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1 If no damage is found:
_ - No maintenance action is required.
2 If damage is found:
_ - Repair or replace as required.
a If during the following flight you record an important
_ decrease of EGT margin:
- Do a borescope inspection of the HPC and do a check of HPC blades for damage (Ref. AMM TASK 72-31-00-290-002).
- Do a borescope inspection of the HPT and do a check of HPT blades for damage (Ref. AMM TASK 72-52-00-290-001).
(b) 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).
(c) 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.
_
(d) Do a check of the Magnetic Chip Detector visual indicator, of the Magnetic Chip Detector (Ref. AMM TASK 79-00-00-281-002) and the Scavenge Screens Plugs (Ref. AMM TASK 79-00-00-281-003).
1 If you find magnetic particles, follow instructions per (Ref.
_ AMM TASK 79-00-00-281-002) and NDT Manual (Section CHIP ANALYSIS).
(e) Do a borescope inspection of booster assembly (Ref. AMM TASK 72-21-00-290-003).
(f) Do a borescope inspection of the Low Pressure Turbine (Ref. AMM TASK 72-54-00-290-005) and (Ref. AMM TASK 72-54-00-290-006).
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(g) If the checks are correct:
- do a relubrication of the fan blades mid-span shrouds and R dovetails (Ref. AMM TASK 72-21-00-210-004),
- do a Cold Trim Balance per specific procedure Fan Trim Balance (Ref. AMM TASK 71-00-00-750-001).
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TASK 77-00-00-810-865
Core Vibrations Higher than or Equal to 4.2 Units (1.68 Ips), and Less than 5.4 Units (2.16 Ips) on Engine 1 or 2
1. Possible Causes
_______________
- wiring, connectors and receptacles
- Engine
- No. 1 bearing vibration sensor (4002EV)
- TRF vibration sensor (4003EV)
- EVMU (2EV)
2. Job Set-up Information
______________________
A. Fixtures, Tools, Test and Support Equipment
-------------------------------------------------------------------------------REFERENCE QTY DESIGNATION -------------------------------------------------------------------------------
No specific bristle brush
No specific megohmeter
No specific soft nose pliers
B. Consumable Materials
-------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
Material No. CP2011 *
stoddard solvent (Ref. 70-30-00)
C. Referenced Information
-------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
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