Vibration Symptom and Maintenance Action - In-flight Vibration
Figure 201 (Sheet 4)

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H51722
A 737-300/400/500MAINTENANCE MANUAL

Vibration,
no identified
source, location,
or direction.
Flaps Up.
(Cont)

Moderate vertical vibration in aft and forward fuse-lage. Flaps up.
Vibration present (Cont)
10.
Air conditioning pack "off'

11.
 Bleedair valves "off"

12.
 Electrical generators "off"

13.
 If no source has been identified, terminate flight and monitor vibration in revenue service.

Check for free-play in elevator tab (AMM 27-09-91/401, AMM 27-31-31/401, S/B 737-SL-55-9-A, S/B 737-55-1040).

Malfunction assoc-iated with ACS
Malfunction assoc-iated with bleedair
Malfunction assoc-iated with generator(s)
Loose or worn tab
rod ends. Loose,
worn, or missing
rod end bolts,
and/or rod end
locknuts
Loose or worn tab
linkage bearings,
bushings, and/or
bolts.
Loose tab hinge
fitting, tab mast
fitting, due to
loose fasteners
and/or worn holes. Tab mast and hinge fittings are attached directly to the tab and elevator rear spar with screws and nut plates through the spar flanges.
Repair Repair Repair
Contact Boeing Service Engineering for assistance.
Remove panels on lower side of stab-ilizer and inspect for worn or missing parts. Replace worn or missing parts. Replace locknuts and torgue bolts (AMM 27-31-00/ 201 and S/B 737-55-1040).
Replace worn parts. Torque all bolts.
Remove tab and repair.
Vibration Symptom and Maintenance Action - In-flight Vibration
Figure 201 (Sheet 5)

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
H51958
A 737-300/400/500MAINTENANCE MANUAL
3PROBLEM  ISOLATION PROCEDURE  PROBABLE CAUSE  REMEDY 
Moderate vertical  _________________Vibration present 
vibration in aft  (Cont) 
(Cont) lage. Flaps up. and forward fuse- (AMM 27-09-91/401, in elevator tab Check for free-play  on hinge fitting insufficient torque Loose or worn or  fitting bolts. Torque all hinge Replace worn parts. 
AMM 27-31-31/401,  bolts 
S/B 737-55-1040, 
S/B 737-SL-55-9-A. 
1 (Cont) 
Check for free-play 
in elevator 
(AMM 27-09-91/401). 
1 
If only one elevator 
exceeds free-play 
limits, check the 
following on that 
elevator: 
Check hinges by  Worn or defective  Repair or replace 
placing elevator  elevator hinge bear- worn or defective 
in neutral position  ings and/or  bearings and/or 
and apply a "shake"  fittings. Worn or  fittings. Torque 
force at the hinge  loose hinge fitting  all hinge fitting 
positions.  bolts  bolts 
(AMM 27-31-31/401). 
Check elevator hinge  Worn or defective  Replace seals. 
seals.  seals 
Check elevator  Loose or worn  Repair or replace 
balance, panel hinge  elevator balance  worn or loose parts. 
fittings and bolts.  panel hinge fittings  Torque all balance 
and/or hinge bolts  panel hinge bolts 
(AMM 27-31-41/401). 
Check elevator mast  Worn or defective  Repair or replace 
arm bearing.  elevator mast arm  (AMM 27-31-00/401). 
bearing and/or 
fitting 
Check elevator  Worn or defective  Replace worn or 
push-rod bearing  elevator push-rod  defective parts 
and hardware.  bearings, bushings,  (AMM 27-31-00/201). 
bolts, and/or 
locknuts 
　
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