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 (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) If the engine has operated in icing condition:
 - Do a visual inspection around the engine to make sure that there are no ice ingestion damages, and especially do a check of the inlet cowl, fan blades, spinner cone, abradable material, OGV, accoustical panels (forward and mid) and splitter fairing.
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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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