 (Applicability).","Technical electrical change: replacement of 16 AWG wire segments with 8 AWG (Requirement; Background).","Mandated compliance with a specific service bulletin revision (SB 35-21-24 Revision 1 dated 13 August 1996) rather than general instructions (Requirement).","Acceptable alternative method clause permitting identical/equivalent equipment per original service bulletin (Note 1) introduces limited procedural discretion.","Cross-reference to a related FAA airworthiness directive (FAA AD 98-06-28) adds regulatory coordination (Note 2).","Fixed compliance deadline (prior to 31 August 1998) creates scheduling pressure for operators (Compliance).","Correction to kit part number in this amendment creates potential parts-sourcing and supply-chain complexity (Background).","Compliance imposes direct maintenance cost, parts procurement and aircraft downtime on the aircraft owners/operators (Requirement; Compliance)."],"plain_english_summary":"This directive requires owners/operators of specific Learjet 35A aeroplanes (serials 35-647 to 35-670) to replace two undersized 16 AWG wires in the auxiliary cabin heater circuit with 8 AWG wire, using the revised Learjet service bulletin, to prevent wiring overheating and fire. The rule creates a direct compliance cost and downtime for affected operators, and depends on using the corrected kit (or an identical/equivalent method) identified in the service bulletin; work must be done by 31 August 1998."}},"importantCases":[],"_links":{"self":"/api/acts/ad-learjet-35-34-amdt-1-auxiliary-cabin-heater-wiring","history":"/api/acts/ad-learjet-35-34-amdt-1-auxiliary-cabin-heater-wiring/history","analysis":"/api/acts/ad-learjet-35-34-amdt-1-auxiliary-cabin-heater-wiring/analysis","conflicts":"/api/acts/ad-learjet-35-34-amdt-1-auxiliary-cabin-heater-wiring/conflicts","importantCases":"/api/acts/ad-learjet-35-34-amdt-1-auxiliary-cabin-heater-wiring/important-cases","documents":"/api/acts/ad-learjet-35-34-amdt-1-auxiliary-cabin-heater-wiring/documents"}}