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3 The insulation resistance is expected to be greater than 20
_ Megohms. If anyone of these measurement is less than 20 Megohms, the sensor is not serviceable.
a If one of the two vibration sensors is found not
_
serviceable:
- configure the MCDU to read the other vibration sensor output (Ref. AMM TASK 77-32-34-860-041)
- if the TRF vibration sensor is not serviceable, it should be replaced (Ref. AMM TASK 77-31-30-000-002).
NOTE : The No. 1 bearing vibration sensor cannot be
____ replaced on-wing.
(d) If the check (a), (b) and (c) are correct:
- do the operational test of the Engine Vibration Monitoring Unit EVMU throught the Centralized Fault Display System (CFDS) (Ref. AMM TASK 77-32-34-710-040)>.
(e) If the check (a), (b), (c) and (d) are correct:
- configure the MCDU to read the other vibration sensor output (Ref. AMM TASK 77-32-34-860-041)
(2) Do the following checks if aircraft structure vibration/rumble was also reported by the crew.
NOTE : During descent or approach in icing conditions, ice may build
____ up on the fan blade and spinner cone and consequently lead to increase the fan vibration level on the engine(s). In this case, no maintenance action is required.
(a) Do a check of the fan blades (Ref. AMM TASK 72-21-00-210-009) and LPT Stage 4 blades for shingling or damage.
1 If the check is not correct:
_
a If fan blade damage or mid-span shroud shingling, repair as
_
necessary.
b If LPT Stage 4 blades shingling, use procedure (Ref. AMM
_ TASK 72-54-00-290-006).
(b) Do a check and an inspection of the accessories and QEC components. This includes the check and inspection of:
- the accessory gearbox mounts
- the links and brackets of the accessories to make sure they are not loose or broken
- the cowling brackets, hinges and rigging
- the pneumatic system for correct condition and rigging.
1 If the check is not correct, repair or replace as necessary.
_
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(c) If the checks (a) and (b) are correct:
- do a Cold Trim Balance per specific procedure Fan Trim Balance (Ref. AMM TASK 71-00-00-750-001).
(d) If same crew observation is still reported during following flight(s):
- do a relubrication of the fan blades mid-span shrouds and R dovetails (Ref. AMM TASK 72-21-00-210-004).
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TASK 77-00-00-810-864
Fan Vibrations Higher than or Equal to 6 Units on Engine 1 or 2
1. Possible Causes
_______________
- wiring, connectors and receptacles
- No. 1 bearing vibration sensor
- TRF vibration sensor
- EVMU
- fan blades
- LPT Stage 4 blades
- fan blades mid-span shrouds
2. Job Set-up Information
______________________
A. Fixtures, Tools, Test and Support Equipment
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REFERENCE QTY DESIGNATION
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No specific bristle brush
B. Consumable Materials
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REFERENCE DESIGNATION
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Material No. CP2011 *
Stoddard solvent (Ref. 70-30-00)
C. Referenced Information
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REFERENCE DESIGNATION
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