737 Flight Crew Operations Manual
7.21
Boeing Proprietary. Copyright © Boeing. May be subject to export restrictions under EAR. See title page for details.
D6-27370-4Q8-SJA
7.21
7 Choose one:
8 Autothrottle (if engaged). . . . . . . . . . .Disengage
9 Thrust lever
(affected engine) . . . . Confirm. . . . . . Retard to
maintain vibration
levels below 4 units or
until the thrust lever is closed
PM398, PM411, PQ976 - PT832
10 Transponder mode selector . . . . . . . . . . . . . . TA
This step prevents climb commands which can
exceed reduced thrust performance capability.
PP518, PP519
11 Transponder mode selector . . . . . . . . . . TA ONLY
This step prevents climb commands which can
exceed reduced thrust performance capability.
■ ■ ■ ■
▼Engine High Vibration continued▼
Vibration level is less than 4 units:
Continue normal operation.
■ ■ ■ ■
Vibration level is 4 units or greater:
►►Go to step 9
Note: If the VIB indication does not decrease when
the thrust lever is retarded, check other
engine indications on the affected engine. If
other engine indications are normal, run the
engine at reduced thrust.
Note: Do not use FMC performance predictions.
June 15, 2020
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