Page 33 - Demo

2.10/19
REV 20
A330
CHINA AIRLINES
REV 20
PAGE 19
HIGH ENGINE VIBRATION
The vibration advisory on ECAM is mainly a guideline for the flight crew to monitor engine parameters more closely.
The ECAM vibration advisory alone does not require engine shut down.
Note : 1. High engine vibrations may be accompanied by cockpit and cabin smoke and / or the smells 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.
– ENG PARAMETERS .................................................CHECK
Check engine parameters and especially EGT; crosscheck with other engine. Report in maintenance logbook.
! If icing is suspected :
An increase of N1 vibration in icing conditions with or
without engine anti ice may be due to fan blades and / or spinner icing. Icing may be suspected if N1 vibration occurs without other engine parameters variation.
– A / THR .................................................................... OFF – ENG ANTI ICE ....................................................CHECK
If ENG ANTI ICE is still off, switch it ON at idle fan speed, one engine after the other with approximately 30 s interval.
– THRUST (one engine at a time) .................................................... IDLE THEN INCREASE
Reduce thrust to idle if flight conditions permit.
To shed ice, it may be necessary to perform several thrust variations between idle and a thrust compatible with the flight phase. For efficient ice shedding, thrust should be increased to at least 80 % N1 if flight conditions permit. After each thrust variation, vibrations should decrease, indicating the progress of the ice shedding.
When the ice is shed, vibrations should return to normal and the flight crew can resume normal engine operation.
! If icing is not suspected :
" If above vibration advisory :
– THRUST (affected engine) ............................. REDUCE
If flight conditions permit, reduce thrust to maintain vibration level below the advisory threshold. If the VIB indication does not decrease following thrust reduction, this may indicate other problems on the engine.
Note : If possible, shut down the engine after landing for taxiing, if vibrations above the advisory threshold are, or have been experienced.