{"id":"F2008L02896","name":"AD/V2500/5 - No. 4 Bearing Oil System Components","slug":"ad-v2500-5-no-4-bearing-oil-system-components","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":74796,"registerId":"commonwealth-F2008L02896-current","compilationNumber":null,"startDate":"2026-04-02","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/V2500/5 | No. 4 Bearing Oil System Components | 9/2008 |\n| ---------- | ----------------------------------- | ------ |\n\n```html\n

Applicability:

International Aero Engines AG (IAE): IAE V2500-A1, V2522-A5, V2524-A5, V2527-A5, V2527E-A5, V2527M-A5, V2530-A5, V2533-A5, V2525-D5, and V2528-D5 turbofan engines with a part listed by part number (P/N) in this AD installed.

Note 1: These engines are installed on, but not limited to, Airbus A319, A320, A321, and McDonnell Douglas MD-90 aeroplanes.

Requirement:

1. V2500-A1 Engines:

For V2500-A1 engines, remove the parts listed by P/N in the following Table 1 of this AD. The ATA chapter reference of the IAE V2500-A1 engine manual
(E-V2500- 1IA) contains information on removing the parts.

Table 1. - V2500-A1 Parts To Be Removed

ATA chapter
reference

P/N

Nomenclature

72-42-20

2A0367-01

Tube Assy of, Weep, No. 4 Bearing Outer.

72-42-20

2A2873-01

Tube Assy of, Weep, No. 4 Bearing Outer.

72-42-20

2A0830-01

Tube, Scavenge, No. 4 Bearing Assy.

72-42-20

2A1949-01

Tube, Scavenge, No. 4 Bearing Assy.

72-42-20

2A2028-01

Tube, Scavenge, No. 4 Bearing Assy.

72-42-20

2A0830-001

Tube, Scavenge, No. 4 Bearing Assy.

72-42-20

2A2274-01

Tube, Scavenge, No. 4 Bearing Assy.

72-42-33

2A0853

Seal Assy, No. 4 Bearing, Front.

72-42-33

2A2055

Seal Assy, No. 4 Bearing, Front.

72-42-33

2A2834

Seal Assy, No. 4 Bearing, Front.

72-42-33

2A2930

Seal Assy, No. 4 Bearing, Front.

72-42-33

2A3525

Seal Assy, No. 4 Bearing, Front.

72-42-33

2A3538

Seal Assy, No. 4 Bearing, Front.

72-42-33

2A0851

Support Assy, No. 4 Bearing Seal.

72-42-33

2A2833

Support, No. 4 Bearing, Seal Assy.

72-42-33

2A3537

Support, No. 4 Bearing Seal Assy.

72-42-35

2A0892-01

Duct Assy, Cooling Air, No. 4 Bearing, Front.

72-42-35

2A2257-01

Duct Assy, Cooling Air, No. 4 Bearing, Front.

72-43-20

2A2056

Seal Assy, No. 4 Bearing, Rear.

72-43-20

2A2931

Seal Assy, No. 4 Bearing, Rear.

72-43-20

2A3526

Seal Assy, No. 4 Bearing, Rear.

72-43-20

2A0847

Seal Ring Holder.

72-43-20

2A0891-01

Duct Assy, Cooling Air, No. 4 Bearing, Rear.

72-43-20

2A1205-01

Duct Assy, Cooling Air, No. 4 Bearing, Rear.

72-43-20

2A3078-01

Duct Assy, Cooling Air, No. 4 Bearing, Rear.

72-45-11

2A0594

Metering Plug, HPT Hub, Stage 1.

72-45-11

2A1040

Metering Plug, HPT Hub, Stage 1.

72-45-11

2A2181

Metering Plug, HPT Hub, Stage 1.

72-45-13

2A0884

Seal Air, HPT Stage 1.

72-45-13

2A1203

Seal Air, HPT Stage 1.

72-45-13

2A0884-001

Seal Air, HPT Stage 1.

79-22-49

5R8111

Tube A/O Oil-No. 4 Brg Scav Dif Case to Bif Panel.

79-22-49

5R8138

Tube A/O Oil-No. 4 Brg Scav Dif Case to Bif Panel.

