{"id":"F2006B02835","name":"AD/B737/134 - Argo-Tech/TRW Fuel Boost Pumps","slug":"ad-b737-134-argo-tech-trw-fuel-boost-pumps","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":42177,"registerId":"commonwealth-F2006B02835-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.002.png)\n\n![](image.002.png)  \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 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.","sortOrder":0},{"sectionNumber":"AD/B737/134 Argo-Tech/TRW Fuel Boost Pum","sectionType":"part","heading":"AD/B737/134 Argo-Tech/TRW Fuel Boost Pumps 2/2000","content":"# AD/B737/134 Argo-Tech/TRW Fuel Boost Pumps 2/2000\n\nDM\n\nApplicability: Model 737-100, \\-200, \\-300, \\-400, and \\-500 series aeroplanes equipped with Argo- Tech/TRW (Thompson Ramo Wooldbridge) fuel tank boost pumps having part numbers (P/N) 258000-2, -3, and -5, or 382300-1, -2, and -3.\n\nRequirement: 1. Unless accomplished previously, perform a one-time detailed visual inspection to detect discrepant breather plugs (including loose, damaged, and missing plugs) in the fuel tank boost pumps in accordance with Boeing Telex M-7200-98-03173, dated 21 October 1998 or Boeing Alert Service Bulletin 737-28A1134, Revision 1, dated 10 June 1999.\n\nNote 1: For the purposes of this directive, a detailed visual inspection is defined as: \"An intensive visual examination of a specific structural area, system, installation, or assembly to detect damage, failure, or irregularity. Available lighting is normally supplemented with a direct source of good lighting at intensity deemed appropriate by the inspector. Inspection aids such as mirror, magnifying lenses etc, may be used. Surface cleaning and elaborate access procedures may be required.\"\n\n    2. If any discrepancy is detected, during the Requirement 1 inspection, either install a new breather plug in accordance with Temporary Revision No. 28-1 of the Argo- Tech Overhaul Manual, dated 13 November 1998, or the alert service bulletin; or replace the boost pump with a new or serviceable pump, in accordance with procedures specified in Section 28-22-41 of the Boeing 737 Airplane Maintenance Manual (AMM). After the effective date of this directive, only Section 28-22-41 of the Boeing 737 AMM, dated 1 May 1999, shall be used for replacement of the boost pump.\n\n    3. No person shall install on any Airplane an Argo-Tech/TRW fuel tank boost pump having the P/N 258000-2, -3, or -5; or 382300-1, -2, or -3; unless that pump has been inspected and applicable corrective actions have been performed in accordance with the requirements of this directive.\n\nNote 2: FAA AD 99-24-06 Amdt 39-11430 refers.\n\nCompliance: For Requirement 1:\n\nCentre and auxiliary fuel tank boost pumps \\- Within six months after the effective date 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"},"kimi_summary":{"content_quality":"ok","complexity_score":4,"scope_assessment":{"changed":false,"description":"This appears to be a standard, focused airworthiness directive addressing a specific known defect in specific aircraft equipment. The scope remains tightly constrained to the identified unsafe condition regarding breather plugs in Argo-Tech/TRW fuel boost pumps on Boeing 737 aircraft. There is no evidence of scope creep beyond the original safety purpose."},"complexity_factors":["Multiple cross-references to external technical documents (Boeing Telex, Alert Service Bulletin, Argo-Tech Overhaul Manual, Boeing AMM Section 28-22-41)","Specific part number identification required (P/N 258000-2, -3, -5 and 382300-1, -2, -3)","Conditional logic: Requirement 2 only applies 'if any discrepancy is detected' during Requirement 1","Date-sensitive compliance: different versions of technical manuals apply depending on timing (before/after 1 May 1999)","Nested applicability: applies only to specific aircraft models AND specific equipment configurations","Incorporated definition of 'detailed visual inspection' within the text itself"],"plain_english_summary":"This CASA Airworthiness Directive orders mandatory inspections and corrective action on Argo‑Tech/TRW fuel boost pumps installed on Boeing 737‑100 to ‑500 aircraft because breather plugs can become loose, damaged, or fall out. \n\nOperators and maintenance organizations must inspect, repair or replace faulty plugs or pumps and may not install affected pumps unless they’ve been inspected and fixed — a safety measure to prevent fuel-system failures, leaks, or fire risks."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The AD remains tightly focused on identifying and correcting discrepant breather plugs in the specified Argo‑Tech/TRW fuel boost pumps for particular Boeing 737 models. It does not broaden regulatory scope beyond that original safety purpose; the directive prescribes inspection, corrective action options, and an installation prohibition limited to the listed part numbers and models."