{"id":"F2007L00698","name":"AD/B767/229 - Main Tank Fuel Boost Pump Flame Arrestor","slug":"ad-b767-229-main-tank-fuel-boost-pump-flame-arrestor","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":64277,"registerId":"commonwealth-F2007L00698-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Boeing 767 Series Aeroplanes","sectionType":"division","heading":"Boeing 767 Series Aeroplanes","content":"### Boeing 767 Series Aeroplanes\n\n| AD/B767/229 | Main Tank Fuel Boost Pump Flame Arrestor | 4/2007 |\n| ----------- | ---------------------------------------- | ------ |\n\n| Applicability: | Boeing Model 767-200, -300, -300F, and -400ER series aeroplanes.                                                                                                          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|\n| Requirement:   | 1. Except as provided by the optional terminating action; do a detailed inspection of each main tank fuel boost pump to determine if the pump shaft flame arrestor is installed, a measurement of the flame arrestor's position in the pump, and all applicable corrective actions, by accomplishing all the actions specified in the Accomplishment Instructions of Boeing Alert Service Bulletin (ASB)767-28A0077 (for Model 767-200, -300, and -300F series aeroplanes) or Boeing ASB 767-28A0081 (for Model 767-400ER series aeroplanes), both Revision 1, both dated 8 July 2004, as applicable.Inspections accomplished before the effective date of this AD in accordance with Boeing ASB 767-28A0077, dated 6 March 2003; or Boeing ASB 767-28A0081, dated 6 March 2003; are considered acceptable for compliance with the corresponding actions specified in Requirement 1 and 3 of this AD.Note 1: Boeing Alert Service Bulletins 767-28A0077 and 767-28A0081 reference Hamilton Sundstrand Service Bulletin 5006003-28-2, dated 25 October 2002, as an additional source of service information for accomplishment of the inspection and corrective actions. Although the Hamilton Sundstrand service bulletin specifies to return main tank fuel boost pumps with damaged, broken, or out- of-position flame arrestors to a repair shop, that action is not required by this AD.Note 2: For the purposes of this AD, a detailed inspection is: \"An intensive examination of a specific item, installation, or assembly to detect damage, failure, or irregularity. Available lighting is normally supplemented with a direct source of good lighting at an intensity deemed appropriate. Inspection aids such as mirror, magnifying lenses, etc., may be necessary. Surface cleaning and elaborate procedures may be required.''2. Replace the left and right main tank fuel boost pumps with new or modified pumps in accordance with the Accomplishment Instructions of Boeing Alert Service Bulletin 767-28A0088 (for Model 767-200, -300, and -300F series aeroplanes) or Boeing Alert Service Bulletin 767- 28A0089 (for Model767-400ER series aeroplanes), both dated 24 February 2005, as applicable. |\n\n|             | Optional Terminating Action--Records ReviewFor any period when the part number (P/N) of a main tank fuel boost pump installed on any aeroplane, as conclusively determined from a review of aeroplane maintenance records, is P/N 5006003D, no further action is required by Requirement 1 of this AD for that pump only.Accomplishment of the replacement terminates the repetitive measurement detailed in Requirement 1 of this AD for that pump only.Note 3: Boeing Alert Service Bulletins 767-28A0088 and 767- 28A0089 reference Hamilton Sundstrand Service Bulletin 5006003-28-3, dated 8 December 2004, as the appropriate source of service information for modifying the pump.3. Only main tank fuel boost pumps identified in paragraphs (a) and (b) below may be installed on any aeroplane.(a) Any main tank fuel boost pump that has been inspected, and on which all applicable corrective actions have been performed, in accordance with Requirement 1 of this AD.(b) Any main tank fuel boost pump having P/N 5006003D.Note 4: FAA AD 2007-04-16 Amdt 39-14948 dated 5 February 2007 refers.                                                                            |\n| ----------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |\n| Compliance: | 1. For aeroplanes having line numbers (L/Ns) 1 through 914 inclusive:Within 12 months after the effective date of this AD, thereafter at intervals not to exceed the applicable time specified in paragraphs (a) or (b) below, until the replacement required by Requirement 2 of this AD is accomplished. All applicable corrective actions must be done before further flight.