{"id":"F2005L02046","name":"AD/V2500/2 - Fuel Filter Cover","slug":"ad-v2500-2-fuel-filter-cover","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":36208,"registerId":"commonwealth-F2005L02046-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"International Aero Engines AG V2500 seri","sectionType":"division","heading":"International Aero Engines AG V2500 series","content":"### International Aero Engines AG V2500 series\n\n| AD/V2500/2 | Fuel Filter Cover | 9/2005 |\n| ---------- | ----------------- | ------ |\n\n| Applicability: | International Aero Engines (IAE) V2500-A1 and V2500-A5 series engines.Note 1: These engines are installed in, but not limited to, Airbus A319, A320 and A321 series aircraft.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        |\n| -------------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement:   | 1. Inspect the area of the fuel filter cover of the Fuel Cooled Oil Cooler (FCOC) in accordance with Service Bulletin (SB) IAE 79-0085 dated 19 June 2002, and for non modified V2500-A5 engines in accordance with SB IAE 79-0086 dated 8 August 2002.(a) If fuel leakage is observed, comply with instructions of All Operator Wire (AOW) 1048.2. For V2500-A1 engines modify the FCOC in accordance with Service Bulletin IAE 79-0085, or later DGAC approved revision.3. For V2500-A5 engines having a Serial Number lower than V11375, modify the FCOC in accordance with Service Bulletin IAE 79-0086, or later DGAC approved revision.Note 2: At every other opening of the fuel filter cover strictly apply the procedures detailed in the Aircraft Maintenance Manual (AMM).Note 3: EASA AD 2005-0012 approval number 2005-3459 dated 15 April 2005 refers. |\n| Compliance:    | 1. Unless previously accomplished, within 500 flight hours after the effective date of this Directive.(a) Before further flight.2. No later than 31 December 2005 or at the next removal of the FCOC alone or installed on a higher assembly.3. No later than 31 December 2005 or at the next removal of the FCOC alone or installed on a higher assembly.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           |\n|                | This Airworthiness Directive becomes effective on 1 September 2005.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  |\n\n| Background: | Over tightening of the bolts retaining the fuel filter cover on the FCOC has led to heavy fuel loss on two aeroplanes. This Directive requires an inspection of the fuel cover leaks and modification of the FCOC to prevent fuel leakage from the FCOC. |\n| ----------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n\n![](image.001.png)  \nDavid Villiers  \nDelegate of the Civil Aviation Safety Authority\n\n21 July 2005","sortOrder":0},{"sectionNumber":"AD/V2500/2","sectionType":"part","heading":"AD/V2500/2","content":"## AD/V2500/2","sortOrder":1},{"sectionNumber":"Fuel Filter Cover","sectionType":"part","heading":"Fuel Filter Cover","content":"## Fuel Filter Cover","sortOrder":2},{"sectionNumber":"9/2005","sectionType":"part","heading":"9/2005","content":"## 9/2005","sortOrder":3}],"analysis":{"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. The scope remains tightly focused on the fuel filter cover issue as originally identified."},"complexity_factors":["Multiple compliance deadlines with conditional triggers (flight hours vs calendar dates vs maintenance events)","Different requirements for two engine sub-types (V2500-A1 vs V2500-A5) with different serial number cutoffs","Cross-references to external technical documents (Service Bulletins IAE 79-0085 and 79-0086, All Operator Wire 1048, Aircraft Maintenance Manual)","Nested conditional logic: inspection findings trigger immediate action (before further flight)","Reference to foreign regulatory approval (DGAC - French aviation authority, EASA AD 2005-0012)"],"plain_english_summary":"This CASA Airworthiness Directive mandates inspection of the Fuel Cooled Oil Cooler (FCOC) fuel‑filter cover for leaks and modification of affected IAE V2500 engines to stop leaks caused by over‑tightened bolts. It applies to operators and maintenance organisations using V2500‑A1/A5 engines (V2500‑A5 engines with serials below V11375 require modification). The action prevents dangerous fuel loss and fire risk after two reported heavy‑fuel leaks."},"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"},"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":false,"description":"This Directive is tightly focused on preventing fuel leakage from the FCOC fuel filter cover caused by over‑tightening of the retaining bolts. It requires inspection and targeted modification for specified engine models/serials. The instrument stays within that original safety remit and does not broaden its scope to unrelated systems, aircraft types, or operational restrictions."