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

(4)  
D00091 Lubricating Oil, General Purpose MIL-L-7870

C.  References
(1)  
AMM 12-22-51/201, Trailing Edge Flap System Lubrication

(2)  
AMM 24-22-0/201, Manual Control

(3)  
AMM 27-51-0/201, Trailing Edge Flap System

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

500 
May 01/00  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  27-51-73 Page 407 

H97003
Drivescrews of the Inboard Flap Transmissions  500 
27-51-73  Figure 403  May 01/99 
Page 408 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

D.  Access
(1) 
 Location Zones
101, 102 Control Cabin - Left, Right
307, 407 Wing Trailing Edge Outboard Flap and Spoiler
309, 409 Wing Trailing Edge Inboard Flap and Spoiler

(2) 
 Access Panels
5735, 5835 Forward Access Panel, Inbd Flap Outbd Track Fairing
5736, 5836 Aft Access Panel, Inbd Flap Outbd Track Fairing

E.  Prepare for the Installation of the Drivescrew
(1)  
If the bushings used to attach the ballnut are not new, do a check of the worn areas of these bushings (AMM 27-51-73/601).

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

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

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

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

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

(b)  
Assemble the screw yoke with the drivescrew.

NOTE:  At this time, do not install the fasteners that attach the screw to the screw yoke.

(c)  
Move the ballnut to make sure the upstops on the ballnut 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 ballnut (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.

(6)  
Remove the screw yoke from the screw.

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

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

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

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

500 
May 01/99  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  27-51-73 Page 409 

CAUTION:  MAKE SURE THAT THE SCREW YOKE IS CORRECTLY INSTALLED ON THE DRIVESCREW. IF THE SCREW YOKE IS NOT CORRECTLY INSTALLED, THE MECHANICAL STOPS ON THE BALLNUT 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.

(c)  
Install the two sets of fasteners that attach the drivescrew to the screw yoke. 1) Apply a layer of BMS 5-95 sealant to the threads and shanks of the two bolts. 2) Install the bolts in the holes. 3) Install a washer and nut on each bolt. 4) Tighten the nut on each bolt to 60-85 pound-inches.

F.  Install the Drivescrew of an Outboard Flap Transmission (Fig. 402)
(1)  
Turn the ballnut until the "X" dimension of the drivescrew is the same as at the time of removal.

(2)  
With the tangs on the gimbal in the direction of the screw yoke, put the aft end of the drivescrew through the gimbal.

(3)  
Turn the ballnut until the oil reservoir is in the same position it was before the drivescrew removal (the initial position in relation to inboard or outboard).

(4)  
Move the drivescrew back through the gimbal until the ballnut is in the gimbal.

(5)  
Attach the gimbal to the ballnut:

(a)  On the top side of the gimbal, attach the top flanged bushing: 1) Apply a layer of MIL-C-11796, Class 3, corrosion preventive compound to the outer surface of the flanged bushing. 2) If shims were installed with the flanged bushing when you removed it, install the same thickness of shims on the bushing. 3) Apply a thin layer of the BMS 5-95 sealant around the edge of the cover that is
　
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