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N2 vibrations can occur without perceivable airframe vibrations.
�� If no icing conditions:
ENG PARAMETERS ........................................................................................................CHECK
Check engine parameters and especially EGT; crosscheck with other engine. Report in
maintenance log.
�� If rapid increase above the advisor:
THRUST LEVER (affected engine).......................................................................... RETARD
Flight conditions permitting reduce N1 to maintain vibration level below advisory threshold.
Note: If the VIB indication does not decrease following thrust reduction, this may
indicate other problems on the engine. Apply adequate procedure.
�� If icing conditions:
An increase of engine vibration in icing conditions with or without engine anti-ice may be due to
fan blades and/or spinner icing.
ATHR ...............................................................................................................................CHECK
ENGINE ANTI ICE..................................................................................................................OFF
If ENG ANTI ICE pb-sw is off, switch it ON at idle fan speed, one engine after the other with
approximately 30 s interval.
THRUST LEVER (one engine at a time).....................................................INCREASE THRUST
Increase thrust to a setting compatible with the flight phase. VIB level will come back to normal
after ice shed despite a slight increase during acceleration.
Resume normal operation.
To be continued on next page
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
PROCEDURES
ABNORMAL AND EMERGENCY PROCEDURES
POWER PLANT
A318/A319/A320/A321 FLEET PRO-ABN-70 P 177/194
FCOM 19 AUG 10
HIGH ENGINE VIBRATION (Cont'd)
Note: If possible, shut the engine down after landing for taxiing, when vibrations above the
advisory level have been experienced during the flight.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
PROCEDURES
ABNORMAL AND EMERGENCY PROCEDURES
POWER PLANT
A318/A319/A320/A321 FLEET PRO-ABN-70 P 178/194
FCOM 19 AUG 10
HIGH ENGINE VIBRATION
Applicable to: MSN
4566,,,
�� High N2 vibrations during engine start on ground:
Engine start should be aborted (if vibration indication are available) when N2 vibration level
exceeds the 6.5 units advisory threshold. The subsequent start is to be initiated after the engine
has completely spooled down. This procedure may be repeated a maximum of three times.
Report in log book any N2 vibration advisory condition.
�� High N1 or N2 vibrations in operation:
The VIB advisory on ECAM (N1 ≥ 5 units, N2 ≥ 5 units) is mainly a guideline to induce the crew
to monitor engine parameters more closely.
VIB detection alone does not require engine shut down.
Note: 1. High engine vibrations may be accompanied by cockpit and cabin smoke and/or
the smell of burning. This may be due only to compressor blade tip contact with
associated abradable seals.
2. High N1 vibrations are generally accompanied by perceivable airframe vibrations.
High N2 vibrations can occur without perceivable airframe vibrations.
�� If no icing conditions:
ENG PARAMETERS ........................................................................................................CHECK
Check engine parameters and especially EGT; crosscheck with other engine. Report in
maintenance log.
�� If rapid increase above the advisor:
THRUST LEVER (affected engine).......................................................................... RETARD
Flight conditions permitting reduce N1 to maintain vibration level below advisory threshold.
Note: If the VIB indication does not decrease following thrust reduction, this may
indicate other problems on the engine. Apply adequate procedure.
�� If icing conditions:
An increase of engine vibration in icing conditions with or without engine anti-ice may be due to
fan blades and/or spinner icing.
ATHR ...............................................................................................................................CHECK
ENGINE ANTI ICE..................................................................................................................OFF
If ENG ANTI ICE pb-sw is off, switch it ON at idle fan speed, one engine after the other with
approximately 30 s interval.
To be continued on next page
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
PROCEDURES
ABNORMAL AND EMERGENCY PROCEDURES
POWER PLANT
A318/A319/A320/A321 FLEET PRO-ABN-70 P 179/194
FCOM 19 AUG 10
HIGH ENGINE VIBRATION (Cont'd)
THRUST LEVER (one engine at a time).....................................................INCREASE THRUST
　
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