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 05-51-67
 ALL  ú ú 03 Page 201 ú Nov 12/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 (20)
 AMM 27-51-29/401, Inboard Mid Flap Seal Plate

 (21)
 AMM 27-51-34, Outboard Trailing Edge Flaps

 (22)
 AMM 27-51-47, Outboard Foreflap Sequence Carriage

 (23)
 AMM 27-51-52, Outboard Flap Track Fairing

 (24)
 AMM 27-61-11, Flight Spoiler

 (25)
 AMM 27-81-11, Leading Edge Flaps

 (26)
 AMM 32-13-21, Main Landing Gear Wing Door

 (27)
 AMM 32-22-00, Nose Gear Doors

 (28)
 AMM 32-22-11, Nose Gear Wheel Well Doors

 (29)
 AMM 49-00-00, Airborne Auxiliary Power

 (30)
 AMM 49-15-00, APU Air Inlet

 (31)
 AMM 53-31-21, Vortex Generators

 (32)
 AMM 71-00-00, Power Plant

 B.  Procedure
 S 212-014
 (1)  
Horizontal stabilizer and elevator in-flight vibration, see Fig. 201

 S 282-008

 (2)  
If you feel vibration mostly in the forward and aft fuselage, with the trailing edge flaps in the up position, do these steps:

 (a)  Examine the elevator.
 1)  Make sure there is not too much play in these parts for the elevator trim tab (AMM 27-31-00/501): a) the tab pushrod b) the tab lockout mechanism c) the tab hinges.
 2) Make sure the hinge fitting bolts on the elevator are not loose (AMM 27-31-00/501). 3) Do a check for the hinge bolts on the elevator balance panel (AMM 27-31-41).
 4)  Make sure these parts on the elevator output torque tubes are not loose or worn (AMM 27-31-00/501 and 27-31-74/601): a) the bolts that attach the inner or outer torque tubes b) the crank c) the control d) the pushrod e) the elevator mast fitting.
 5)  Make sure the elevator hinge seals and nose seals are installed correctly without damage (AMM 27-31-44/501).
 (b)  
Examine the doors, panels, and fairings.

 1)  Make sure all the doors, panels, and fairings are correctly aligned and attached.

 (c)  
Examine the landing gear doors. 1) Make sure the nose and main gear doors are aligned and all the seals are installed without damage.

 2)  Make sure the nose gear doors are adjusted correctly (AMM 32-22-00).
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 05-51-67
 ALL  ú ú 01 Page 202 ú Nov 12/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 (d)  
Examine the horizontal stabilizer.

 1)  Make sure the hinge bearing for the horizontal stabilizer does not have too much play (AMM 27-41-31/601).

 (e)
Check the elevator control cable tension (AMM 27-09-14/201).

 (f)  
Examine the APU. 1) Make sure there is no indication of a problem with the auxiliary power unit (APU) (AMM 49-00-00/101).

 2)  Make sure the compartments for the APU inlet door are not loose or worn (AMM 49-15-00/501).

 (g)  
Examine the aft vortex generators (not installed on all airplanes). 1) Make sure the vortex generators on the aft body are not

 loose and do not have damage.
 S 282-009
 (3)  If you feel vibration mostly in the wing root area, with the trailing edge flaps in the up position, do these steps:
 (a)  
Examine the trailing edge flaps. 1) Make sure the trailing edge panels on the top of the wings are adjusted correctly (AMM 27-51-34/501). 2) Make sure the flap track fairing on the outboard trailing edge is not loose and does not have damage (AMM 27-51-52).

 3)  Make sure the aft flap on the trailing edge is not delaminated and is in good condition (SRM 51-40-06).

 (b)  
Examine the ram air system. 1) Make sure the louvers for the ram air exhaust are adjusted correctly (AMM 21-52-91). 2) Make sure the seals on the ram air inlet modulation panel are attached (AMM 21-52-41/401).
　
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