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TASK 77-30-00-810-806
Loss of the N1 Vibration Indication on Engine 2
1. Possible Causes
_______________
- EVMU (2EV)
- wiring from the EVMU (2EV) to the N1 speed sensor (4000EV)
- SENSOR-N1 ROTATIONAL SPD (4000EV)
- harness between the EVMU (2EV) and the N1 speed sensor (4000EV).
2. Job Set-up Information
______________________
A. Referenced Information
-------------------------------------------------------------------------------
REFERENCE DESIGNATION
-------------------------------------------------------------------------------
AMM 71-00-00-710-009 Vibration Check
AMM 77-11-10-000-002 Removal of the N1 Speed Sensor (4000EV)
AMM 77-11-10-400-002 Installation of the N1 Speed Sensor (4000EV)
AMM 77-32-34-000-042 Removal of the Engine Vibration Monitoring Unit
(EVMU) AMM 77-32-34-400-042 Installation of the Engine Vibration Monitoring Unit (EVMU) ASM 77-32/02
3. Fault Confirmation
__________________
A. Test
Not applicable, you cannot confirm this fault on the ground.
4. Fault Isolation
_______________
A. If the Post Flight Report gives the maintenance message ENG2 N1 SPEED
SENSOR:
R - do a check for open or short to ground of the wiring from the EVMU
R (2EV) to the N1 speed sensor (4000EV) pins AB/8B, 7A to pins CC/1, 2
(Ref. ASM 77-32/02).
(1) If the wiring is not correct:
- repair the above wiring.
(2) If the wiring is correct:
- with the cable disconnected from the EVMU, do a resistance check of the EVMU between: pins 8B and 7A (40 to 80 Ohms).
(a) If the resistance values are in the specified limits:
- replace the EVMU (2EV) (Ref. AMM TASK 77-32-34-000-042) and (Ref. AMM TASK 77-32-34-400-042).
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(b) If the resistance values are out of the specified limits: R - with the connector CC disconnected from the N1 speed sensor R (4000EV), do a resistance check of the sensor between:
pins 1 and 2 (40 to 80 Ohms).
1 If the resistance values are out of the specified limits:
_
- replace the SENSOR-N1 ROTATIONAL SPD (4000EV) (Ref. AMM TASK 77-11-10-000-002) and (Ref. AMM TASK 77-11-10-400-002).
2 If the resistance values are in the specified limits:
_
- replace the harness between the EVMU (2EV) and the N1 speed sensor (4000EV). (Ref. ASM 77-32/02).
B. Do the vibration check to get the vibration data (Ref. AMM TASK 71-00-00-710-009).
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TASK 77-30-00-810-807
Loss of the N2 Vibration Indication on Engine 1
1. Possible Causes
_______________
- EVMU (2EV)
- wiring from the EVMU (2EV) to the N2 speed sensor (4001EV)
- SENSOR-N2 ROTATIONAL SPD (4001EV)
- harness between the EVMU and the N2 speed sensor
2. Job Set-up Information
______________________
A. Referenced Information
-------------------------------------------------------------------------------
REFERENCE DESIGNATION
-------------------------------------------------------------------------------
AMM 71-00-00-710-009 Vibration Check
AMM 77-11-20-000-002 Removal of the N2 Speed Sensor (4001EV).
AMM 77-11-20-400-002 Installation of the N2 Speed Sensor (4001EV).
AMM 77-32-34-000-042 Removal of the Engine Vibration Monitoring Unit
(EVMU) AMM 77-32-34-400-042 Installation of the Engine Vibration Monitoring Unit (EVMU) ASM 77-32/02
3. Fault Confirmation
__________________
A. Test
Not applicable, you cannot confirm this fault on the ground.
4. Fault Isolation
_______________
A. If the Post Flight Report gives the maintenance message ENG1 N2 SPEED
SENSOR:
R - do a check for open or short to ground of the wiring from the EVMU
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