{"id":"F2006B02912","name":"AD/B737/215 - Hydraulic Accumulator End Cap Separation","slug":"ad-b737-215-hydraulic-accumulator-end-cap-separation","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":42254,"registerId":"commonwealth-F2006B02912-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"AIRWORTHINESS DIRECTIVE","sectionType":"part","heading":"AIRWORTHINESS DIRECTIVE","content":"# AIRWORTHINESS DIRECTIVE\n\n![](image.001.png)  \n\nFor the reasons set out in the background section, the CASA delegate whose signature appears below issues the following Airworthiness Directive (AD) under subregulation 39.1 (1) of CASR 1998. The AD requires that the action set out in the requirement section (being action that the delegate considers necessary to correct the unsafe condition) be taken in relation to the aircraft or aeronautical product mentioned in the applicability section: (a) in the circumstances mentioned in the requirement section; and (b) in accordance with the instructions set out in the requirement section; and (c) at the time mentioned in the compliance section.\n\n![](image.001.png)  \n\nBoeing 737 Series Aeroplanes","sortOrder":0},{"sectionNumber":"AD/B737/215 Hydraulic Accumulator End Ca","sectionType":"part","heading":"AD/B737/215 Hydraulic Accumulator End Cap Separation 9/2003","content":"# AD/B737/215 Hydraulic Accumulator End Cap Separation 9/2003\n\nApplicability: Boeing 737-100, -200 and -200C series aeroplanes, L/N 1 to 1033 inclusive with hydraulic accumulators installed as referenced in Boeing Special Attention Service Bulletins (BSASB) referred to in the Requirements of this Directive.\n\nRequirement: Hydraulic Accumulators in Landing Gear Brake System:\n\n    Inspect, in accordance with BSASB 737-32-1334 Revision 1, dated 1 March 2001, the hydraulic accumulators in the landing gear brake system to determine if the part number (P/N) is BACA11E2 (vendor P/N 2660472-2 or 2660472M2).\n\n    2. If any hydraulic accumulator is determined to be P/N BACA11E2 (vendor P/N 2660472-2 or 2660472M2), in compliance with Requirement 1, replace the subject hydraulic accumulator with a new or modified accumulator in accordance with BSASB 737-32-1334 Revision 1, dated 1 March 2001.\n\nNote 1: BSASB 737-32-1334 Revision 1, refers to Parker Service Bulletin 2660472- 29-63, dated 12 December 2000, as the appropriate source of service information for modification of the hydraulic accumulators that are subject to replacement per BSASB 737-32-1334 Revision 1.","sortOrder":1},{"sectionNumber":"Hydraulic Accumulators in the Thrust Rev","sectionType":"part","heading":"Hydraulic Accumulators in the Thrust Reverser Actuation Systems:","content":"## Hydraulic Accumulators in the Thrust Reverser Actuation Systems:\n\n    3. Inspect, in accordance with BSASB 737-78-1068 Revision 1, dated 1 March 2001, the hydraulic accumulators in the thrust reverser actuation systems to determine if the P/N is BACA11E2 (vendor P/N 2660472-2 or 2660472M2).\n\n    4. If any hydraulic accumulator is determined to be P/N BACA11E2 (vendor P/N 2660472-2 or 2660472M2), in compliance with Requirement 3, replace the subject hydraulic accumulator with a new or modified accumulator in accordance with BSASB 737-78-1068 Revision 1, dated 1 March 2001.\n\nNote 2: BSASB 737-78-1068 Revision 1, refers to Parker Service Bulletin 2660472- 29-63, dated 12 December 2000, as the appropriate source of service information for modification of the hydraulic accumulators that are subject to replacement per Service Bulletin 737-78-1068 Revision 1.","sortOrder":2},{"sectionNumber":"Boeing 737 Series Aeroplanes","sectionType":"part","heading":"Boeing 737 Series Aeroplanes","content":"## Boeing 737 Series Aeroplanes\n\nAD/B737/215 (continued)","sortOrder":3},{"sectionNumber":"Hydraulic Accumulators not to be install","sectionType":"part","heading":"Hydraulic Accumulators not to be installed:","content":"## Hydraulic Accumulators not to be installed:\n\n    5. Hydraulic accumulators with P/N’s referred to in Requirements 2 and 4 may not be installed on any aircraft as a replacement part.","sortOrder":4},{"sectionNumber":"Alternative Means of Compliance:","sectionType":"part","heading":"Alternative Means of Compliance:","content":"## Alternative Means of Compliance:\n\nInspections and replacements accomplished before the effective date of this Directive per BSASB 737-32-1334, dated 11 May 2000, are considered acceptable for compliance with the corresponding actions required by Requirements 1 and 2.\n\nInspections and replacements accomplished before the effective date of this Directive per BSASB 737-78-1068, dated 8 June 2000, are considered acceptable for compliance with the corresponding action required by Requirements 3 and 4.\n\nNote 3: FAA AD 2003-11-03 Amdt 39-13162 refers.\n\nCompliance: For Requirements 1, 2, 3 and 4: Within 18 months or prior to exceeding 6,000 flight hours from the effective date of this Directive, whichever occurs sooner.\n\nFor Requirement 5: From the effective date of this Directive.