(a) For aeroplanes that have accumulated more than 15,000 total flight hours as of the date the initial actions are done in accordance with Requirement 1 of this AD: Repeat the measurement thereafter at intervals not to exceed 6,000 flight hours or 24 months, whichever comes first.(b) For aeroplanes that have accumulated 15,000 total flight hours or fewer as of the date the initial actions are done in accordance with Requirement 1 of this AD: Within 12 months after the date on which the aeroplane accumulates 15,000 total flight hours or within 24 months after performing the initial inspection required by Requirement 1 of this AD, whichever occurs later. Repeat the measurement thereafter at intervals not to exceed 6,000 flight hours or 24 months, whichever comes first. |\n\n|             | For aeroplanes having L/Ns 915 and on:For aeroplanes that have accumulated more than 15,000 total flight hours as of the effective date of this AD, do the actions within 12 months after the effective date of this AD. All applicable corrective actions must be done before further flight.For aeroplanes that have accumulated 15,000 total flight hours or fewer as of the effective date of this AD, do the actions within 12 months after the date on which the aeroplane accumulates 15,000 total flight hours.Thereafter at intervals not to exceed 6,000 flight hours or 24 months, whichever comes first, until the replacement required by Requirement 2 of this AD is accomplished.Note 5: Any inspection/measurement of the pumps on the left and right main fuel tanks may be done separately provided that the actions are done on all pumps within the compliance time specified in this AD.2. Within 36 months after the effective date of this AD.Note 6: Any replacement of the pumps on the left and right main fuel tanks may be done separately provided that all pumps are replaced within the compliance time specified.3. From the effective date of this AD. |\n| ----------- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n|             | This Airworthiness Directive becomes effective on 12 April 2007.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        |\n| Background: | This AD results from reports that certain fuel boost pumps may not have flame arrestors installed in the pump shaft and reports that the pin that holds the flame arrestor in place can break due to metal fatigue. The issuing of this AD is to prevent the possible migration of a flame from a main tank fuel boost pump inlet to the vapour space of that fuel tank, and consequent ignition of fuel vapours, which could result in a fire or explosion.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            |\n\n![](image.001.png)  \nDavid Punshon  \nDelegate of the Civil Aviation Safety Authority\n\n23 February 2007","sortOrder":0},{"sectionNumber":"AD/B767/229","sectionType":"part","heading":"AD/B767/229","content":"## AD/B767/229","sortOrder":1},{"sectionNumber":"Main Tank Fuel Boost Pump Flame Arrestor","sectionType":"part","heading":"Main Tank Fuel Boost Pump Flame Arrestor","content":"## Main Tank Fuel Boost Pump Flame Arrestor","sortOrder":2},{"sectionNumber":"4/2007","sectionType":"part","heading":"4/2007","content":"## 4/2007","sortOrder":3}],"analysis":{"flash_summary":{"complexity_score":7,"scope_assessment":{"changed":false,"description":"The AD remains focused on its original safety purpose: ensuring flame arrestors are present and correctly positioned and removing pumps that present risk. The instrument adds enforcement and compliance mechanisms (repetitive inspections until replacement, an optional records-review terminating action, and an installation restriction) but these are refinements to achieve the same safety objective rather than a material expansion of scope beyond that original intent."