{"id":"F2006B11120","name":"AD/LEARJET 35/5 - Angle of Attack Indicator - Modification","slug":"ad-learjet-35-5-angle-of-attack-indicator-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":56790,"registerId":"commonwealth-F2006B11120-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/LEARJET 35/5 - Angle of Attack Indicator - Modification","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 35/5 Angle of Attack Indicator - Modification 7/77\n\nApplicability: All model 35 and 36 with S/Nos. 35-002 to 35-061 and 36-002 to 36-017 that do not incorporate reduced speed system kit AAK 76-4.\n\n \n\nDocument: Gates Learjet Kit AMK 76-8. Compliance: Forthwith.\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 sets a narrow, equipment-focused requirement for specified serial-numbered Learjet 35 and 36 aeroplanes that do not already have kit AAK 76-4, and directs installation of Kit AMK 76-8 forthwith. The text contains no indication that the scope has changed from the instrument's stated applicability or required action (Applicability; Document; Compliance: Forthwith)."},"complexity_factors":["Narrow fleet applicability limited to two specific model series and defined serial-number ranges (Applicability).","Single, specific technical remedy prescribed (install Kit AMK 76-8) rather than multiple options (Document).","Immediate compliance requirement ('Forthwith') increases operational urgency but simplifies timing (Compliance: Forthwith).","Clear exemption based on presence of alternative kit AAK 76-4 reduces ambiguity (Applicability).","Technical installation dependency: availability of kit and qualified maintenance resources adds logistical complexity.","Regulatory authority is clearly identified (Civil Aviation Regulations 1998, Part 39 header), so enforcement path is straightforward."],"plain_english_summary":"This directive orders immediate installation of Gates Learjet Kit AMK 76-8 to modify the Angle of Attack indicator system on specified Learjet 35 and 36 airframes. It affects owners/operators of the listed serial-numbered aeroplanes (unless already fitted with reduced-speed kit AAK 76-4), and the maintenance/parts suppliers who must source and fit the kit. Owners bear the cost, scheduling and downtime implications."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, targeted safety directive addressing a specific technical deficiency in identified aircraft. It has not expanded beyond its original purpose of mandating angle of attack indicator modifications for early Learjet 35/36 models."},"complexity_factors":["Extremely short document (approximately 150 words)","Only 2 defined applicability criteria (serial number ranges and exclusion for AAK 76-4 kit)","Single compliance requirement with immediate effect","No cross-references to other legislation or regulations beyond the enabling Civil Aviation Regulations 1998","No conditional logic or nested exceptions","Straightforward technical reference to a single manufacturer kit (AMK 76-8)"],"plain_english_summary":"**What this is:** This is an **Airworthiness Directive (AD)** — a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA) under the Civil Aviation Regulations 1998.\n\n**What it requires:** Owners and operators of specific Gates Learjet 35 and 36 series aircraft must install a modification kit (AMK 76-8) to add or fix an **Angle of Attack Indicator** — a cockpit instrument that warns pilots when the aircraft is approaching a stall (losing lift). This helps prevent accidents during takeoff, landing, or low-speed flight.\n\n**Who it affects:** \n- **Aircraft models:** Gates Learjet 35 and 36 series\n- **Specific serial numbers:** 35-002 through 35-061, and 36-002 through 36-017\n- **Exclusion:** Aircraft that already have \"reduced speed system kit AAK 76-4\" installed don't need this modification\n\n**When it must be done:** **Forthwith** — meaning immediately, before the aircraft flies again.\n\n**Why it matters:** Angle of attack indicators are critical safety equipment. Without them, pilots may not receive adequate warning of an impending stall, particularly in challenging flight conditions. This directive addresses a known safety deficiency in early-production Learjet 35/36 aircraft."}},"importantCases":[],"_links":{"self":"/api/acts/ad-learjet-35-5-angle-of-attack-indicator-modification","history":"/api/acts/ad-learjet-35-5-angle-of-attack-indicator-modification/history","analysis":"/api/acts/ad-learjet-35-5-angle-of-attack-indicator-modification/analysis","conflicts":"/api/acts/ad-learjet-35-5-angle-of-attack-indicator-modification/conflicts","importantCases":"/api/acts/ad-learjet-35-5-angle-of-attack-indicator-modification/important-cases","documents":"/api/acts/ad-learjet-35-5-angle-of-attack-indicator-modification/documents"}}