\n\nThis Airworthiness Directive becomes effective on 4 September 2003.\n\nBackground: This Directive requires one-time inspections to determine the part numbers of hydraulic accumulators installed in various areas of the aeroplane and follow-on corrective actions as necessary. These actions are intended to prevent high-velocity separation of a barrel, piston or end cap from a hydraulic accumulator. Such separation could result in injury to personnel, loss of cabin pressurisation, loss of affected hydraulic systems or damage to plumbing, electrical installations or structural members.\n\n![Signature of James Coyne, Delegate of the Civil Aviation Safety Authority.](image.002.png)  \n\nJim Coyne\n\nDelegate of the Civil Aviation Safety Authority 25 July 2003\n\n![](image.001.png)  \n\nThe above AD is notified in the Commonwealth of Australia Gazette on 13 August 2003.","sortOrder":5}],"analysis":{"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":true,"description":"This AD converts previously issued Boeing/Parker service bulletin recommendations into mandatory regulatory requirements: it compels one‑time inspections and corrective replacements (Requirements 1–4), prohibits installation of the affected part numbers from the effective date (Requirement 5), and accepts earlier voluntary compliance only where performed per specified BSASB editions (Alternative Means of Compliance)."},"complexity_factors":["Targeted applicability across specific airframe serial numbers (Applicability: L/N 1 to 1033) increases operator sorting and tracking burden.","Multiple system locations required to be checked (landing gear brake and thrust reverser actuation systems) (Requirements 1–4).","Part‑number specific identification required (P/N BACA11E2 and vendor P/Ns 2660472-2 / 2660472M2) (Requirements 1,3).","Mandatory replacement and prohibition on re‑installation of affected parts (Requirements 2,4,5) creates procurement and inventory constraints.","Deadlines combine elapsed time and flight‑hour triggers (Within 18 months or prior to exceeding 6,000 flight hours) (Compliance) which complicates scheduling.","Relies on external service documents for inspection/modification procedures (BSASB 737‑32‑1334, BSASB 737‑78‑1068 and Parker Service Bulletin 2660472‑29‑63) (Notes 1–2).","Alternative Means of Compliance limited to specified earlier BSASB editions (Alternative Means of Compliance)—restricts flexibility for operators.","Regulatory authority and issuance mechanism are explicit (CASR subreg 39.1(1); Delegate signature) but the AD does not set out administrative recordkeeping or certification steps."],"plain_english_summary":"This AD makes inspections and replacements mandatory for certain hydraulic accumulators on Boeing 737-100/-200 series aeroplanes: operators must inspect landing‑gear brake and thrust‑reverser accumulators for a specified part number, replace any affected units, and must not install those part numbers as spares. CASA (by delegate under subreg 39.1(1)) requires these actions to prevent end‑cap/piston separation that could cause injury, loss of hydraulics or structural damage. Operators bear inspection and replacement costs and must meet the AD compliance deadlines."},"kimi_summary":{"content_quality":"ok","complexity_score":3,"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 preventing hydraulic accumulator end cap separation."},"complexity_factors":["Short, single-purpose directive focused on one specific mechanical issue","Clear applicability section limiting scope to specific aircraft line numbers (L/N 1-1033)","Straightforward sequential requirements (inspect, then replace if necessary)","Only 5 requirements total with minimal conditional logic","Cross-references to external Boeing service bulletins rather than internal legislative complexity","Simple compliance timeframe (18 months or 6,000 hours, whichever is sooner)","Limited defined terms (only standard aviation acronyms like P/N, L/N, BSASB)"],"plain_english_summary":"Australia’s aviation regulator (CASA) has issued a mandatory Airworthiness Directive for early Boeing 737s (‑100/‑200/‑200C, line numbers 1–1033). Operators must inspect landing‑gear brake and thrust‑reverser hydraulic accumulators for specific faulty part numbers, replace any affected units, and must not install the banned parts going forward. The action (due within 18 months or 6,000 flight hours) prevents accumulator separations that could injure people, breach cabin pressure, or damage systems."},"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-b737-215-hydraulic-accumulator-end-cap-separation","history":"/api/acts/ad-b737-215-hydraulic-accumulator-end-cap-separation/history","analysis":"/api/acts/ad-b737-215-hydraulic-accumulator-end-cap-separation/analysis","conflicts":"/api/acts/ad-b737-215-hydraulic-accumulator-end-cap-separation/conflicts","importantCases":"/api/acts/ad-b737-215-hydraulic-accumulator-end-cap-separation/important-cases","documents":"/api/acts/ad-b737-215-hydraulic-accumulator-end-cap-separation/documents"}}