{"id":"F2006B03645","name":"AD/BEECH 1900/28 - Cabin Oxygen Mask Lanyards","slug":"ad-beech-1900-28-cabin-oxygen-mask-lanyards","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":43235,"registerId":"commonwealth-F2006B03645-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/BEECH 1900/28 - Cabin Oxygen Mask Lanyards","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 1900 Series Aeroplanes\n\nAD/BEECH 1900/28 Cabin Oxygen Mask Lanyards 8/99\n\nDM\n\nApplicability: Model 1900D aeroplanes with Serial Numbers UE-1 through UE-338 inclusive. Requirement: 1. Replace the passenger oxygen container and mask assembly Part Number (P/N)\n\n129-384005-3 with an improved design, P/N 129-384005-5, by installing Puritan\n\nBennett retrofit Kit No 280041-00 in accordance with Raytheon Aircraft Mandatory Service Bulletin SB 35-3233 issued December 1998.\n\n2. Passenger oxygen container and mask assemblies P/N 129-384005-3 may not be installed in any aeroplane.\n\nNote: FAA AD 99-12-07 Amdt 39-11191 refers.\n\nCompliance: 1. Within the next 200 hours time in service from the effective date of this Directive.\n\n2. As of the effective date of this Directive.\n\nThis Airworthiness Directive becomes effective on 7 July 1999.\n\nBackground: The United States Federal Aviation Administration has advised of an incident in a Beech 1900D aeroplane where a passenger had put on an oxygen mask and the lanyard pin did not automatically pull and initiate oxygen flow during a loss of pressurisation.\n\nThis Directive requires the installation of shorter length cabin oxygen mask lanyards which will ensure the oxygen flow mechanism is automatically activated as the mask is grasped and pulled to the face. This action is designed to prevent passenger injury if the lanyard pin is not manually pulled in a timely manner.","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 is a standard, narrow Airworthiness Directive addressing a specific safety defect in a specific aircraft model. It has not expanded beyond its original purpose of mandating a hardware replacement to fix a known oxygen mask design flaw."},"complexity_factors":["Very short document (approximately 250 words)","Only 2 defined part numbers referenced","Single applicability criterion (specific serial number range)","Two straightforward compliance requirements with clear deadlines","No nested exceptions or conditional logic","No cross-references to other legislation (only a note about a related US FAA directive)","Clear, linear structure: applicability → requirement → compliance → background"],"plain_english_summary":"This Airworthiness Directive requires owners/operators of Beechcraft 1900D serials UE-1–UE-338 to replace passenger oxygen container/mask assemblies (P/N 129-384005-3) with an improved assembly (P/N 129-384005-5) using the mandated retrofit kit. The change is required within 200 flight hours from 7 July 1999, and the old parts were immediately banned. The retrofit prevents failure of automatic oxygen flow caused by overly long mask lanyards during depressurisation."},"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The directive's scope aligns with the stated remedial intent in the Background: it targets a specific activation failure by mandating retrofit of a specified part number for Beech 1900D aircraft (S/N UE-1 to UE-338) and banning the older assembly. The text shows no expansion beyond that technical fix or the affected serial range."},"complexity_factors":["Limited applicability: specific to Beech 1900D, Serial Numbers UE-1 through UE-338 (Applicability).","Prescriptive technical action: mandatory replacement of P/N 129-384005-3 with P/N 129-384005-5 via Puritan Bennett retrofit Kit No 280041-00 (Requirement 1).","Mandatory prohibition: older assemblies P/N 129-384005-3 may not be installed after the effective date (Requirement 2).","Fixed compliance window: replacement must occur within 200 hours time in service from the effective date (Compliance 1).","Cross-references to external documents: installation must follow Raytheon Mandatory Service Bulletin SB 35-3233 and the AD references FAA AD 99-12-07 (Requirement, Note).","Operational/implementation effects: operators must procure specific kit/parts and schedule installation within the flight-hours window, creating potential downtime and supply/maintenance coordination needs (implied by Requirement and Compliance).","Legal effect timing: directive becomes effective on a stated date, creating an immediate prohibition on reinstalling the old part (Effective date; Requirement 2)."],"plain_english_summary":"The directive requires owners/operators of Beech 1900D aeroplanes (serials UE‑1 to UE‑338) to replace passenger oxygen container-and-mask assemblies P/N 129-384005-3 with improved P/N 129-384005-5 by installing Puritan Bennett retrofit Kit No 280041-00 per Raytheon Service Bulletin SB 35-3233, and bans re‑installation of the old part. Compliance is within 200 flight hours from the effective date (7 July 1999). The stated purpose is to ensure the mask lanyard reliably activates oxygen flow when the mask is pulled, addressing a reported failure."}},"importantCases":[],"_links":{"self":"/api/acts/ad-beech-1900-28-cabin-oxygen-mask-lanyards","history":"/api/acts/ad-beech-1900-28-cabin-oxygen-mask-lanyards/history","analysis":"/api/acts/ad-beech-1900-28-cabin-oxygen-mask-lanyards/analysis","conflicts":"/api/acts/ad-beech-1900-28-cabin-oxygen-mask-lanyards/conflicts","importantCases":"/api/acts/ad-beech-1900-28-cabin-oxygen-mask-lanyards/important-cases","documents":"/api/acts/ad-beech-1900-28-cabin-oxygen-mask-lanyards/documents"}}