27-51-73
 ALL  ú ú 02 Page 415 ú Nov 15/97
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
 S 864-068

 (5) Put the upstop on the screw yoke in the same position it was at the
 time of removal.
 NOTE: This is the initial position of the upstop on the screw yoke____
 in relation to the output shaft. Installation of a ballscrew
 with the upstop on the screw yoke in this initial position,
 will help to decrease subsequent adjustment.
 S 424-049
 (6) Assemble the universal joint:
 (a) Assemble and align the transmission output shaft, the screw
 yoke and the trunnion cross.
 (b) Apply a layer of BMS 3-24 grease to the cross pin.
 (c) Put the cross pin through the screw yoke and the trunnion
 cross.
 (d) Apply a layer of the BMS 3-24 grease to the universal joint
 bolt.
 (e) Put the universal joint bolt through the output shaft, the
 trunnion cross, and the cross pin.
 (f) Apply a layer of BMS 3-24 grease to the spacer.
 (g) Put the spacer on the universal joint bolt.
 (h) Clean the threads of the universal joint bolt.
 (i) Apply a layer of BMS 5-95 sealant to the threads of the
 universal joint bolt.
 ú  (j) Install a new self-locking nut on the universal joint bolt.
 ú 
        ú
 NOTE: Make sure that the run on torque of the nut is between____
 ú  34-150 inch-pounds.
 ú
 (k) Tighten the nut to 170-200 pound-inches.
 (l) Make sure that all the chamfer of the bolt shows when the nut
 is fully tightened.
 S 644-072
 (7) Fill the ball nut reservoir (AMM 12-22-51/301)
 H.  Do an initial check of the operation of the trailing edge flaps:
 S 444-052
 (1) Do this task "Trailing Edge Flap System Activation" (AMM
 27-51-00/201).
 S 094-053
 (2) If the ballscrew removal and installation was at the outboard flap
 transmissions, remove the support.

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 27-51-73
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
 S 714-054
 (3)  Do a check of the operation of the trailing edge flaps and the adjustment of the ballscrews:
 NOTE: This initial check of the operation of the trailing edge
____ flaps is completed with the alternate (electric) mode of operation. Operation of the flaps is slower with this mode of operation than with the primary (hydraulic) mode. This can help to prevent damage if there is a problem during the initial operation of the flaps.
 (a)  
Supply electrical power (AMM 24-22-00/201).

 (b)  
Set the arming switch of the ALTERNATE FLAPS to the ARM position.

 WARNING: MAKE SURE THAT PERSONS AND EQUIPMENT ARE CLEAR OF THE LE
_______ AND TE FLAPS AND FLAP DRIVE MECHANISMS BEFORE YOU OPERATE THE TRAILING EDGE FLAPS. AN ACCIDENTAL FLAP MOVEMENT CAN CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
 CAUTION: DURING THE INITIAL OPERATION OF THE TRAILING EDGE FLAPS,
_______ MONITOR THE OPERATION CAREFULLY. STOP THE OPERATION IMMEDIATELY IF THERE IS INDICATION OF A PROBLEM. FIND AND CORRECT THE CAUSE OF THE PROBLEM BEFORE YOU CONTINUE OPERATION OF THE TRAILING EDGE FLAPS. IF YOU DO NOT FOLLOW THESE STEPS, DAMAGE CAN OCCUR.
 (c)  Move the control switch of the ALTERNATE FLAPS to the UP position and hold until the flaps are fully retracted. 1) Make sure that the movement of the trailing edge flaps is
 smooth.
 2)  Make sure that the trailing edge flaps retract symmetrically.
 3)  Make sure that the ballscrew does not touch the adjacent structure.
　
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