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or direction.  procedures; restore  additional hints 
Flaps Up.  the airplane to normal  and diagnostics. 
(Cont)  flight between each 
step: 
1. Vary speed 
(+30 knots),_ 
altitude 
(+1000 ft), and_ 
angle of attack 
2. Small up-stablizer 
angle and hold;
 then, small 
down-stabilizer
angle and hold 
3. Small right-rudder 
angle and hold, 
then, small 
left-rudder angle
 and hold 
4. If no vibration  After on ground
 found or induced, inspection, contact 
terminate proce- Boeing Service 
dure and monitor  Engineering for 
for vibration  1assistance. 
during service. 
_________________:Vibration present  It is recommended 
Try to isolate fre- that out of 
quency and location.  consideration for 
"Low frequency" can  passenger comfort, 
be felt or seen up to  the following 
about 20 hertz;  flight checks be 
"high frequency" can  conducted during a 
be sensed and usually  non-revenue flight. 
heard above 25 hertz. 
Execute the following 
procedures and 
observe effect on 
vibration. Small 
changes may be mean-
ingful. (Cont) 

Vibration Symptom and Maintenance Action - In-flight Vibration
Figure 201 (Sheet 2)

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
H51709
A 737-300/400/500MAINTENANCE MANUAL

Vibration Symptom and Maintenance Action - In-flight Vibration
Figure 201 (Sheet 3)

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
H51721
A 737-300/400/500MAINTENANCE MANUAL
PROBLEM  ISOLATION PROCEDURE  PROBABLE CAUSE 
 REMEDY 
Vibration,  _________________Vibration present 
no identified  (Cont) 
source, location, or direction. Flaps Up. (Cont)  unchanged. Trade Right engine to flight idle. 4. Left engine slowly 
altitude and 
speed as required 
5. Small right- Rudder free-play  See section on 
rudder angle and 1  moderate lateral 
hold; then, small  vibration in fuse-
left-rudder angle  lage.  Flaps up. 
and hold. 
6. Small up-elevator  Elevator, elevator  See section on 
angle and hold;  tab free-play  1  moderate vertical 
then, use small  vibration in aft 
amount of stabil- and forward fuse-
izer trim to  lage.  Flaps up. 
reduce elevator effect.  Spoiler float.  Re-rig spoiler. 
Jackscrew, star  See section on 
structure, elevator,  moderate vertical 
elevator tab, or  vibration in aft 
elevator torque tube  and forward fuse-
free-play  1  lage.  Flaps up. 
7. Small left- Aileron, aileron See section on 
aileron angle  tab free-play  1  moderate vibration 
and hold; then,  in wing root area. 
small right- Flaps up 
aileron angle  (AMM 27-09-91/401 
and hold.  AMM 27-11-00/401 
AMM 27-11-11/401 
AMM 27-11-31/401 
AMM 27-11-34/401). 
8. Hydraulic  "A" system reservoir  Replace air press-
system "A"  not holding press- ure regulator. 
"off"  ure, or pressure is 
more than 55 psi. 
9. Hydraulic  "B" system reservoir  Replace air press-
system "B"  not holding pressure ure regulator. 
"off"  or pressure is more
than 55 psi 
　
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