{"id":"F2006B11140","name":"AD/LEARJET/23 Amdt 1 - Tailcone Service Area - Inspection","slug":"ad-learjet-23-amdt-1-tailcone-service-area-inspection","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":56824,"registerId":"commonwealth-F2006B11140-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/LEARJET/23 Amdt 1 - Tailcone Service Area - Inspection","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 24 & 25 Series Aeroplanes\n\nAD/LEARJET/23\n\nAmdt 1\n\n  \nTailcone Service Area \\- Inspection 1/81\n\nApplicability: All models 24 & 25 not incorporating Mod. Kit. No. AMK 80-7.\n\nRequirement: Immediately after the engines are shut down, open the tailcone service area access cover and accomplish the following, using a flashlight or supplemental light as necessary:\n\n    Check the motive flow valves for leaks or stains indicating leaks.\n\n    2. Check all vents and drains to ensure that they are clean and free from obstruction.\n\n    3. Any leaking motive flow valve must be replaced with a new or factory rebuilt valve prior to further flight. 4. Secure access cover.\n\nNote 1. This inspection may be performed and certified by the pilot in command. Note 2. FAA AD 80-19-09 Amdt. 39-3913 refers.\n\nCompliance: After every flight until modified to AMK 80-7.\n\nBackground: Undetected leakage of flammable fluids in the tailcone service area may, when combined with a source of ignition, result in fire or explosion. Incorporation of modification kit AMK 80-7 will eliminated the requirement for post-flight inspection of this area.","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a minor amendment to an existing Airworthiness Directive. The scope remains tightly focused on post-flight inspection of the tailcone service area for specific Learjet models. The amendment appears to be administrative or clarifying rather than an expansion of scope."},"complexity_factors":["Single, discrete operational requirement with only one condition (applicability based on modification status)","No defined terms section — all language is operational and plain","No cross-references to other legislation beyond a single FAA reference note","Simple linear structure: applicability → requirement → compliance → background","Only one exception/limitation: aircraft with AMK 80-7 installed are exempt"],"plain_english_summary":"This Airworthiness Directive mandates that pilots of certain Gates Learjet 24/25 aircraft without modification kit AMK 80-7 perform a post-flight tailcone inspection: open the service panel, use a flashlight to check fuel/hydraulic valves for leaks or stains, ensure vents/drains are clear, replace any leaking valves, and close the panel. The pilot in command may perform and sign off the check. The requirement ends once AMK 80-7 is installed. Amends the original 1981 directive."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":true,"description":"This amendment mandates post-flight inspection after every flight for Learjet 24 & 25 aircraft that do not have AMK 80‑7, authorises the pilot in command to perform and certify the check, and requires replacement of any leaking motive-flow valve before further flight. Installing AMK 80‑7 removes the inspection obligation."},"complexity_factors":["Frequency: inspection required after every flight until aircraft is modified (compliance burden recurring each flight).","Who may certify: pilot in command may perform and certify the inspection (reduces need for licensed maintenance personnel).","Immediate rectification: leaking motive-flow valve must be replaced prior to further flight (creates parts and downtime costs).","Mitigation option: installation of AMK 80‑7 eliminates recurring inspections (up-front modification cost vs ongoing inspection cost).","Safety-critical context: flammable-fluid leakage risk increases compliance pressure and operational risk if inspections are missed.","Operational detail: inspection requires opening access cover and use of flashlight/supplemental light (minimal tooling but procedural).","Reference to FAA AD: cross-references an FAA directive (coordination/harmonisation consideration for operators)."],"plain_english_summary":"This AD requires pilots of Gates Learjet 24 and 25 (unless Mod Kit AMK 80‑7 is fitted) to open the tailcone service-area access cover immediately after engine shutdown and inspect for leaking motive-flow valves, blocked vents/drains, then secure the cover. Any leaking motive-flow valve must be replaced before further flight. Operators bear the inspection time and replacement cost; the pilot may perform and certify the check. Fitting AMK 80‑7 removes the recurring inspection requirement."}},"importantCases":[],"_links":{"self":"/api/acts/ad-learjet-23-amdt-1-tailcone-service-area-inspection","history":"/api/acts/ad-learjet-23-amdt-1-tailcone-service-area-inspection/history","analysis":"/api/acts/ad-learjet-23-amdt-1-tailcone-service-area-inspection/analysis","conflicts":"/api/acts/ad-learjet-23-amdt-1-tailcone-service-area-inspection/conflicts","importantCases":"/api/acts/ad-learjet-23-amdt-1-tailcone-service-area-inspection/important-cases","documents":"/api/acts/ad-learjet-23-amdt-1-tailcone-service-area-inspection/documents"}}