79-22-49

6A5367

Tube A/O Oil-No. 4 Brg Scav Dif Case to Bif Panel.

79-22-49

5A9083

Tube A/O Oil-No. 4 Brg Discon to Discon.

79-22-49

5A9084

Tube A/O Oil-No. 4 Brg Discon to Scav Valve.

79-22-49

5A8573

Tube A/O Oil-Press ‘T’ To Pressure Transducer.

79-23-51

1648MK2

Scavenge Valve.

2. V2522-A5, V2524-A5, V2527-A5, V2527E-A5, V2527M-A5, V2530-A5, and V2533-A5 Engines:

For V2522-A5, V2524-A5, V2527-A5, V2527E-A5, V2527M-A5, V2530-A5, and V2533-A5 engines, remove the parts listed by P/N in the following Table 2 of this AD. The ATA chapter reference of the IAE V2500-A5 engine manual
(E-V2500-1IA) contains information on removing the parts.

\n```\n\n```html\n

Table 2. - V2522-A5, V2524-A5, V2527-A5, V2527E-A5,
V2527M-A5, V2530-A5, and V2533-A5 Parts To Be Removed

ATA chapter
reference

P/N

Nomenclature

72-42-20

2A0367-01

Tube Assy of, Weep, No. 4 Bearing Outer.

72-42-20

2A2873-01

Tube Assy of, Weep, No. 4 Bearing Outer.

72-42-33

2A2055

Seal Assy, No. 4 Bearing, Front.

72-42-33

2A2834

Seal Assy, No. 4 Bearing, Front.

72-42-33

2A2930

Seal Assy, No. 4 Bearing, Front.

72-42-33

2A3525

Seal Assy, No. 4 Bearing, Front.

72-42-33

2A3538

Seal Assy, No. 4 Bearing, Front.

72-42-33

2A0851

Support Assy, No. 4 Bearing Seal.

72-42-33

2A2833

Support, No. 4 Bearing, Seal Assy.

72-42-33

2A3537

Support, No. 4 Bearing Seal Assy.

72-42-35

2A0892-01

Duct Assy, Cooling Air, No. 4 Bearing, Front.

72-42-35

2A2257-01

Duct Assy, Cooling Air, No. 4 Bearing, Front.

72-43-20

2A2056

Seal Assy, No. 4 Bearing, Rear.

72-43-20

2A2931

Seal Assy, No. 4 Bearing, Rear.

72-43-20

2A3526

Seal Assy, No. 4 Bearing, Rear.

72-43-20

2A0847

Seal Ring Holder.

72-43-20

2A0891-01

Duct Assy, Cooling Air, No. 4 Bearing, Rear.

72-43-20

2A1205-01

Duct Assy, Cooling Air, No. 4 Bearing, Rear.

72-43-20

2A3078-01

Duct Assy, Cooling Air, No. 4 Bearing, Rear.

72-45-11

2A0594

Metering Plug, HPT Hub, Stage 1.

72-45-11

2A1040

Metering Plug, HPT Hub, Stage 1.

72-45-11

2A2354

Metering Plug, HPT Hub, Stage 1.

72-45-11

2A3182

Metering Plug, HPT Hub, Stage 1.

72-45-13

2A1352

Seal Air, HPT Stage 1.

72-45-13

2A3032

Seal Air, HPT Stage 1.

79-22-49

5R8138

Tube A/O Oil-No. 4 Brg Scav Dif Case to Bif Panel.

\n```\n\n```html\n

79-22-49

6A5367

Tube A/O Oil-No. 4 Brg Scav Dif Case to Bif Panel.

79-22-49

5A9083

Tube A/O Oil-No. 4 Brg Discon to Discon.

79-22-49

5A9084

Tube A/O Oil-No. 4 Brg Discon to Scav Valve.

79-22-49

5A8573

Tube A/O Oil-Press ‘T’ To Pressure Transducer.

For V2522-A5, V2524-A5, V2527-A5, V2527E-A5, V2527M-A5, V2530-A5, and V2533-A5 engines with HPT stage 1 rotor assembly, P/Ns 2A9521-002 and
2A9621-002, the stage 1 HPT hub metering plug, P/N 2A3182, does not need to be removed.

