{"id":"F2006B03323","name":"AD/B767/147 - Hydraulic Shutoff Valves","slug":"ad-b767-147-hydraulic-shutoff-valves","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":42760,"registerId":"commonwealth-F2006B03323-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"AIRWORTHINESS DIRECTIVE","sectionType":"part","heading":"AIRWORTHINESS DIRECTIVE","content":"# ![](image.001.png)  \nAIRWORTHINESS DIRECTIVE\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 CAR 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 767 Series Aeroplanes","sortOrder":0},{"sectionNumber":"AD/B767/147 Hydraulic Shutoff Valves 9/2","sectionType":"part","heading":"AD/B767/147 Hydraulic Shutoff Valves 9/2001","content":"# AD/B767/147 Hydraulic Shutoff Valves 9/2001\n\nApplicability: All Boeing 767 series aeroplanes equipped with hydraulic shutoff valves manufactured by Circle Seal Controls.\n\nNote 1: Only motor operated hydraulic shutoff valves manufactured by Circle Seal Controls that are installed in the locations specified in applicable alert service bulletin (ASB) are subject to this Directive.\n\nRequirement: 1. Perform an operational check of affected motor operated hydraulic shutoff valves in accordance with Boeing ASB 767-29A0083, Revision 4, dated 28 September 2000.\n\nIf any malfunction of the valve is detected, prior to further flight, replace the valve with a new or serviceable Whittaker Controls or Circle Seal Controls valve in accordance with ASB 767-29A0083, Revision 4.\n\n    2. Repeat the operational checks for the valves in accordance with ASB 767- 29A0083, Revision 4, until the terminating action required by the Requirement 3 of this Directive is accomplished.\n\n    3. Replace the existing Circle Seal Controls valve (identified by Requirement 1), in accordance with ASB 767-29A0090, dated 7 December 2000.\n\nNote 2: FAA AD 2001-11-07 Amendment 39-12249 refers.\n\nNote 3: Operational checks done before the effective date of this Directive as per Boeing ASB 767-29A0083, Revision 2, dated 15 July 1999; meet Requirements 1 and 2 of this Directive.\n\nNote 4: Replacement of Circle Seal Controls valve done before the effective date of this Directive as per Boeing ASB 767-29A0083, Revision 2, dated 15 July 1999, meets the Requirement 3 of this Directive.","sortOrder":1}],"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"},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"This AD stays within the original safety-focused purpose: detect malfunctions in specified motor-operated hydraulic shutoff valves and require replacement as the corrective (terminating) action. It does not broaden its reach beyond that technical remedy. The directive relies on Boeing ASBs for procedural steps and accepts earlier compliance done under an earlier ASB revision; these are procedural clarifications rather than an expansion of scope."},"complexity_factors":["Short instrument (single-page style) with limited number of operative requirements (three Requirements).","References to external documents (Boeing ASB 767-29A0083 Rev 4 and ASB 767-29A0090) for procedural detail — requires users to consult other texts.","Conditional logic: (a) if malfunction found then replace prior to further flight; (b) repeat checks until terminating action completed.","Two grandfathering notes (Notes 3 and 4) that accept earlier work under ASB Revision 2 — adds a small conditional exception.","Cross-reference to FAA AD 2001-11-07 (Note 2) — indicates harmonisation but requires cross-check for technical context.","Limited defined scope (only motor-operated Circle Seal Controls valves in specified locations) — reduces complexity but requires operators to verify applicability against ASB location lists."],"plain_english_summary":"**What this directive does (mechanics)\n\n- Applies to: all Boeing 767 aeroplanes that have motor-operated hydraulic shutoff valves made by Circle Seal Controls and installed in the locations listed in the relevant Boeing alert service bulletin (ASB). (See Note 1.)\n\n- Required actions:\n  - Requirement 1: Perform an operational check of the affected motor-operated hydraulic shutoff valves following Boeing ASB 767-29A0083, Revision 4 (28 Sep 2000). If a valve malfunctions, it must be replaced with a new or serviceable Whittaker Controls or Circle Seal Controls valve before the aircraft flies again (\"prior to further flight\").\n  - Requirement 2: Keep repeating the operational checks per the ASB until the terminating action is done.\n  - Requirement 3 (terminating action): Replace the existing identified Circle Seal Controls valves in accordance with Boeing ASB 767-29A0090 (7 Dec 2000).\n\n- Term/credit for earlier work: Operational checks or replacements done before this AD using Boeing ASB 767-29A0083 Revision 2 are accepted as meeting the AD's Requirements 1–3 (Notes 3 and 4).\n\n- Cross-reference: The AD refers to FAA AD 2001-11-07 (Note 2) and relies on Boeing ASBs for the procedural detail.\n\nWho this affects and who pays\n\n- Primary parties affected: aircraft operators/owners of Boeing 767 series aeroplanes with the specified Circle Seal Controls motor-operated hydraulic shutoff valves, and maintenance organisations that carry out inspections and replacements.\n- Who pays: operators fund the operational checks, repeated checks (if required), any unscheduled downtime, and the cost to purchase and install replacement valves (Whittaker or Circle Seal Controls) and associated labour.