737-300 400 500 AMM 飞机维护手册 TIME LIMITS/MAINTENANCE CHE(73)

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hinge fitting bolts  S/B 737-55-1034). 
and bearings 
Loose elevator  Repair or replace 
balance panel hinge  (AMM 27-31-41/401). 
bolts 
Loose or worn eleva- Repair or replace 
tor output torque  (AMM 27-31-00/401, 
tube bolts.  These  AMM 27-31-74/401). 
bolts attach the 
inner and outer 
torque tubes. 
Loose or worn  Repair or replace 
bushings at the  (IPC 27-31-00-16, 
outboard end of  Items 350 and 355). 
torque tube 
Loose or worn out- Repair or replace 
put torque tube  (AMM 27-31-74/401). 
crank control push-
rod or elevator mast 
fitting 

Vibration Symptom and Maintenance Action - In-flight Vibration
Figure 201 (Sheet 19)

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
H52944
A 737-300/400/500MAINTENANCE MANUAL
PROBLEM
3 PROBABLE CAUSE

REMEDYISOLATION PROCEDURE
Vibration felt or Check:
heard in flight 3. Elevator hinge and
Separated or  Repair or replacedeck and empen-nose seals
deteriorated seals  (AMM 27-31-44/401).
nage. Vibration may be constant 4. Elevator control
Incorrect cable  Tension cable
during all phases cable tension
tension  (AMM 27-09-111/
of flight, but 401).
can increase with 5. Weight of elevator
Repair and/or  Remove and weighairspeed.
tab and weight and
repaint not  elevator tab.
(Cont) cg of elevators
properly accounted Remove and and rudder
for with balance  re-balance
adjust weights.  elevators and/or rudder (SRM 51-60-04).
NOTE
Balanced control surfaces must be within balance tolerance for continued safe operation.
High pitched Check the outflow
Diffuser screen S/L 737-SL-21-30 noise audible
valve diffuser
blocked or damaged at the aft two
screen. to three seat rows
Low frequency
Check: vibration felt 1. Engine MCUs.
Right or Left  Test/replace enginein flight deck Slowly retard
Engine fuel control  fuel controland extreme of engine throttle
defective  (AMM 73-20-01/401).
aft pasenger to flight idle,cabin during one at a time toclimb or cruise.
isolate effect toVibration is correct engineusually lateral but may be 2. Engine fan balance
Fan rotor unbalance Lubricate fan and combination of
do the fan rotor lateral and
balance vertical body
(AMM 71-00-00/401). motion.
Vibration Symptom and Maintenance Action - In-flight Vibration
Figure 201 (Sheet 20)

EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 05-51-67
 ALL  ú ú 01 Page 224 ú Nov 12/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
H57505
A 737-300/400/500MAINTENANCE MANUAL
PROBLEM  3  ISOLATION PROCEDURE  PROBABLE CAUSE 
 REMEDY 
Low frequency  Check: 
vibration felt in flight deck  3. Vortex generators  Missing, loose or  Refer to Dispatch 
and extreme of  damaged vortex  Deviations Proce-
aft pasenger  generators  dures Guide, Sec-
cabin during  tion 3, Item No. 
climb or cruise.  55-30-1.  If not 
Vibration is  installed, install 
usually lateral  (S/B 737-51-1015). 
but may be  Repair 
combination of  (AMM 53-31-21/401). 
lateral and  4. Gaps between the  Sealant missing  Fill seal gap with 
vertical body  mating surfaces of  BMS 5-79 sealant 
motion.  the tall cone and  (AMM 53-53-00/201). 
(Cont)  the fuselage 
5. Rudder Free-play  Excessive free-play  Repair or replace 
1  (AMM 27-09-91/401). 
6. Horizontal stabil- Excessive free-play  Repair or replace 
izer hinge bear- (AMM 27-41-31/401). 
ings, jackscrew and 
　
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