(e)  
Set the arming switch of the ALTERNATE FLAPS to the OFF position.

500 
27-51-73 Page 414  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  May 01/99 

(3)  Do a check of the adjustment of the drivescrew:
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 B hydraulic power (AMM 27-51-0/201).
WARNING:  MAKE SURE THAT PERSONS AND EQUIPMENT ARE CLEAR OF THE LE AND TE FLAPS AND FLAP DRIVE MECHANISMS BEFORE YOU MOVE THE FLAP CONTROL HANDLE. 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.
(b)  
Set the FLAP control lever to the FLAP UP detent to retract the flaps:
1) Make sure that the trailing edge flaps move smoothly.
2) Make sure that the trailing edge flaps retract symmetrically.

(c)  
Remove system B hydraulic power after the flaps are fully retracted
(AMM 27-51-0/201).

(d)  
At the drivescrew that you removed, do a check of the clearance between the ballnut and screw yoke.

(e)  
Make a record of the clearance.

(f)  
Compare the clearance before the removal of the drivescrew with the clearance after the installation of the drivescrew. 1) If the two values for clearance are different, adjust the clearance.

a)  Disconnect the torque tube(s) from the transmission.
NOTE:  For access to the outboard torque tube coupling at the No. 3 and No. 6 transmissions, remove the access panel outboard of the transmission.
b) Turn the input shaft of the transmission in the direction necessary to adjust the clearance to its initial value. c) Align and engage the coupling sleeve with the splined couplings of the
torque tube and the transmission. d) Install the three screws that attach the coupling sleeve to the coupling. e) Install a lockwire to connect the three screws together. f) If it is necessary, install the outboard access panel of the No. 3 and No. 6
transmissions. 2) If the clearance after the installation of the transmission is the same as the clearance before the removal. no adjustment is necessary.
May 01/99 27-51-73 Page 415 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.

I.  Do an Operational Test of the Flaps
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.
(1)  
Supply system B hydraulic power (AMM 27-51-0/201).

WARNING:  MAKE SURE THAT PERSONS AND EQUIPMENT ARE CLEAR OF THE LE AND TE FLAPS AND FLAP DRIVE MECHANISMS BEFORE YOU MOVE THE FLAP CONTROL HANDLE. AN ACCIDENTAL FLAP MOVEMENT CAN CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.

(2)  
Set the FLAP control lever to the 40-unit detent to extend the flaps.

(a)  
Make sure the trailing edge flaps move smoothly.

(b)  
Make sure that the trailing edge flaps extend symmetrically.

(3)  
Set the FLAP control lever to the FLAP UP detent to retract the flaps.

(a)  
Make sure that the movement of the trailing edge flaps is smooth.

(b)  
Make sure that the trailing edge flaps retract symmetrically.

(4)  
Remove system B hydraulic power (AMM 27-51-0/201).

(5)  
Clean the unwanted corrosion preventive compound from the forward and aft ends of the screw.

(6)  
Apply a layer of the lubricating oil to the length of the screw.

J.  Put the Airplane Back to Its Usual Condition
(1)  
Install the applicable access panels as specified below.

(a)  
At the outboard flap transmissions, install the access panel on the lower side of the movable fairing.

(b)  
At the No. 3 transmission, install access panels 5735 and 5736.

(c)  
At the No. 6 transmission, install access panels 5835 and 5836.

(d)  
At the No. 4 and No. 5 transmissions, install the access panel for the transmission on the inboard side.
　
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