},"complexity_factors":["Multiple aeroplane variants covered (767-200, -300, -300F, -400ER) with variant-specific service bulletins","Different Boeing Alert Service Bulletins (ASBs) cited for inspection and replacement, including earlier and revised editions","Conditional compliance timing based on line number ranges (L/N 1–914 vs L/N 915 and on) and on total accumulated flight hours (> or <= 15,000 hours)","Repetitive inspection intervals specified as either flight hours (6,000 FH) or calendar time (24 months), whichever occurs first","Optional terminating action via records review (P/N 5006003D) and interaction between inspections and replacements (replacement terminates repetitive inspections)","Installation restriction after the AD takes effect: only inspected/corrected pumps or P/N 5006003D may be installed","Acceptance of pre-effective inspections done under older ASB editions (exceptions to the default requirement)","Notes that reference additional manufacturer service information (Hamilton Sundstrand) but explicitly disallow some manufacturer-recommended actions as mandatory (adds interpretation steps)","Technical requirement for a 'detailed inspection' with a supplied definition (inspection complexity and potential need for special aids)","Multiple cross-references within the AD (Requirements 1–3, Compliance paragraphs, various Notes)"],"plain_english_summary":"**What this instrument does**\n\n- Applies to Boeing 767-200, -300, -300F and -400ER aeroplanes.\n- Requires operators to inspect the main tank fuel boost pumps to confirm a flame arrestor (a small device fitted to the pump shaft to stop a flame travelling from the pump into the fuel tank vapour space) is present and correctly positioned, to carry out corrective actions if it is missing or out of position, and ultimately to replace the pumps with a modified or new part.\n\n**Key actions required (mechanics of the rule)**\n\n- Detailed inspection: Each main tank fuel boost pump must be inspected to determine if a pump-shaft flame arrestor is installed and whether it is in the correct position. Corrective actions identified in Boeing Alert Service Bulletins (ASBs) must be performed. (This is the AD’s Requirement 1; the AD accepts certain earlier ASB inspections done before the AD’s effective date as compliant.)\n\n- Repeat measurements: Until the pumps are replaced, the measurement/inspection must be repeated on a regular schedule (see compliance timing below). All corrective actions must be completed before the aeroplane flies again.\n\n- Replacement (terminating action): Within 36 months, the left and right main tank fuel boost pumps must be replaced with new or modified pumps in accordance with the Boeing ASBs specified in the AD. Performing that replacement ends the need for the repetitive measurements for those pumps. (This is Requirement 2.)\n\n- Installation restriction: After the AD is effective, only pumps that have been inspected and corrected under Requirement 1, or pumps with part number (P/N) 5006003D, may be installed on the aeroplane. (Requirement 3.)\n\n- Optional records review: If maintenance records conclusively show a pump installed is P/N 5006003D, an operator may use that records review to avoid the inspection requirement for that pump. The records-review outcome applies only to the pump for which the records show that part number.\n\n**Compliance timing (practical summary)**\n\n- Initial inspection window: Generally within 12 months after the AD’s effective date for most aircraft, with some variation depending on the aircraft line number and accumulated flight hours (the AD separates L/N 1–914 from L/N 915 and on, and further adjusts timings depending on whether the aircraft has more or fewer than 15,000 total flight hours).\n\n- Repeat frequency until replacement: Every 6,000 flight hours or every 24 months, whichever occurs first, until the pump replacement is done.\n\n- Replacement deadline: All pumps must be replaced within 36 months of the AD’s effective date.\n\n**Why the AD exists (stated safety reason)**\n\n- Reports indicated some boost pumps either lacked the flame arrestor or had the arrestor retained by a pin that could break from metal fatigue. A missing or displaced arrestor could allow a flame to migrate from the pump inlet into the fuel tank vapour space and ignite fuel vapours. The AD’s stated purpose is to prevent that ignition risk.\n\n**Who pays and who decides**\n\n- Operators (airlines/owners) pay for the inspections, corrective work, record searches, and the eventual pump replacements and associated aircraft downtime. Maintenance organisations or repair stations carry out the work following the Boeing/Hamilton Sundstrand service information referenced.\n\n- The regulator (the Civil Aviation Safety Authority in Australia, via this AD) mandates the actions and enforces compliance. Boeing and the pump manufacturer (Hamilton Sundstrand) supply the service procedures and modification designs cited by the AD.\n\n**Costs, incentives and trade-offs (practical implications)**\n\n- Direct costs: Labour for initial and recurring inspections, possible corrective repair work, procurement and installation of replacement pumps, and aircraft out-of-service time during these activities.