{"id":"F2006B11088","name":"AD/LEARJET 35/10 - Cabin Altitude Pressure Limiter - Installation","slug":"ad-learjet-35-10-cabin-altitude-pressure-limiter-installation","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":56748,"registerId":"commonwealth-F2006B11088-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/LEARJET 35/10 - Cabin Altitude Pressure Limiter - Installation","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 35 and 36 Series Aeroplanes\n\n \n\nAD/LEARJET 35/10 Cabin Altitude Pressure Limiter - Installation 1/79\n\nApplicability: Model 35 with S/Nos. 35-001 to 35-112 except S/No. 35-107;\n\n \n\nModel 36 with S/Nos. 36-001 to 36-031.\n\n \n\nDocument: Learjet Airplane Mod. Kit AMK 78-5.\n\n \n\nCompliance: Within 600 hours time in service after 31 January 1979.\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":2,"scope_assessment":{"changed":false,"description":"The directive, as presented, sets a retrofit requirement for a clearly defined set of serial-numbered Model 35 and 36 aircraft to be completed using Learjet AMK 78-5 within a fixed 600-hour time-in-service window after 31 January 1979. The text contains no indication that the scope has been altered from the instrument’s own stated requirements."},"complexity_factors":["Narrow, enumerated applicability by serial number (reduces scope complexity).","Single, specific compliance action: install AMK 78-5 (reduces technical ambiguity).","Fixed compliance deadline measured in flight hours (600 hours TIS), requiring operational scheduling but straightforward to calculate.","Regulatory provenance under the civil aviation airworthiness directive regime (establishes mandatory nature but not multiple compliance paths).","No ancillary compliance options, exemptions, or phased implementation described in the text (limits combinatorial complexity)."],"plain_english_summary":"This Airworthiness Directive mandates installation of the Learjet AMK 78-5 cabin altitude pressure limiter on specified Gates Learjet Model 35 (S/N 35‑001 to 35‑112, except 35‑107) and Model 36 (S/N 36‑001 to 36‑031) aircraft. Owners/operators must fit the kit within 600 hours time‑in‑service after 31 Jan 1979 and bear the cost, affecting scheduling, parts and maintenance capacity."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, targeted safety directive for specific aircraft models. It has not expanded beyond its original purpose of mandating a specific safety modification to address a known risk in identified Learjet aircraft."},"complexity_factors":["Extremely short document (approximately 150 words)","Only 4 operative provisions: applicability, document reference, compliance deadline, and the action required","No defined terms section — all language is technical but self-explanatory to intended audience (aircraft maintenance engineers)","No cross-references to other legislation or regulations within the text itself","Simple conditional logic: if you own these specific serial numbers, you must install this specific kit by this specific deadline","Single exception to applicability (S/No. 35-107 excluded) — no nested exceptions"],"plain_english_summary":"**What this is:** 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 requires:** Owners and operators of certain Gates Learjet 35 and 36 series aircraft must install a \"Cabin Altitude Pressure Limiter\" — a safety device that prevents the cabin from depressurizing too quickly or reaching unsafe altitudes.\n\n**Who it affects:** \n- **Model 35 aircraft** with serial numbers 35-001 through 35-112, **except** serial number 35-107\n- **Model 36 aircraft** with serial numbers 36-001 through 36-031\n\n**How to comply:** Install the modification kit identified as \"Learjet Airplane Mod. Kit AMK 78-5\" within 600 hours of flight time after 31 January 1979.\n\n**Why it matters:** This directive addresses a specific safety risk in these particular Learjet models. Without this modification, there may be a risk of cabin pressure failures that could endanger passengers and crew at high altitudes. Airworthiness Directives are legally binding — failure to comply means the aircraft cannot legally fly."}},"importantCases":[],"_links":{"self":"/api/acts/ad-learjet-35-10-cabin-altitude-pressure-limiter-installation","history":"/api/acts/ad-learjet-35-10-cabin-altitude-pressure-limiter-installation/history","analysis":"/api/acts/ad-learjet-35-10-cabin-altitude-pressure-limiter-installation/analysis","conflicts":"/api/acts/ad-learjet-35-10-cabin-altitude-pressure-limiter-installation/conflicts","importantCases":"/api/acts/ad-learjet-35-10-cabin-altitude-pressure-limiter-installation/important-cases","documents":"/api/acts/ad-learjet-35-10-cabin-altitude-pressure-limiter-installation/documents"}}