Boeing 737 - Engine High Vibration

737 Flight Crew Operations Manual
7.20
Boeing Proprietary. Copyright © Boeing. May be subject to export restrictions under EAR. See title page for details.
D6-27370-4Q8-SJA
7.20
1 Choose one:
2 ENGINE START switches (both) . . . . . . . . . . FLT
3 Autothrottle (if engaged) . . . . . . . . . . .Disengage
5 Thrust lever
(selected engine) . . . . . . . . . . Reduce as needed
for flight conditions
6 Wait 15 seconds. This allows the engine vibration
level to stabilize.
▼ Continued on next page ▼
Engine High Vibration
Condition:
The vibration level is 4.0 units or greater.
Airframe vibration may or may not be felt.
In icing conditions:
►►Go to step 2
Not in icing conditions:
►►Go to step 8
Do the next two steps on one engine at a time.
4
Thrust lever
(selected engine) . . . . . . . . . Retard to 45% N1
for five seconds,
then slowly advance
to a minimum of 80% N1
for approximately 1 second.
December 20, 2018