},"complexity_factors":["Multiple external documents referenced (IAE SB 79-0085; IAE SB 79-0086; AOW 1048.2; AMM; EASA AD) creating dependence on external procedural detail","Conditional applicability by engine model and serial number (V2500-A1 vs V2500-A5; A5 serials < V11375)","Different compliance windows and an immediate-action clause (inspect within 500 flight hours; before further flight if leak observed; modification by 31 Dec 2005 or at next FCOC removal)","Operator action split between inspection and mandated modification (two-step compliance)","Cross-approval language (acceptance of later DGAC-approved revisions), adding regulatory cross-reference complexity","Notes specifying AMM procedures for other openings add operational detail and potential variation based on maintenance practice"],"plain_english_summary":"**What this instrument does (mechanical change)**\n\n- Requires operators of International Aero Engines (IAE) V2500-A1 and V2500-A5 series engines to inspect the area around the fuel filter cover of the Fuel Cooled Oil Cooler (FCOC) and, for certain engines, to modify the FCOC to stop fuel leakage.\n- Inspections and modifications must be done following specific IAE Service Bulletins (SB IAE 79-0085 and SB IAE 79-0086) and, if leakage is found, operators must follow All Operator Wire (AOW) 1048.2 for immediate action.\n\n**Who this affects**\n\n- Airlines and other aircraft operators that use IAE V2500-A1 or V2500-A5 engines (for example, many Airbus A319/A320/A321 operators).\n- Maintenance organisations and engineers who perform engine inspections, repairs and SB-modification work.\n\n**What you must do (practical steps)**\n\n- Inspect the fuel filter cover area of the FCOC in accordance with SB IAE 79-0085 (all V2500-A1 and modified A5 engines) or SB IAE 79-0086 (non-modified V2500-A5 engines), dated as specified in the directive.\n- If fuel leakage is observed during inspection, take the immediate corrective actions specified in AOW 1048.2 (this typically means addressing the leak before further flight).\n- Modify the FCOC as required: for V2500-A1 engines follow SB IAE 79-0085; for V2500-A5 engines with serial numbers lower than V11375 follow SB IAE 79-0086 (or later DGAC-approved revisions).\n- For any other opening of the fuel filter cover, use the procedures in the Aircraft Maintenance Manual (AMM).\n\n**Required timing (deadlines and windows)**\n\n- If not already done: perform the inspection within 500 flight hours after the directive’s effective date, unless leakage is found (in which case action before further flight is required).\n- Modifications for the affected engines must be done no later than 31 December 2005, or at the next removal of the FCOC (either alone or as part of a higher assembly), whichever occurs first.\n\n**Why the regulator requires this**\n\n- The stated reason is that over-tightening the bolts retaining the fuel filter cover on the FCOC led to two events of heavy fuel loss. The directive’s stated purpose is to detect leaks and require modifications that prevent leakage from the FCOC.\n\n**Costs, incentives and trade-offs (practical testing of the stated purpose)**\n\n- Who pays: operators pay inspection and modification labour, parts, and any aircraft downtime. Maintenance organisations carry out the work and supply labour and parts.\n- Incentives and behaviour change: operators are incentivised to inspect promptly and either perform the modification or schedule it at the next convenient engine removal. There is also an implicit operational incentive to adopt correct bolt torque and AMM procedures to avoid recurrence.\n- Compliance burden: the directive references external technical documents (SBs, AOW, AMM) which define the detailed procedures; that creates dependency on parts availability, workshop capacity and potential scheduling disruption when an engine or FCOC must be removed.\n- Implementation risk and opportunity cost: if many operators schedule removals before the deadline, maintenance capacity may become constrained; operators face trade-offs between doing the modification at the next planned engine removal (lower immediate downtime) versus earlier removal to meet the absolute deadline.\n- Effects on private enterprise and competition: all operators of the specified engine models face the same technical requirement. Smaller operators with less spare-engine capacity may experience relatively higher marginal costs from engine removals or unscheduled downtime. Maintenance providers may capture additional servicing work.\n- Regulatory discretion and cross-references: the directive makes compliance contingent on following specified SBs and DGAC-approved revisions, which places operational reliance on manufacturer and foreign authority documents (possible coordination and approval lags).\n\n**Concrete implementation notes**\n\n- The AD refers to SB IAE 79-0085 and SB IAE 79-0086 and to AOW 1048.2 for immediate corrective action; it also notes an EASA AD reference and that later DGAC-approved revisions to the SBs are acceptable.\n- The directive treats different engine sub-series and serial-number ranges differently (V2500-A1 vs V2500-A5; A5 engines with serial number lower than V11375). That requires operators to check engine serial numbers and maintenance history before deciding which SB or modification applies.\n\n(References in the directive: Applicability; Requirement; Compliance; Background.)"}},"importantCases":[],"_links":{"self":"/api/acts/ad-v2500-2-fuel-filter-cover","history":"/api/acts/ad-v2500-2-fuel-filter-cover/history","analysis":"/api/acts/ad-v2500-2-fuel-filter-cover/analysis","conflicts":"/api/acts/ad-v2500-2-fuel-filter-cover/conflicts","importantCases":"/api/acts/ad-v2500-2-fuel-filter-cover/important-cases","documents":"/api/acts/ad-v2500-2-fuel-filter-cover/documents"}}