S 224-054
(2)
Examine the adjustment of the aftflap drive mechanism:
(a)
Push the ALTN FLAPS ARM switch to put the flaps in alternate control.
(b)
Make sure that the hooks on the geneva cams are in the released position (Detail D).
CAUTION:_______MONITOR THE FLAP MOVEMENT CAREFULLY. THE FLAPS CAN BE DAMAGED BY INCORRECTLY ADJUSTED COMPONENTS.
(c)
Use the ALTN FLAPS ARM switch to move the ball screw nut electrically to the position shown in Fig. 402.
(d)
Open these circuit breakers and attach DO-NOT-CLOSE tags:
1) P415 Power Distribution Center - Right a) 415A18 ALT INBD TE FLAPS
(e)
Make sure the aftflap is in the position shown in Section B-B, Fig. 401.
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27-51-39
ALL ú ú 01 Page 422 ú Oct 18/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL
SEE A BALLSCREW NUT
TRANSMISSION SEE B
UPSTOP A
JOINT UNIVERSAL
SEE C DOWNSTOP
BALLSCREW NUT
B BALLSCREW DIMENSION X (1.651 |0.006 METERS) 65.00 |0.25 INCH
UNIVERSAL JOINT
C STOP BALLSCREW NUT
Figure 402 Aftflap Drive Adjustment Position
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27-51-39
ALL ú ú 01 Page 423 ú Oct 18/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
(f)
If the dimension is not in the tolerance, do this task: "Aftflap Drive Mechanism Adjustment" (Ref Paragraph 18).
(g)
If the dimension is in the tolerance, move the flap control lever to agree with the position of the flaps.
S 864-127
(3)
Remove the DO-NOT-CLOSE tags and close these circuit breakers:
(a)
P415 Power Distribution Center - Right
1) 415A18 ALT INBD TE FLAPS
S 864-057
WARNING: MAKE SURE THAT PERSONS AND EQUIPMENT ARE CLEAR OF THE LE AND TE
_______ FLAPS AND FLAP DRIVE MECHANISMS BEFORE YOU DISARM ALTERNATE CONTROL. THE FLAPS WILL MOVE AUTOMATICALLY TO THE POSITION OF THE FLAP CONTROL LEVER.
(4)
Push the ALTN FLAPS ARM switch to disarm the alternate flap control.
S 864-058
(5)
Do this task to pressurize hydraulic system No. 1: "Hydraulic System Pressurization" (AMM 29-11-00/201).
S 864-129
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 LEVER. WITH HYDRAULIC POWER REMOVED, THE FLAPS WILL MOVE AUTOMATICALLY BY ELECTRICAL POWER WHEN YOU MOVE THE FLAP CONTROL LEVER.
(6)
Extend and retract the flaps slowly.
(a)
Make sure the flaps move smoothly.
F.
Put the Airplane Back to Its Usual Condition
S 864-060
(1)
Do this task to depressurize hydraulic system No. 1: "Hydraulic System Depressurization" (AMM 29-11-00/201).
S 864-061
(2)
Do this task: "Remove Electrical Power" (AMM 24-22-00/201).
TASK 27-51-39-404-062
12. Upstop Fitting Installation
___________________________
A. Consumable Materials
(1)
D00633 Grease - BMS 3-33 (recommended)
(2)
D00013 Grease - MIL-G-23827 (alternative)
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