AD/V2500/5 No. 4 Bearing Oil System Components (Cth)

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AIRWORTHINESS DIRECTIVE

For the reasons set out in the background section, the CASA delegate whose signature appears below issues the following Airworthiness Directive (AD) under subregulation 39.001(1) of CASR 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.

International Aero Engines AG V2500 series

AD/V2500/5 No. 4 Bearing Oil System Components 9/2008

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.

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.
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.


James Coyne
Delegate of the Civil Aviation Safety Authority

18 July 2008

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