{"id":"F2006L00887","name":"AD/BAe 146/119 - Hydraulic System - Accumulators with Suspect Defect","slug":"ad-bae-146-119-hydraulic-system-accumulators-with-suspect-defect","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":136954,"registerId":"commonwealth-F2006L00887-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"British Aerospace BAe 146 Series Aeropla","sectionType":"division","heading":"British Aerospace BAe 146 Series Aeroplanes","content":"### British Aerospace BAe 146 Series Aeroplanes\n\n| AD/BAe 146/119 | Hydraulic System - Accumulatorswith Suspect Defect | 5/2006 TX |\n| -------------- | -------------------------------------------------- | --------- |\n\n| Applicability: | BAE SYSTEMS - BAe 146 and AVRO 146-RJ series aircraft.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |\n| -------------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement:   | 1. Identify suspect batch number accumulators in accordance with BAe 146 series / Avro 146-RJ series aircraft Inspection Service Bulletin ISB.29-A046 initial issue dated 14 March 2006 or later EASA approved revisions.Only one suspect accumulator is allowed to be installed on an individual aircraft.2. Where such an accumulator is identified, inspect accumulator in accordance with ISB.29-A046.3. Replace identified accumulator in accordance with para 2.D. of ISB.29-A046Terminating action: Replacement of identified accumulator with serviceable accumulator is considered terminating action from the requirements of this AD.Note: EASA Emergency AD number 2006-0061-E dated 17 March 2006 refers. |\n| Compliance:    | 1. Within 48 hours after the effective date of this AD.2. On identification of the suspect accumulator and thereafter, repetitively, at 48 hour inspection intervals, until terminated as detailed in ISB.29-A046.3. Not later than 31 May 2006.                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |\n|                | This Airworthiness Directive becomes effective on 23 March 2006.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |\n| Background:    | Following an in-service failure of a hydraulic accumulator, the manufacturer has identified two suspect batches of accumulator cylinders. Suspect hydraulic accumulators are identified in BAE Systems ISB.29-A046. These accumulators may burst in service with the potential to cause a hazardous event on the aircraft, with an unacceptable probability of occurrence.                                                                                                                                                                                                                                                                                                                                             |\n\n|     | Hazardous event being the resultant flight crew workload associated with the loss of one or more hydraulic circuits, combined with possible fuselage pressure vessel rupture and possible cabin contamination with hydraulic mist. |\n| --- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n\n![](image.001.png)  \nCharles Lenarcic  \nDelegate of the Civil Aviation Safety Authority\n\n21 March 2006","sortOrder":0},{"sectionNumber":"AD/BAe 146/119","sectionType":"part","heading":"AD/BAe 146/119","content":"## AD/BAe 146/119","sortOrder":1},{"sectionNumber":"Hydraulic System - Accumulatorswith Susp","sectionType":"part","heading":"Hydraulic System - Accumulatorswith Suspect Defect","content":"## Hydraulic System - Accumulators  \nwith Suspect Defect","sortOrder":2},{"sectionNumber":"5/2006 TX","sectionType":"part","heading":"5/2006 TX","content":"## 5/2006 TX","sortOrder":3}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This is a targeted emergency safety directive addressing a specific manufacturing defect in hydraulic components. It maintains narrow scope consistent with typical Airworthiness Directives — addressing an identified safety risk without expanding into broader operational or regulatory matters."},"complexity_factors":["Short, single-purpose safety directive with clear mechanical focus","Only 3 compliance requirements with specific deadlines","References external technical document (ISB.29-A046) without reproducing its contents","Minimal defined terms — relies on aircraft operator technical knowledge","Simple conditional logic: identify → inspect → replace","Single terminating action clearly specified"],"plain_english_summary":"This CASA Airworthiness Directive orders urgent checks and replacement of specific suspect hydraulic accumulators on British Aerospace BAe 146 and Avro 146‑RJ aircraft. A manufacturing defect could make them burst in flight, risking hydraulic loss, fuselage rupture and cabin contamination. Operators must check within 48 hours, limit to one suspect unit installed, inspect every 48 hours if present, and replace all suspects by 31 May 2006."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The AD's scope is consistent with its stated purpose: it targets BAe 146 and Avro 146‑RJ series aircraft fitted with accumulators from two identified suspect batches and requires identification, inspection and replacement per ISB.29‑A046. There is no expansion beyond those aircraft and accumulator batches; terminating action and a compliance deadline are expressly specified (Applicability; Requirement; Compliance; Background)."},"complexity_factors":["Cross‑reference to BAE Systems Inspection Service Bulletin ISB.29‑A046 for identification, inspection and replacement procedures (Requirement).","Short initial compliance window (within 48 hours) and repetitive 48‑hour inspection intervals impose rapid operational and maintenance scheduling (Compliance).","A terminating action is specified (replacement with serviceable accumulator) and a calendar cut‑off (not later than 31 May 2006), creating a hard deadline for sourcing parts (Requirement; Compliance).","Restriction that only one suspect accumulator may remain installed per aircraft until replaced increases tracking and configuration‑management needs (Requirement).","Safety rationale ties to in‑service failure and potential multi‑circuit hydraulic loss, fuselage pressure vessel rupture, and cabin contamination — elevating urgency and inspection frequency (Background).","Reference to EASA Emergency AD 2006‑0061‑E creates an external regulatory linkage operators must monitor (Note/Background)."],"plain_english_summary":"This Airworthiness Directive requires operators of BAE Systems BAe 146 and Avro 146‑RJ aircraft to identify hydraulic accumulators from two suspect batches, limit installation to one such accumulator per aeroplane, inspect any identified unit and replace it per BAE ISB.29‑A046. Inspections must start within 48 hours and repeat every 48 hours until replacement; replacement by 31 May 2006 ends the inspection requirement (Requirement; Compliance). Operators and maintenance organisations must fund and perform the work; the AD took effect 23 March 2006 (Compliance; Effective date)."},"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"}},"importantCases":[],"_links":{"self":"/api/acts/ad-bae-146-119-hydraulic-system-accumulators-with-suspect-defect","history":"/api/acts/ad-bae-146-119-hydraulic-system-accumulators-with-suspect-defect/history","analysis":"/api/acts/ad-bae-146-119-hydraulic-system-accumulators-with-suspect-defect/analysis","conflicts":"/api/acts/ad-bae-146-119-hydraulic-system-accumulators-with-suspect-defect/conflicts","importantCases":"/api/acts/ad-bae-146-119-hydraulic-system-accumulators-with-suspect-defect/important-cases","documents":"/api/acts/ad-bae-146-119-hydraulic-system-accumulators-with-suspect-defect/documents"}}