737 Operations Manual
Non-Normal Checklists -
Engines, APU
Copyright © The Boeing Company. See title page for details.
D6-27370-400E-TBCE NNC.7.15
HIGH ENGINE VIBRATION
Condition: VIB levels are in excess of 4.0 units accompanied by
airframe vibrations.
If not in icing conditions:
AUTOTHROTTLE (if engaged) . . . . . . . . . . . . .DISENGAGE
[Allows thrust lever to remain where manually positioned.]
THRUST LEVER . . . . . . . . . . . . . . . . . . . . . . . . . . . . RETARD
Retard to maintain VIB below 4 units.
Note: If the VIB indication does not decrease when the
thrust lever is retarded, check other engine
indications. If other engine indications are normal,
no further action is required.
If in icing conditions:
During descent or holding accomplish the following on
one engine at a time at approximately 15 minute
intervals:
ENGINE START SWITCH. . . . . . . . . . . . . . . . . . . . . . . . . FLT
THRUST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ADJUST
Adjust thrust to 45% N1. After approximately five
seconds, advance thrust lever slowly to a minimum of
80% N1.
If vibration does not decrease:
Accomplish the procedure for “If not in icing
conditions.”
June 07, 2002
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