Vibration Symptom and Maintenance Action - In-flight Vibration Figure 201 (Sheet 6)
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05-51-67
ALL ú ú 01 Page 210 ú Nov 12/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
H52008
A 737-300/400/500MAINTENANCE MANUAL
PROBLEM 3 ISOLATION PROCEDURE PROBABLE CAUSE
REMEDY
Moderate vertical Vibration present_________________
vibration in aft (Cont)
and forward fuse-lage. Flaps up. (Cont) rod and bearings. Check elevator PCU bearings elevator PCU rod end Worn or defective Replace bearings.
If both elevators
exceed free-play
limits, check the
following:
Check for worn Worn or defective Replace worn or
bushings at out- bearings and/or defective bearings
board end of torque bushings in output and/or bushings
tube torque tube, (AMM 27-31-74/401).
(IPC 27-30-00-16, centering unit input
Items 225 and 226). rod, neutral shift
linkage, and Mach
trim actuator
Check elevator Loose connections Replace eight bolts
output torque tube in center of output in output torque
bolts. Check for torque tube where tube with oversize
looseness between inner and outer bolts to reduce
output crank and tubes connect clearance in the
outer torque tube. holes
(AMM 27-31-74/401).
Check balance of Repair and/or Remove and
elevator assembly. repaint not properly re-balance elevator
accounted for assembly.
weights. balance, adjust ____NOTE
Elevator must be
within balance
tolerance for
continued safe
operation
(SRM 51-80-04,-05).
Check for free-play Jackscrew worn or Repair or replace.
in stabilizer jack- defective
mechanism. screw and hinge bearings worn or Hinge mechanism or (AMM 27-41-31/401). Repair or replace
defective
Vibration Symptom and Maintenance Action - In-flight Vibration
Figure 201 (Sheet 7)
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05-51-67
ALL ú ú 01 Page 211 ú Nov 12/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
H52357
A 737-300/400/500MAINTENANCE MANUAL
PROBLEM 3 ISOLATION PROCEDURE PROBABLE CAUSE
REMEDY
(Cont) lage. Flaps up. and forward fuse-vibration in aft Moderate vertical worn holes. for loose bolts or section front spar, stabilizer, center to horizontal jackscrew fitting Check attachment of (Cont) _________________Vibration present Worn or loose parts Repair or replace.
Visual inspection parts of airplane for loose or missing Loose or missing vortex generators Procedures Guide, Items 57-30-6). (Dispatch Deviations Repair or replace Section 3,
ated tail cone Damaged or delamin- Repair or replace.
inlet door Loose or worn APU Repair
seals, etc. fairings, doors, Loose or missing Repair or replace.
(Mach > 0.70). airspeed. with decline in ishes or stops Vibration dimin-high airspeed Vibration during fuselage. tailcone and the surface of the between the mating Check for gaps If the tailcone was missing. the sealant may be previously removed, Fillet seal gap (AMM 53-53-0/401). with BMS 5-79
play in the assembly. and jackscrew izer hinge bearing horizontal stabil-Check for excessive ings and/or fittings Loose or worn bear- 1 (AMM 27-41-31/401). loose or worn parts Repair or replace
Procedures Guide, Check aft body vortex generators. Item No. 55-30-1. Section 3, Dispatch Deviations vortex generators Damaged or missing S/B 737-53-1032 and vortex generators damaged or loose 737-55-1005. Repair install as given in If not installed,
(AMM 53-31-21/401).
Vibration Symptom and Maintenance Action - In-flight Vibration
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