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.
(b)
Set the FLAP control lever to the FLAP UP detent to retract the flaps.
(c)
Make sure that the flaps are fully retracted.
(d)
Remove system B hydraulic power (AMM 27-51-0/201).
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May 01/00 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 27-51-73 Page 401
(2) Remove the applicable access panels as specified below:
(a)
For drivescrews of the outboard flap transmissions, remove the access panel on the lower side of the movable fairing.
(b)
For the drivescrew of the No. 3 transmission, remove access panels 5735 and 5736.
(c)
For the drivescrew of the No. 6 transmission, remove access panels 5835 and 5836.
(d)
Get access to the drivescrews of the No. 4 and No. 5 transmissions.
1) Remove the applicable access panel from the wheel well, to permit access to the drivescrew from the inboard side.
(3) Measure the angular or linear clearance between the ballnut and the screw yoke at the ballscrew to be removed:
(a) Measure the angular clearance between the upstops on the ballnut and the screw yoke: 1) At the drivescrews of the inboard flaps, make sure that the angular clearance is
170 to 190 degrees (approximately 1/2 turn).
2) At the drivescrews of the outboard flaps, make sure that the angular clearance is as shown: a) 170 to 190 degrees (approximately 1/2 turn) for a flap without a torque tube
adjustment to correct lateral trim. b) 90 to 300 degrees (1/4 to 5/6 turn) for a flap with a torque tube adjustment to correct lateral trim. 3) Make a record of the angular clearance dimension.
(b) Measure the linear clearance. 1) Measure the "X" dimension (Fig. 401) at the drivescrew to be removed. 2) Make a record of the "X" dimension.
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.
(4)
Supply system B hydraulic power (AMM 27-51-0/201).
(5)
For the removal of a drivescrew at the outboard flap transmissions, do these steps:
(a)
Move the FLAP control lever on the control stand to the 40-unit detent.
(b)
Install a support to hold the flap when a drivescrew is removed.
(6)
For the removal of a drivescrew at the inboard flap transmissions, move the FLAP control lever to the 1-unit detent.
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500 Transmission Locations and Definition of Dimension X
May 01/99 Figure 401 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 27-51-73 Page 403
(7)
Do this task: "Lock Trailing Edge Flap Bypass Valve" (AMM 27-51-0/201).
(8)
If the drivescrew removal is at the No. 1, No. 2, No. 3, No. 6, No. 7, or No. 8 locations, install spoiler ground locks.
(a)
Supply system A hydraulic power (AMM 27-51-0/201).
(b)
Move the SPEED BRAKE lever on the control stand to the UP detent.
(c)
Remove system A and B hydraulic power after all spoilers are in the extended position (AMM 27-51-0/201).
(d)
Install spoiler ground locks as follows:
DRIVESCREW TO BE REMOVED TOOL NO. SPOILER NO.
1 C27001-( ) 1
2 *[1] F80017-( ) 2 and 3
*[2] C27047-( )
3 *[1] F80017-( ) 3
*[2] C27047-( )
F80040-( ) 4
6 F80040-( ) 5
*[1] F80017-( ) 6
*[2] C27047-( )
7 *[1] F80017-( ) 6 and 7
*[2] C27047-( )
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