\n\n- Potential concentrated benefits: Maintenance providers and parts suppliers will receive business for pump inspections, corrections and replacements; operators who already have P/N 5006003D pumps documented in their records may avoid some work.\n\n- Administrative burden: Operators must maintain or produce conclusive maintenance records if they wish to rely on the optional records-review terminating action. The AD also accepts certain pre-AD inspections done under earlier ASBs, which reduces workload for operators who already complied.\n\n- Implementation risk and technical difficulty: The AD requires a ‘‘detailed inspection’’ (the AD defines this) and a measurement of the arrestor’s position; accurate measurement and interpretation may need specialised tools, lighting, and access. There is some discretion in corrective actions because the AD references external service bulletins for the exact procedures.\n\n- Operational trade-off: Safety improvement from eliminating the missing/mis-positioned arrestors versus cost and aircraft downtime for repeated inspections and replacement.\n\n**Mechanisms that change operator behaviour**\n\n- Operators must schedule inspections at the stated intervals and plan to procure and fit new/modified pumps within 36 months. They may search historical maintenance records to avoid inspecting pumps proven to be P/N 5006003D. They must also ensure only inspected/corrected pumps or P/N 5006003D pumps are installed going forward.\n\n**References used by the AD**\n\n- The AD mandates compliance with specific Boeing Alert Service Bulletins (different ASBs for -200/-300/-300F and -400ER variants) and references Hamilton Sundstrand service bulletins as additional source information. The AD explicitly states that returning damaged pumps to a repair shop, as suggested in the Hamilton Sundstrand bulletin, is not required by the AD (this narrows mandatory repair options)."},"kimi_summary":{"content_quality":"ok","complexity_score":6,"scope_assessment":{"changed":false,"description":"This AD maintains its original scope as a targeted safety directive addressing a specific mechanical defect in Boeing 767 fuel boost pumps. The document does not show evidence of scope creep; it remains focused on the flame arrestor issue described in the background section."},"complexity_factors":["Multiple aircraft variants with different service bulletins (767-200/-300/-300F use ASB 767-28A0077; 767-400ER uses ASB 767-28A0081)","Tiered compliance schedule based on aircraft line numbers (L/Ns 1-914 vs 915+) and accumulated flight hours (above/below 15,000 hours)","Cross-references to four separate Boeing Alert Service Bulletins and one Hamilton Sundstrand Service Bulletin","Conditional logic for repetitive inspections vs terminating actions","Optional terminating action based on records review with specific part number identification (P/N 5006003D)","Nested definitions (detailed inspection defined in Note 2)","Multiple notes (6 total) that modify or clarify requirements without being formally integrated into the numbered requirements","Separate compliance timelines for left and right pumps allowing asynchronous completion"],"plain_english_summary":"This CASA Airworthiness Directive orders Australian operators of Boeing 767s to inspect and ultimately replace main-tank fuel boost pumps because some pumps lack or have fatigue-prone flame arrestor retention pins, creating an ignition risk in the fuel vapour space. It affects owners, operators and maintenance organisations and requires timely inspections and pump replacement to eliminate a potential fire or explosion hazard."},"flash_summary_failed":{"failed":true,"reason":"A positive credit balance is required for all requests, including BYOK, so fallback providers remain available. Add credits at https://vercel.com/d?to=%2F%5Bteam%5D%2F%7E%2Fai%3Fmodal%3Dtop-up to continue.","source":"analysis-cron"}},"importantCases":[],"_links":{"self":"/api/acts/ad-b767-229-main-tank-fuel-boost-pump-flame-arrestor","history":"/api/acts/ad-b767-229-main-tank-fuel-boost-pump-flame-arrestor/history","analysis":"/api/acts/ad-b767-229-main-tank-fuel-boost-pump-flame-arrestor/analysis","conflicts":"/api/acts/ad-b767-229-main-tank-fuel-boost-pump-flame-arrestor/conflicts","importantCases":"/api/acts/ad-b767-229-main-tank-fuel-boost-pump-flame-arrestor/important-cases","documents":"/api/acts/ad-b767-229-main-tank-fuel-boost-pump-flame-arrestor/documents"}}