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segment actuation 
mechanism cam 
roller bearing. 
The bearing is 
located on the 
inboard end of 
the midflap 
segment. 
4. Upper wing trail- Panels out of  Adjust panels 
ing edge panels  adjustment  (IPC 57-30-00-15A 
and AMM 27-51-34/ 
500). 
5. Foreflap/spoiler  Separation or  Repair or replace 
interface blade  deterioration of the  (AMM 27-61-11/401). 
seal  blade seal 
6. Leading edge slat  Loose panel  Repair or replace 
actuator access  (IPC 57-30-0-65 
panel  through -65D). 
7. Trailing edge aft  Delamination  Repair or replace 
flap  (SRM 57-53-02/401). 
8.  Inboard aft flap  Worn or deteriorated  Repair or replace 
drive mechanism  drive  (IPC 57-51-19-02, 
Items 95,100,220 
and 220J). 
9. Left and right  Defective turbofan  Repair or replace 
pack turbofan  (IPC 21-52-52-01, 
Item 505). 

Vibration Symptom and Maintenance Action - In-flight Vibration
Figure 201 (Sheet 17)

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H52932
A 737-300/400/500MAINTENANCE MANUAL

Humming noise just aft of the wing
Vibration reported, related to hydraulics. One beat per second knocking sound during climb.
Vibration reported, related to engine Inboard midflap seal plate (elephant ear)
Check:
1.
With airplane on jack stands, check if hydraulic Power Transfer Unit (PTU) runs when flaps are moved from flaps 2 to flaps 15.

2.
If the PTU is running, check autoslat PTU pressure switch.

Check:
1.
Engine fan rotor balance

2.
Aft engine mounts

3.
Forward engine mounts

4.
Engine

5.
Check fuel control

Mis-adjusted seal plate
System "B" hydraulic pressure should be higher than 2350 psi
Faulty autoslat PTU pressure switch
Fan rotor unbalance
Wear and deterior-ation of aft engine mounts
Wear and deterior-ation of forward engine mounts
Associated with Engine
Fuel control oscillation results in thrust vibration
Repair or replace
(AMM 27-51-29/401).

Replace PTU.

Replace
(IPC 29-22-41-1,
Item 70J).

Balance fan rotor
(AMM 71-00-00/401,
test 7 and
AMM 72-31-00/401).

Repair or replace
(SB 737-71-1170).

Repair or replace
(S/B 737-71-1149).

Reference CFM
International
Commercial Engine
Service
Memorandum
CESM No. 020 for
CFM56-3/-3B/-3C
Engines.

Remove and replace
MEC
(AMM 73-21-01/401).

Vibration Symptom and Maintenance Action - In-flight Vibration
Figure 201 (Sheet 18)

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A 737-300/400/500MAINTENANCE MANUAL
PROBLEM  3  ISOLATION PROCEDURE  PROBABLE CAUSE 
 REMEDY 
Vibration felt or Check: 
may be constant nage. Vibration deck and empen-heard in flight  1 1. Rudder free-play 401) (AMM 27-09-91/  components. Loose or worn  AMM 27-21-11/401). (AMM 27-21-00/401 Repair or replace 
during all phases 
of flight, but 
can increase with 
airspeed. 
2. Elevator free- Loose or worn eleva- Repair or replace 
play  tor tab pushrods,  (AMM 27-31-00/201, 
(AMM 27-09-91/ tab lockout  S/L 737-55-9-A, 
401)  1  mechanism or tab  S/B 737-55-1040). 
hinges.  Missing 
tab lock linkage 
bolts 
Loose, missing, or  Repair or replace 
worn elevator tab  (AMM 27-31-31/401, 
　
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