\n- Who decides and enforces: the CASA delegate issued the AD under the CAR 1998 power cited in the heading; the AD mandates compliance with the Boeing ASBs referenced for the specific procedures.\n\nWhy the regulator requires this (stated purpose) and how that translates into action\n\n- The AD is issued to correct an identified unsafe condition related to the specified hydraulic shutoff valves. To do that it: (a) requires inspections (operational checks) to detect malfunction; (b) requires immediate replacement before further flight if a malfunction is found; and (c) requires eventual replacement of affected valves as the terminating fix.\n\nTesting the stated purpose against costs, incentives and practical effects\n\n- Direct costs and burdens: operators face inspection labour costs, potential repeated checks (Requirement 2), spare-part purchase and installation costs for replacements (Requirement 1 and 3), and possible aircraft downtime if a valve fails the check and must be replaced before flight.\n\n- Supplier and market effects: the AD specifies replacement with Whittaker Controls or Circle Seal Controls valves, which concentrates demand on those suppliers for replacement parts (Requirement 1 and 3). That creates predictable demand for those manufacturers and for maintenance suppliers who can install those parts.\n\n- Operational consequence: until the terminating action (Requirement 3) is completed for an aircraft, operators must continue recurring operational checks. That creates a continuing maintenance obligation and possible ongoing operational costs.\n\n- Implementation risks and constraints: the AD's success depends on availability of replacement valves and maintenance capacity to perform checks and replacements. If parts are scarce, operators may face scheduling delays or aircraft out-of-service time.\n\n- Discretion and procedures: the AD delegates the detailed inspection and replacement procedures to Boeing ASBs (ASB 767-29A0083 Rev 4 and ASB 767-29A0090). Operators must follow those external documents to comply; CASA enforces the AD rather than the ASB text directly.\n\nWhat behaviour changes the AD creates\n\n- Maintenance regimes change: affected 767 operators must add routine operational checks per the ASB, perform immediate replacements when a malfunction is found, and eventually replace all identified Circle Seal Controls valves per the terminating ASB.\n- Procurement choices: operators will need to acquire Whittaker Controls or Circle Seal Controls valves for replacements.\n\nKey references in the directive\n\n- Applicability and limitation: Note 1 limits the AD to motor-operated Circle Seal Controls valves installed in locations specified by the ASB.\n- Operational procedure: Requirement 1 and ASB 767-29A0083 Revision 4.\n- Terminating action: Requirement 3 and ASB 767-29A0090.\n- Grandfathering earlier work: Notes 3 and 4 accept earlier work done to Revision 2 of ASB 767-29A0083 as meeting the AD.\n\nConcise summary sentence\n\nOperators of Boeing 767s with specified Circle Seal Controls motor-operated hydraulic shutoff valves must perform recurring operational checks and, if a valve malfunctions, remove it before further flight and ultimately replace all identified Circle Seal Controls valves with Whittaker or Circle Seal Controls units as specified in Boeing ASBs; these measures shift inspection, replacement and parts‑cost burdens to operators and create continuing maintenance obligations until the replacement requirement is satisfied."},"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This is a discrete, time-bound safety directive addressing a specific mechanical defect. It has not expanded beyond its original purpose of addressing faulty hydraulic shutoff valves on Boeing 767 aircraft."},"complexity_factors":["Short, single-purpose document (3 requirements only)","Minimal defined terms (relies on external Boeing technical documents for detailed specifications)","Simple conditional structure: IF malfunction detected THEN replace before flight","Cross-references to external technical standards (Boeing ASBs and FAA AD) rather than internal legislative complexity","No nested exceptions or elaborate compliance timelines — just 'do this, then do that until terminated'"],"plain_english_summary":"This AD requires operators of Boeing 767s fitted with specific Circle Seal motor‑operated hydraulic shutoff valves to inspect and, if necessary, replace them per Boeing Alert Service Bulletin 767‑29A0083. It addresses a risk that valves could fail to isolate hydraulic systems in emergencies, potentially endangering passengers and crew.\n\nOperators must remove unserviceable valves and continue recurring checks until affected valves are replaced with approved parts; earlier compliance using Boeing’s July 1999 instructions is accepted."}},"importantCases":[],"_links":{"self":"/api/acts/ad-b767-147-hydraulic-shutoff-valves","history":"/api/acts/ad-b767-147-hydraulic-shutoff-valves/history","analysis":"/api/acts/ad-b767-147-hydraulic-shutoff-valves/analysis","conflicts":"/api/acts/ad-b767-147-hydraulic-shutoff-valves/conflicts","importantCases":"/api/acts/ad-b767-147-hydraulic-shutoff-valves/important-cases","documents":"/api/acts/ad-b767-147-hydraulic-shutoff-valves/documents"}}