3. V2525-D5 and V2528-D5 Engines

For V2525-D5 and V2528-D5 engines, remove the parts listed by P/N in the following Table 3 of this AD. The ATA chapter reference of the IAE V2500-D5 engine manual (E-V2500-3IA) contains information on removing the parts.

Table 3. - V2525-D5 and V2528-D5 Parts To Be Removed

ATA chapter
reference

P/N

Nomenclature

72-42-20

2A0367-01

Tube Assy of, Weep, No. 4 Bearing Outer.

72-42-20

2A2873-01

Tube Assy of, Weep, No. 4 Bearing Outer.

72-42-33

2A0851

Support Assy, No. 4 Bearing Seal.

72-42-33

2A2833

Support, No. 4 Bearing, Seal Assy.

72-42-33

2A3537

Support, No. 4 Bearing Seal Assy.

72-42-33

2A2834

Seal Assy, No. 4 Bearing, Front.

72-42-33

2A2930

Seal Assy, No. 4 Bearing, Front.

72-42-33

2A3525

Seal Assy, No. 4 Bearing, Front.

72-42-33

2A3538

Seal Assy, No. 4 Bearing, Front.

72-42-35

2A2257-01

Duct Assy, Cooling Air, No. 4 Bearing, Front

72-43-20

2A2056

Seal Assy, No. 4 Bearing, Rear.

72-43-20

2A2931

Seal Assy, No. 4 Bearing, Rear.

72-43-20

2A3526

Seal Assy, No. 4 Bearing, Rear.

72-43-20

2A0847

Seal Ring Holder.

72-43-20

2A1205-01

Duct Assy, Cooling Air, No. 4 Bearing, Rear.

72-43-20

2A3078-01

Duct Assy, Cooling Air, No. 4 Bearing, Rear.

72-45-11

2A3182

Metering Plug, HPT Hub, Stage 1.

72-45-11

2A2354

Metering Plug, HPT Hub, Stage 1.

72-45-13

2A1352

Seal Air, HPT Stage 1.

72-45-13

2A3032

Seal Air, HPT Stage 1.

For V2525-D5 and V2528-D5 engines with HPT stage 1 rotor assembly, P/Ns 2A9521-002 and 2A9621-002, the stage 1 HPT hub metering plug, P/N 2A3182, does not need to be removed.

4. Do not install any part that has a P/N listed in this AD.

Previous Credit

Previous accomplishment of IAE Service Bulletin V2500-ENG-72- 0541, Revision 4, dated March 12, 2008 satisfies the requirements of this AD.

Note 2: FAA AD 2008-14-15 Amdt 39-15610 dated 2 July 2008 refers.

Compliance:

For Requirement 1 - At the next shop visit after the effective date of this AD but not later than 30 November 2008.

For Requirement 2 - At the next shop visit after the effective date of this AD but not later than 30 June 2011.

For Requirement 3 - At the next shop visit after the effective date of this AD but not later than 30 June 2011.

For Requirement 4 - From the effective date of this AD.

This Airworthiness Directive becomes effective on 28 August 2008.

Background:

This AD results from instances of oil loss from the No. 4 bearing compartment. The issuing of this AD is intended to prevent heat damage to high-pressure turbine (HPT) and low-pressure turbine (LPT) critical life limited hardware such as the HPT stage 1-2 airseal. Damage to the HPT stage 1-2 airseal could cause uncontained engine failure and damage to the aeroplane.

