Vibration Symptom and Maintenance Action - In-flight Vibration
Figure 201 (Sheet 19)
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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)
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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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.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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