{"id":"F2006B04268","name":"AD/BEECH 90/84 - Landing Gear Motor Control Circuit Breaker","slug":"ad-beech-90-84-landing-gear-motor-control-circuit-breaker","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":44072,"registerId":"commonwealth-F2006B04268-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/BEECH 90/84 - Landing Gear Motor Control Circuit Breaker","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)  \nBeechcraft 90 and 65-90 (King Air) Series Aeroplanes\n\nAD/BEECH 90/84 Landing Gear Motor Control Circuit Breaker 11/90\n\nApplicability: All models as listed in the Requirement Document.\n\nRequirement: Install a circuit breaker on the landing gear motor control panel in accordance with Beechcraft Mandatory Service Bulletin 2035 Revision II.\n\nCompliance: Prior to exceeding 100 hours’ time in service after 1 November 1990.\n\nBackground: Compliance with this AD is required to install a circuit breaker in the landing gear motor circuit which will trip and open circuit the landing gear motor circuit before the motor is damaged. Failure to comply with this AD may result in damage to the landing gear motor in a manner which could restrict operation of the manual landing gear extension system, resulting in an inability to manually lower the landing gear.","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, time-bound safety directive with a single purpose: mandating a specific hardware modification to prevent landing gear motor damage. It has not expanded beyond its original technical safety intent."},"complexity_factors":["Single, discrete mechanical modification required","Only one defined applicability criterion (aircraft model series)","Clear compliance deadline (100 hours time-in-service after fixed date)","No nested exceptions, conditional logic, or cross-references to other legislation","Self-contained document with explicit reference to single external technical standard (Service Bulletin)","No interpretive provisions, penalty clauses, or administrative procedures included"],"plain_english_summary":"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 does:**\nRequires owners and operators of certain Beechcraft King Air aeroplanes (models 90 and 65-90 series) to install a **circuit breaker** (a safety switch that automatically cuts electrical power when there's a problem) on the landing gear motor control panel.\n\n**Why it matters:**\nWithout this fix, the landing gear motor could overheat and get damaged. If that happens, it could jam up the backup manual system for lowering the landing gear. In an emergency, you might not be able to get the wheels down — which is obviously catastrophic.\n\n**Who must comply:**\nAnyone operating the affected Beechcraft King Air models. They must complete the installation before the aircraft clocks up 100 flight hours after 1 November 1990.\n\n**How to comply:**\nFollow the technical instructions in **Beechcraft Mandatory Service Bulletin 2035 Revision II** (the manufacturer's official repair notice)."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The directive sets a single, targeted requirement—to install a circuit breaker on the landing gear motor control panel for the models listed in the Requirement Document—and imposes a specific compliance deadline. The text does not indicate any expansion or reduction of applicability or deviation from that stated single purpose. (Applicability; Requirement; Compliance; Background)"},"complexity_factors":["Narrow, specific technical requirement (install a single circuit breaker) reduces substantive complexity (Requirement).","Cross-reference to an external document (Beechcraft Mandatory Service Bulletin 2035 Revision II) introduces procedural and technical complexity because compliance depends on following that bulletin precisely (Requirement).","Applicability is determined by an external \"Requirement Document\" listing models, creating an administrative cross-reference to identify affected aircraft (Applicability).","Short, fixed compliance deadline (100 hours TIS after 1 November 1990) imposes scheduling constraints on operators and maintenance providers (Compliance).","The AD does not set out alternative compliance paths or enforcement detail, so practical compliance depends on regulator practice and the content of the service bulletin (Requirement; Compliance)."],"plain_english_summary":"The directive requires owners/operators of specified Beechcraft 90 and 65‑90 (King Air) aeroplanes to install a circuit breaker on the landing‑gear motor control panel per Beechcraft Mandatory Service Bulletin 2035 Rev II, within 100 hours TIS after 1 Nov 1990. It aims to ensure motor protection to avoid damage that could restrict manual gear extension; costs and scheduling fall to operators and maintenance providers."}},"importantCases":[],"_links":{"self":"/api/acts/ad-beech-90-84-landing-gear-motor-control-circuit-breaker","history":"/api/acts/ad-beech-90-84-landing-gear-motor-control-circuit-breaker/history","analysis":"/api/acts/ad-beech-90-84-landing-gear-motor-control-circuit-breaker/analysis","conflicts":"/api/acts/ad-beech-90-84-landing-gear-motor-control-circuit-breaker/conflicts","importantCases":"/api/acts/ad-beech-90-84-landing-gear-motor-control-circuit-breaker/important-cases","documents":"/api/acts/ad-beech-90-84-landing-gear-motor-control-circuit-breaker/documents"}}