Failure of the Signal of the No. 4 Bearing Pressure Transducer on Engine 2

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1. Possible Causes
· wiring from the pins AA/7J, 8K of the EIU 2 (1KS2) to the pins A/D,E of the No. 4 bearing pressure
transducer (4005EN)
· wiring from the No. 4 bearing pressure transducer (4005EN) pin A/A to the C/B (1EN2) pin 2
· TRANSDUCER-NO.4 BEARING PRESSURE ( 4005EN )
· EIU-2 ( 1KS2 )
2 Job Set-up Information
A. Referenced Information
REFERENCE DESIGNATION
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 73-25-34-710-042 Operational Test of the EIU with the CFDS
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 79-33-00-710-056-A
A. Test
(1) Do the operational test of the EIU 2 with the CFDS Ref. AMM 73-25-34-710-042 .
4. Fault Isolation
Subtask 79-33-00-810-053-A
A. If the operational test gives the maintenance message CHECK N4 BRG SCAV PRESS XMTR2 CIRCUIT
4005EN:
· Do a check and repair the wiring from the pins AA/7J, 8K of the EIU 2 (1KS2) to the pins A/D,E of the
No. 4 bearing pressure transducer (4005EN) , Ref. ASM 79-36-01.
(1) If the fault continues:
· Do a check and repair the wiring from the No. 4 bearing pressure transducer (4005EN) pin A/B to
the ground point connection GP4-5 Ref. AWM 71-51-02.
(2) If the fault continues:
· Do a check and repair the wiring from the No. 4 bearing pressure transducer (4005EN) pin A/A to
the C/B (1EN2) pin 2 , 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:
· Replace the EIU-2 ( 1KS2 ) , Ref. AMM 73-25-34-000-041 and Ref. AMM 73-25-34-400-041 .
Subtask 79-33-00-710-057-A
B. Do the test given in Para. 3. [Rev.6 from Feb 2017] 2026.04.04 04:38:29 UTC