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increased  swing check (AMM 21-21-12/401, 
airspeed. Can  valve  Item 90). 
be heard over  10. Air distribution  Wear, deterioration  Repair or replace 
the wing or in  duct  or damage. Duct  (AMM 21-21-00/401 
the passenger  leaking or  through 
compartment.  constricted  AMM 21-23-00/401). 
Noise and 
vibration may be  11. Wing leading  Wear, deterioration  Repair or replace 
transmitted to a  edge Krueger  or damage to flap  (AMM 27-81-11 and 
broad area of the  flap  seal door  S/L 737-SL-57-22-A).
airframe.  12. Lower fuselage  Damaged, delamin- Adjust, repair or
(Cont)  doors, access  ated, miss-faired,  replace: 
panels and  missing doors,  . Cargo door 
hatches; includ- panels or associa- (AMM 52-31-0/401) 
ing landing gear  ted seals  . A/C access doors 
and cargo doors,  (AMM 52-48-11/401)
ground service  . APU access door
access panels,  (AMM 52-48-21/401) 
maintenance  . Forward access
compartment  door 
access hatches,  (AMM 52-48-31/401)
panels, and  . E.E. bay access 
components in  door 
and around  (AMM 52-48-41/401)
engines.  . Nose landing gear
 door
 (AMM 32-22-11/401)
. Main landing gear
 door
 (AMM 32-13-11/401)
. Wing doors 
(AMM 32-13-21/401)
. Miscellaneous 
doors 
(AMM 52-49-0/401).

Vibration Symptom and Maintenance Action - In-flight Vibration
Figure 201 (Sheet 15)

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 05-51-67
 ALL  ú ú 01 Page 219 ú Jul 12/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
H57501
A 737-300/400/500MAINTENANCE MANUAL
PROBLEM  3  ISOLATION PROCEDURE  PROBABLE CAUSE 
 REMEDY 
High frequency  Check: 
phases of flight. heard in all up. May not be noise with flaps vibration and  13. 401) (AMM 71-00-00/ balance Engine fan  Engine fan balance out of limits  Balance engine fan (AMM 72-31-00/500). 
May vary with 
increased 
airspeed.  Can 
be heard over 
the wing or in 
the passenger 
compartment. 
Noise and 
vibration may be 
transmitted to a 
broad area of the 
airframe. 
(Cont) 
High frequency  Check: 
up. May not be noise with flaps vibration and  doors 1. Nose landing gear  Seals or rigging  (AMM 32-22-00/401, and/or replace Adjust, repair 
heard in all  AMM 32-22-11/401).
phases of flight. 
Can be heard in  2. Lower fuselage  Seals or rigging  Adjust, repair 
flight deck.  doors, access  and/or replace. 
panels and hatches 
located near 
flight deck. 

Vibration Symptom and Maintenance Action - In-flight Vibration
Figure 201 (Sheet 16)

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 05-51-67
 ALL  ú ú 01 Page 220 ú Nov 12/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
H57503
A 737-300/400/500MAINTENANCE MANUAL
PROBLEM  3  ISOLATION PROCEDURE  PROBABLE CAUSE 
 REMEDY 
High frequency  Check: 
Can be heard over are extended. noise when flaps vibration and the wing.  foreflap flap assembly the trailing edge 1. Vertical play in  bearings sequencing carriage Wear of the foreflap  ing (AMM 27-51-07/ Replace worn bear-600). 
2.  Attachment bolts  Loose bolts  Torque bolts 
on the hinged  (AMM 27-51-47/401). 
flap carriage 
rollers 
3. Play in the  Worn or deteriorated  Replace bearing 
trailing edge  bearing  (IPC 57-51-19-02, 
inboard flap, aft  Item 95). 
　
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