27-51-73
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
 B.
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737-300/400/500MAINTENANCE MANUAL
 (2)  
F80040-2, Ground Lock (for spoilers 4 and 5)

 (3)  
F80017-23, Ground Lock (Alternate) (for spoilers 2, 3, 6, and 7) (Use with chanfered flight spoiler clevis)

 (4)  
F80017-33, Ground Lock (Preferred) (for spoilers 2, 3, 6, and 7) (Use with rounded flight spoiler clevis)

 (5)  
C27047-16, Ground Lock (Optional) (for spoilers 2, 3, 6, and 7)

 (Use with rounded flight spoiler clevis)Consumable Materials

 (1)  
A00247 Sealant BMS 5-95

 (2)  
D00633 Grease BMS 3-33 (Recommended)

 (3)  
D00013 Grease MIL-G-23827 (Alternate)

 (4)  
C00308 Corrosion Preventive Compound MIL-C-11796, Class 3

 (5)
D00091 Lubricating Oil, General Purpose Mil-L-7870References

 (1)  
AMM 12-22-51/301, Trailing Edge Flap System Lubrication

 (2)  
AMM 24-22-00/201, Manual Control

 (3)  
AMM 27-51-00/201, Trailing Edge Flap System

 (4)  
AMM 27-51-73/601, Flap Ballscrew

 (5)
AMM 29-15-00/201, Hydraulic Systems A, B, and Standby.Access

 (1)  Location Zones 101, 102 307, 407 309, 409  Control Cabin - Left, RightWing Trailing Edge Outboard Flap and SpoilerWing Trailing Edge Inboard Flap and Spoiler
 (2)  Access Panels 5735, 5835 5736, 5836  Forward Access Panel, Inbd Flap Outbd Track FairingAft Access Panel, Inbd Flap Outbd Track Fairing

Prepare for the Installation of the Ballscrew
 S 224-024
 (1)  
If the bushings used to attach the ball nut are not new, do a check of the worn areas of these bushings (AMM 27-51-73/601).

 S 434-025

 (2)  
Install the end fitting on the end of the ballscrew.

 S 644-026

 (3)  
Apply a layer of BMS 5-95 to the threads of the stud at the end of the ballscrew.

 S 434-027

 (4)  
Install the nut on the stud at the end of the ballscrew.

 S 424-028

 (5)  
Find the correct position of the screw yoke in relation to the screw:

 (a)  
Move the ball nut near the forward end of the screw (the end opposite the end fitting).

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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737-300/400/500MAINTENANCE MANUAL
 (b)  Assemble the screw yoke with the ballscrew.
 NOTE:____ At this time, do not install the fasteners that attach
 the screw to the screw yoke.
 (c)  Move the ball nut to make sure the upstops on the ball nut and
 the screw yoke touch.
 (d)  Turn the ballnut and the screw yoke together until the
 conditions are as follows:
 1)  There is .064 |.035 inch of clearance between the face of
 the screw yoke and the upstop on the ball nut (Fig. 401),
 and
 2)  The fastener holes in the screw yoke and the screw align.
 (e)  On the forward end of the screw, make a mark of the position of
 the upstop on the screw yoke.

 S 024-029
 (6)  
Remove the screw yoke from the screw.

 S 024-030

 (7)  
Move the ball nut away from the forward end of the screw.

 S 164-031

 (8)  
Clean the screw yoke to prepare it for the sealant and the assembly with the screw.

 S 644-032

 (9)  
Apply BMS 5-95 sealant to the mating surfaces of the screw yoke and the screw.

 S 424-033

 (10)
 Do these steps to complete the assembly of the screw with the screw yoke:

 CAUTION: MAKE SURE THAT THE SCREW YOKE IS CORRECTLY INSTALLED ON
_______ THE BALLSCREW. IF THE SCREW YOKE IS NOT CORRECTLY INSTALLED, THE MECHANICAL STOPS ON THE BALL NUT AND SCREW YOKE WILL NOT OPERATE CORRECTLY.
 (a)  
Turn the screw yoke to align the upstop on the screw yoke with the mark on the screw end.

 (b)  
Align the fastener holes in the screw yoke and the screw.
　
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