No. 4 Bearing Seal Defective or Scavenge Valve Clogged on Engine 2

---

1. Possible Causes
· INDICATOR-POS, NO.4 SCAVENGE VALVE ( 4006EN )
· EIU-2 ( 1KS2 )
· wiring from the EIU 2 (1KS2) to the No. 4 bearing-compartment scavenge-valve (4006EN)
· TRANSDUCER-NO.4 BEARING PRESSURE ( 4005EN )
· ENGINE-2 ( 1000EM2 )
2 Job Set-up Information
A. Referenced Information
REFERENCE DESIGNATION
Ref. AMM 71-00-00-710-013 Test No.11 : High Power Assurance Test
Ref. AMM 71-00-20-000-040 Removal of the Power Plant
Ref. AMM 71-00-20-400-040 Installation of the Power Plant
Ref. AWM 71-51-02
Ref. AMM 73-25-34-000-041 Removal of the Engine Interface Unit (EIU)
Ref. AMM 73-25-34-400-041 Installation of the Engine Interface Unit (EIU)
Ref. AMM 79-23-51-000-010 Removal of the No. 4 Bearing Compartment Scavenge Valve
Ref. AMM 79-23-51-400-010 Installation of the No. 4 Bearing Compartment Scavenge Valve
Ref. AMM 79-33-16-000-010 Removal of the No. 4 Bearing Pressure Transducer
Ref. AMM 79-33-16-400-010 Installation of the No. 4 Bearing Pressure Transducer
Ref. ASM 79-36-01
3. Fault Confirmation
Subtask 79-20-00-710-056-A
A. Do the test No 11: High Power Assurance Test Ref. AMM 71-00-00-710-013 .
4. Fault Isolation
Subtask 79-20-00-810-053-A
A. If the operational test gives the maintenance message CHECK HARNESS OR CHANGE VALVE
4006EN(ENG2):
· replace the INDICATOR-POS, NO.4 SCAVENGE VALVE ( 4006EN ) Ref. AMM 79-23-51-000-010
and Ref. AMM 79-23-51-400-010 .
(1) If the fault continues:
· replace the EIU-2 ( 1KS2 ) Ref. AMM 73-25-34-000-041 and Ref. AMM 73-25-34-400-041 .
(2) If the fault continues:
· do a check and repair the wiring from the EIU 2 (1KS2) to the No. 4 bearing-compartment
scavenge-valve (4006EN) pin AA/7C to pin A/3 Ref. ASM 79-36-01.
(3) If the fault continues:
· replace the TRANSDUCER-NO.4 BEARING PRESSURE ( 4005EN ) Ref.
AMM 79-33-16-000-010 and Ref. AMM 79-33-16-400-010 .
(4) If the fault continues:
· do a check and repair the wiring from the No. 4 bearing-compartment scavenge-valve (4006EN) pin
A/2 to the ground point connection GP4-4 Ref. AWM 71-51-02
(5) Replace the ENGINE-2 ( 1000EM2 ) Ref. AMM 71-00-20-000-040 and Ref.
AMM 71-00-20-400-040 .
Subtask 79-20-00-710-057-A
B. Do the test given in Para. 3. [Rev.6 from Feb 2017] 2026.04.04 04:38:26 UTC