},"complexity_factors":["Short, single‑issue directive (one‑time inspection plus corrective actions)","Explicit applicability limited to five Boeing 737 series and six pump part numbers","One defined inspection standard provided (detailed visual inspection)","Cross‑references to multiple external technical documents (Boeing Telex M-7200-98-03173; Boeing Alert Service Bulletin 737-28A1134 Rev 1; Argo‑Tech Overhaul Manual Temporary Revision No. 28-1; Boeing 737 AMM Section 28-22-41 and a required AMM revision dated 1 May 1999)","Simple conditional logic (unless previously accomplished; if discrepancy found then two corrective options)","A mandatory prohibition on installing affected pumps unless they have been inspected/corrected","Single compliance timeframe specified (within six months for centre and auxiliary pumps)"],"plain_english_summary":"**What this directive does (mechanically)**\n\n- Requires a one-time, detailed visual inspection of certain Argo‑Tech/TRW fuel tank boost pumps installed on Boeing 737‑100/‑200/‑300/‑400/‑500 series aircraft to check for discrepant breather plugs (loose, damaged or missing). (Requirement 1)\n- If a discrepancy is found, the pump must either have a new breather plug installed according to the Argo‑Tech Overhaul Manual temporary revision or the Boeing alert service bulletin, or the pump must be replaced with a new or serviceable unit following the Boeing 737 Airplane Maintenance Manual (AMM). After the AD takes effect, only the specified AMM section dated 1 May 1999 may be used for pump replacement. (Requirement 2)\n- Prohibits installing any of the listed Argo‑Tech/TRW pump part numbers on an airplane unless that pump has already been inspected and any required corrective action carried out under this AD. (Requirement 3)\n- Timing: the inspection must be completed within six months of the AD's effective date for centre and auxiliary fuel tank boost pumps. (Compliance)\n\n**Who is affected**\n\n- Operators and maintainers of Boeing 737‑100, ‑200, ‑300, ‑400 and ‑500 series aeroplanes that have Argo‑Tech/TRW fuel boost pumps with part numbers P/N 258000‑2, ‑3, ‑5 or 382300‑1, ‑2, ‑3 installed.\n- Maintenance organisations and technicians who perform inspections and repairs, and parts suppliers who supply breather plugs or replacement pumps.\n\n**Why it matters (official claim and practical implications)**\n\n- The AD's stated purpose is to detect and correct discrepant breather plugs in the specified fuel boost pumps. The AD is issued under the regulator's power to require actions necessary to correct an unsafe condition. (preamble / Requirement)\n\n- Practical effect: aircraft operators must allocate maintenance time and labour to carry out a one‑time intensive visual inspection (as defined in the directive). If pumps fail inspection, operators will either fit new breather plugs according to the specified overhaul instructions or replace pumps, incurring parts and labour costs and possible aircraft downtime.\n\n**Who pays, who decides, and what behaviour changes**\n\n- Who pays: aircraft operators/owners pay for the inspection work, any replacement breather plugs or replacement pumps, and any associated aircraft downtime. Maintenance organisations incur implementation effort and must use the specified manuals and procedures.\n- Who decides: the CASA delegate has issued the AD; operators and approved maintenance organisations decide how to schedule and perform the mandated inspections and corrective actions, but must follow the referenced Boeing/Argo‑Tech procedures as required by the AD.\n- Behavioural change required: perform the one‑time inspection within the six‑month window; follow the AD‑specified corrective procedures if discrepancies are found; do not install the specified pump part numbers unless they have been inspected and corrected under this AD.\n\n**Costs, incentives, trade‑offs and implementation risks**\n\n- Direct costs: labour for the inspection, cost of replacement breather plugs or pumps, and potential aircraft out‑of‑service time. These are concentrated on affected operators and maintenance providers.\n- Supply and timing risk: if many operators need replacement pumps or plugs, parts availability or shop capacity could delay repairs and extend aircraft downtime.\n- Incentives: operators facing tight schedules may opt to replace pumps rather than perform detailed inspections to avoid uncertain findings; suppliers of pumps and overhaul services may see increased demand.\n- Compliance burden: the AD cross‑references several external documents (Boeing telex/alert service bulletin, Argo‑Tech Overhaul Manual temporary revision, Boeing AMM). Compliance therefore requires access to those specific technical publications and to qualified maintenance personnel. The AD also mandates using a specific AMM revision for replacements after the effective date, which limits procedural flexibility.\n- Enforcement and substitution: regulators enforce compliance through standard airworthiness oversight; operators must keep records demonstrating the inspection and any corrective action. There is a low likelihood of broader market effects beyond the affected operators and maintenance supply chain because the AD is narrowly targeted by model and part number.\n\n**Relation to other directives**\n\n- The AD notes an equivalent FAA directive (FAA AD 99‑24‑06). This means operators complying with this AD are required to meet substantially the same corrective actions as under that FAA AD, but must follow the Australian AD's procedural and timing requirements.\n\n**Bottom line**\n\n- This is a narrowly targeted safety directive obliging operators of certain Boeing 737 variants to carry out a one‑time, specified inspection of particular Argo‑Tech/TRW fuel boost pumps within six months, to repair or replace pumps with discrepant breather plugs, and to prohibit installation of uninspected pumps. The costs fall on operators and maintenance providers; compliance requires following several specific technical documents and may cause short‑term parts or shop capacity pressures."}},"importantCases":[],"_links":{"self":"/api/acts/ad-b737-134-argo-tech-trw-fuel-boost-pumps","history":"/api/acts/ad-b737-134-argo-tech-trw-fuel-boost-pumps/history","analysis":"/api/acts/ad-b737-134-argo-tech-trw-fuel-boost-pumps/analysis","conflicts":"/api/acts/ad-b737-134-argo-tech-trw-fuel-boost-pumps/conflicts","importantCases":"/api/acts/ad-b737-134-argo-tech-trw-fuel-boost-pumps/important-cases","documents":"/api/acts/ad-b737-134-argo-tech-trw-fuel-boost-pumps/documents"}}