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R TASK 75-30-00-810-841
R Bleed Bias System on Engine 1
R 1. Possible Causes
_______________
R - Ignore the VTURI, BLD SNSR, ECU message. No maintenance action is required R - Ignore the VTURI, BLD SNSR, ECU* message. No maintenance action is R required
R 2. Job Set-up Information
______________________
R Not Applicable
R 3. Fault Confirmation
__________________
R A. Not applicable, the Bleed Bias System is not installed.
R 4. Fault Isolation
_______________
R A. On Channel 1B:
R Ignore the VTURI, BLD SNSR, ECU message. No maintenance action is
R required Ignore the VTURI, BLD SNSR, ECU* message. No maintenance action
R is required.
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R TASK 75-30-00-810-842
R Bleed Bias System on Engine 2
R 1. Possible Causes
_______________
R - Ignore the VTURI, BLD SNSR, ECU message. No maintenance action is required R - Ignore the VTURI, BLD SNSR, ECU* message. No maintenance action is R required
R 2. Job Set-up Information
______________________
R Not Applicable
R 3. Fault Confirmation
__________________
R A. Not applicable, the Bleed Bias System is not installed.
R 4. Fault Isolation
_______________
R A. On Channel 2B:
R Ignore the VTURI, BLD SNSR, ECU message. No maintenance action is
R required Ignore the VTURI, BLD SNSR, ECU* message. No maintenance action
R is required.
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VARIABLE STATOR VANE SYSTEM (VSV) - FAULT ISOLATION PROCEDURES
______________________________________________________________
TASK 75-32-00-810-801
Failure of the VSV System on Engine 1
1. Possible Causes
_______________
- harness J7
- Hydromechanical Unit (HMU)
- ECU (4000KS)
2. Job Set-up Information
______________________
A. Referenced Information
-------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
AMM 73-21-10-000-002 Removal of the Hydromechanical Unit (HMU)
AMM 73-21-10-400-002 Installation of the Hydromechanical Unit (HMU)
AMM 73-21-50-000-040 Removal of the HJ7 Harness
AMM 73-21-50-400-040 Installation of the HJ7 Harness
R AMM 73-21-60-000-001 Removal of the Electronic Control Unit (ECU)(4000KS) AMM 73-21-60-400-001 Installation of the Electronic Control Unit R (ECU)(4000KS) AMM 73-29-00-710-040 Operational Test of the FADEC on the ground (with Engine Motoring) ASM 73-25/18
3. Fault Confirmation
__________________
A. Test
(1) Do the operational test of the FADEC 1A on the ground (with engine motoring) (Ref. AMM TASK 73-29-00-710-040).
4. Fault Isolation
_______________
A. If the test gives the maintenance message VSV ACT, HMU:
- manually operate the VSV system and make sure that the system moves smoothly and freely.
(1) If the fault continues:
- do a check for line to line short circuit of the harness J7 between the ECU (4000KS) and the VSV torque-motor (Ref. ASM 73-25/18).
(2) If the fault continues:
- disconnect the cable J7 from the ECU and do a check of the ECU resistance between: . pins 25 and 26 (17 to 23 Ohms).
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