{"id":"F2006B03500","name":"AD/BAe 146/49 - Engine Driven Pump Case Drain Coupling","slug":"ad-bae-146-49-engine-driven-pump-case-drain-coupling","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":43054,"registerId":"commonwealth-F2006B03500-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/BAe 146/49 - Engine Driven Pump Case Drain Coupling","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)  \nBritish Aerospace BAe 146 Series Aeroplanes\n\nAD/BAe 146/49 Engine Driven Pump Case Drain Coupling 3/94\n\nApplicability: All model BAe 146-100 or -100A series with serial number E1002 through E1199 inclusive, BAe 146-200 or \\-200A series with serial number E2008 through E2204 or E2210 through E2220 inclusive, BAe 146-300 or -300A series with serial number E3001 through E3219 inclusive or serial number E3222.\n\nRequirement: Unless previously carried out, action in accordance with BAe Mandatory Service Bulletin SB.29-31 01339A Revision 1.\n\nNote: FAA AD 93-24-05 amdt 39-8754 refers.\n\nCompliance: By 31 July 1994.\n\nBackground: The manufacturer has advised that during a fire resistance test of the engine driven pump (EDP) and associated hydraulic plumbing the EDP case drain lines leaked.","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The text of this AD sets a targeted scope (specific BAe 146 models and serial-number ranges) and prescribes a single corrective action (the manufacturer’s mandatory service bulletin) to be completed by a fixed date. There is no indication in the provided text that the AD’s scope has been expanded or narrowed from an earlier or original instrument; the AD itself defines its applicability and requirement within this document (Applicability; Requirement; Compliance)."},"complexity_factors":["Specific serial-number applicability requires checking aircraft serial numbers against the listed ranges (Applicability).","Mandatory compliance with an external technical document (BAe Mandatory Service Bulletin SB.29-31 01339A Revision 1) means the AD's technical content is contained outside the AD itself (Requirement).","Fixed compliance deadline imposes scheduling and potential operational disruption risk (Compliance).","Regulatory cross-reference to a related FAA AD may require operators to consider parallel foreign guidance (Note).","Enforcement and record-keeping obligations flow from the AD but are not detailed in the text, leaving procedural implementation to operators and regulator (Header; Requirement)."],"plain_english_summary":"What this instrument does (mechanically)\n\n- This airworthiness directive (AD) requires operators of specified BAe 146 aeroplanes to carry out the corrective actions set out in a particular manufacturer mandatory service bulletin (BAe Mandatory Service Bulletin SB.29-31 01339A Revision 1). (Requirement)\n- It sets a firm deadline for that work: the actions must be completed by 31 July 1994. (Compliance)\n\nWho it affects\n\n- Owners and operators of BAe 146 series aeroplanes that fall within the listed serial number ranges. The affected models and serial numbers are given explicitly. (Applicability)\n- The Civil Aviation Safety Authority (CASA) is the issuing regulator named in the AD header. (Header)\n\nWhy it matters (stated reason and mechanical effect)\n\n- The manufacturer reported that, during a fire-resistance test of the engine driven pump (EDP) and its hydraulic plumbing, the EDP case drain lines leaked. The AD requires the mandated corrective action so the aircraft conform to the manufacturer’s fix. (Background; Requirement)\n\nWho pays and who decides\n\n- The aircraft owner/operator is responsible for arranging and paying for the required work because the AD obliges the operator to carry out the service-bulletin actions. (Requirement; Compliance)\n- CASA is the authority issuing the directive under the Civil Aviation Regulations framework. (Header)\n\nWhat behaviour changes and compliance burden\n\n- Affected operators must obtain and follow the specified mandatory service bulletin to inspect and/or modify the engine driven pump case drain coupling and related plumbing. (Requirement)\n- The burden includes obtaining the service bulletin, performing the work by the deadline, and any associated parts, labour and maintenance scheduling. The AD does not itself describe the technical steps — those are in the referenced service bulletin — so operators must consult that document for exact procedures. (Requirement)\n\nOther implementation notes\n\n- The AD cross-references a related FAA airworthiness directive (FAA AD 93-24-05) in a note. That reference signals coordination with the FAA action but does not itself change the mandatory requirement in this AD. (Note)\n\nTrade-offs, incentives and risks (mechanical and administrative)\n\n- Incentive: Compliance restores the airworthiness condition identified by the manufacturer’s test report; operators avoid non-compliance with the AD by completing the work. (Background; Requirement)\n- Cost: Operators bear the direct cost of parts, labour and downtime required to carry out the service-bulletin actions by the stated deadline. (Requirement; Compliance)\n- Discretion and implementation risk: The AD requires following the service bulletin; the level of discretion for acceptable repairs relies on what the service bulletin prescribes. Operators must interpret and apply that external document correctly to meet the AD’s obligation. (Requirement)\n\nSource citations\n\n- Header: Commonwealth of Australia (Civil Aviation Regulations 1998), Part 39 - 105 Civil Aviation Safety Authority.\n- Applicability: lists models and serial numbers.\n- Requirement: mandates BAe Mandatory Service Bulletin SB.29-31 01339A Revision 1.\n- Compliance: deadline of 31 July 1994.\n- Background: manufacturer observed EDP case drain line leaks during fire-resistance testing."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, targeted safety directive addressing a specific mechanical defect in specific aircraft. It has not expanded beyond its original purpose of mandating a particular engineering fix."},"complexity_factors":["Single, specific technical requirement referencing an external manufacturer service bulletin","Limited applicability — only specific serial number ranges of one aircraft type","No defined terms section or complex conditional logic","Simple compliance deadline (single date)","Short document (approximately 150 words) with straightforward structure","Single cross-reference to equivalent FAA directive for context only"],"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:**\nOrders owners and operators of certain British Aerospace BAe 146 aircraft to inspect and fix a specific hydraulic system component — the **engine driven pump case drain coupling**. This part connects the drain line from the engine-driven hydraulic pump to the aircraft's hydraulic system.\n\n**Why it matters:**\nDuring fire resistance testing, the manufacturer discovered these drain lines could leak. In an engine fire, leaking hydraulic fluid could feed the fire or cause system failures. This directive prevents potential catastrophic fires by ensuring the coupling is replaced or repaired according to the manufacturer's specifications.\n\n**Who it affects:**\nOwners and operators of specific BAe 146 aircraft with serial numbers in the ranges listed (covering -100, -200, and -300 series models). It does NOT apply to every BAe 146 — only those with specific serial numbers manufactured in certain batches.\n\n**What must be done:**\nOperators must follow **British Aerospace Mandatory Service Bulletin SB.29-31 01339A Revision 1** — a technical instruction from the manufacturer detailing exactly how to fix the problem. This had to be completed by **31 July 1994**.\n\n**Key point:** This is a **retrospective safety fix** — it applies to aircraft already in service, not just new ones. Ignoring it would violate civil aviation law and put flight safety at risk."}},"importantCases":[],"_links":{"self":"/api/acts/ad-bae-146-49-engine-driven-pump-case-drain-coupling","history":"/api/acts/ad-bae-146-49-engine-driven-pump-case-drain-coupling/history","analysis":"/api/acts/ad-bae-146-49-engine-driven-pump-case-drain-coupling/analysis","conflicts":"/api/acts/ad-bae-146-49-engine-driven-pump-case-drain-coupling/conflicts","importantCases":"/api/acts/ad-bae-146-49-engine-driven-pump-case-drain-coupling/important-cases","documents":"/api/acts/ad-bae-146-49-engine-driven-pump-case-drain-coupling/documents"}}