\n```\n\n![](image.001.png) \nJames Coyne \nDelegate of the Civil Aviation Safety Authority\n\n18 July 2008","sortOrder":0},{"sectionNumber":"AD/V2500/5","sectionType":"part","heading":"AD/V2500/5","content":"## AD/V2500/5","sortOrder":1},{"sectionNumber":"No. 4 Bearing Oil System Components","sectionType":"part","heading":"No. 4 Bearing Oil System Components","content":"## No. 4 Bearing Oil System Components","sortOrder":2},{"sectionNumber":"9/2008","sectionType":"part","heading":"9/2008","content":"## 9/2008","sortOrder":3}],"analysis":{"flash_summary":{"complexity_score":5,"scope_assessment":{"changed":false,"description":"The instrument prescribes removal of listed No.4 bearing oil‑system parts for specified IAE V2500 models and prohibits their installation from the effective date; it does not state any expansion or reduction of the AD’s original applicability or intent. The AD accepts prior compliance with the identified IAE Service Bulletin as satisfying its requirements ('Previous Credit') and includes specific exceptions for certain HPT rotor assembly P/Ns."},"complexity_factors":["Many specific part numbers listed across three engine‑group tables (V2500‑A1; A5 family; D5 family) — increases inventory and tracking burden.","Different compliance deadlines by engine group (Requirement 1: next shop visit but not later than 30 Nov 2008; Requirements 2 & 3: next shop visit but not later than 30 Jun 2011; Requirement 4: from effective date) — complicates maintenance planning (see 'Compliance').","Absolute prohibition on installing any part with a listed P/N from the AD effective date — creates immediate parts‑control and procurement constraints (see 'Do not install').","Technical removal procedure cross‑references to engine manuals (ATA chapters) — requires authorised MRO capability and may extend shop time.","Conditional carve‑outs: certain HPT stage‑1 rotor assembly P/Ns (2A9521‑002 and 2A9621‑002) exempt one metering plug from removal — adds a parts/P&ID check step.","Previous‑credit clause accepting accomplishment of IAE Service Bulletin Rev 4 — requires record checks to claim credit (see 'Previous Credit').","Safety rationale tied to oil loss and potential HPT/LPT heat damage — enforcement interacts with operational risk management and inspection regimes ('Background').","Cross‑reference to FAA AD and reliance on manufacturer service information increases dependence on external documents for full compliance."],"plain_english_summary":"This Airworthiness Directive requires removal and bans re‑installation of specified No.4 bearing oil‑system parts (listed by part number) from certain IAE V2500 engine variants. Operators, maintenance organisations and parts suppliers must remove the listed components at the next shop visit according to the AD’s deadlines. The Civil Aviation Safety Authority enforces compliance; affected businesses bear labour, scheduling and parts‑tracking costs. The AD accepts prior compliance with IAE Service Bulletin V2500‑ENG‑72‑0541 Revision 4 as meeting its requirements."},"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":{"_metrics":{"completionTokens":618},"content_quality":"ok","complexity_score":6,"scope_assessment":{"changed":false,"description":"This AD maintains its original narrow scope addressing the specific safety issue of No. 4 bearing oil system component failures. The three engine variant sections and detailed part tables represent thorough coverage of the identified defect rather than scope creep."},"complexity_factors":["Three separate requirement sections for different engine sub-models with different compliance deadlines","Extensive tabular data: 35+ specific part numbers across three tables with ATA chapter references","Nested exception for specific HPT rotor assembly part numbers (P/N 2A9521-002 and 2A9621-002) exempting one part from removal","Cross-reference to external technical manuals (E-V2500-1IA, E-V2500-3IA) for removal procedures","Reference to prior service bulletin compliance as alternative satisfaction method","Technical aviation terminology requiring specialised knowledge (ATA chapters, HPT, LPT, airseals, bifurcation panels)","Multiple effective dates and compliance windows creating conditional obligations"],"plain_english_summary":"This CASA Airworthiness Directive mandates removal of specified faulty No.4 bearing oil-system parts from IAE V2500 engines (used on A319/A320/A321 and MD‑90) because oil leaks have caused heat damage that risks HPT airseal failure and possible uncontained engine failure. \n\nIt affects operators and maintenance organisations: listed parts must be removed by variant-specific deadlines, none may be installed after 28 Aug 2008, and compliance with IAE Service Bulletin V2500‑ENG‑72‑0541 Rev 4 satisfies the AD."}},"importantCases":[],"_links":{"self":"/api/acts/ad-v2500-5-no-4-bearing-oil-system-components","history":"/api/acts/ad-v2500-5-no-4-bearing-oil-system-components/history","analysis":"/api/acts/ad-v2500-5-no-4-bearing-oil-system-components/analysis","conflicts":"/api/acts/ad-v2500-5-no-4-bearing-oil-system-components/conflicts","importantCases":"/api/acts/ad-v2500-5-no-4-bearing-oil-system-components/important-cases","documents":"/api/acts/ad-v2500-5-no-4-bearing-oil-system-components/documents"}}