(2)  
Remove the spoiler locks you installed for the removal and installation of the drivescrew.

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WARNING:  MAKE SURE THAT PERSONS AND EQUIPMENT ARE CLEAR OF ALL CONTROL SURFACES BEFORE YOU SUPPLY HYDRAULIC POWER. AILERONS, RUDDERS, ELEVATORS, FLAPS, SPOILERS, LANDING GEAR, AND THRUST REVERSERS CAN MOVE QUICKLY WHEN YOU SUPPLY HYDRAULIC POWER. THIS CAN CAUSE INJURY TO PERSONS AND DAMAGE TO EQUIPMENT.
(a)  
Supply system A and B hydraulic power (AMM 27-51-0/201).

(b)  
Move the SPEED BRAKE lever on the control stand to the DOWN detent.

(c)  
Remove system A and B hydraulic power after all spoilers are retracted 
(AMM 27-51-0/201).

(3)  Remove electrical power if it is not necessary (Ref 24-22-0/201).
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FLAP DRIVESCREW - INSPECTION/CHECK
1.  General
A.  This procedure gives instructions for a check of these items at all transmissions:
(1)  
The wear on the journals of the ballnut of a drivescrew.

(2)  
The wear on the flanged bushings that attach a ballnut to a gimbal.

B.  This procedure gives instructions for the check of these items at the transmissions of the outboard trailing edge flaps:
(1)  
The wear on the journals of the gimbals.

(2)  
The wear on the flanged bushings that attach a gimbal to the fitting on the midflap.

C.  This procedure gives the instructions to do a check of the Flap Drivescrew Backlash.
2.  Flap Drivescrew Inspection
A.  Standard Tools and Equipment
(1)  
Micrometer - 0 to 1 inch

(2)  
Vernier Caliper

(3)  
C27030-33 - Flap Screw Backlash Tool

B.  References
(1)  AMM 27-51-73/401, Flap Drivescrew
C.  Access
(1)  Location Zone
307, 407 Wing Trailing Edge Outboard Flap and Spoiler
309, 409 Wing Trailing Edge Inboard Flap and Spoiler

D.  Procedure
(1)  Remove the parts at each transmission of the outboard trailing edge flaps (AMM 27-51-73/401).
(a)  
Put the flap control lever at the 25 unit position (there will be tension at the drivescrew).

(b)  
Install the backlash test tool, C27030-33.
1) Install the clamp on the shaft of the drivescrew.

NOTE:  Use the lever tool to put the clamp in position on the shaft.
2)  To keep the clamp in position, apply a maximum of 100 inch-pounds of torque to
the locking bolt. 3) Install the magnetic dial indicator. 4) Make sure the dial indicator is at 0. 5) Install the lever tool. 6) Apply 40-80 pounds to the handle of the lever tool.
NOTE:  When you apply the load to the handle of the lever tool, it causes an 800-pound axial load at the ballnut.
7)  Make sure there is less than 0.0095 inch of axial backlash between the ballnut and the screw. a) If there is more than 0.0095 inch of axial backlash, remove and replace the
units that are not in tolerance.
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(c)  
Disconnect the gimbal from the fitting on the midflap.

(d)  
Disconnect the ballnut from the gimbal.

(e)  
Do a check of the wear surfaces of the parts with a micrometer or vernier caliper as applicable (Fig. 601).

(f)  
Compare the dimensions measured with the permitted dimensions shown in Fig. 601.

(g)  
Repair or replace the parts that are not in the tolerance specified in Fig. 601.

(h)  
Connect the ballnut to the gimbal.

(i)  
Connect the gimbal to the fitting on the midflap.

(2)  Remove the parts at each transmission of the inboard trailing edge flaps (AMM 27-51-73/401).
(a)  
Put the flap control lever at the 25 unit position (there will be tension at the drivescrew).

(b)  
Install the backlash test tool, C27030.
1) Install the clamp on the shaft of the drivescrew.

NOTE:  Use the lever tool to put the clamp in position on the shaft.
2)  To keep the clamp in position, apply a maximum of 100 inch-pounds of torque to
the locking bolt. 3) Install the magnetic dial indicator. 4) Make sure the dial indicator is at 0. 5) Install the lever tool. 6) Apply 40-80 pounds to the handle of the lever tool.
　
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