SEE B
BALL SCREW
NUT
DIMENSION Y

FWD SEE B
STOP
A B
1.00 INCH (2.54 cm) MINIMUM CLEARANCE WITH THE FLAPS EXTENDED 12 TO 14 INCHES (30 TO 36 cm) FROM THE FULL UP POSITION
SUPPORT
TRACK MIDFLAP
FOREFLAP

SUPPORT TRACK
SHIM
MIDFLAP

MIDFLAP
ROLLER
0.35 INCH (0.89 cm) MAXIMUM 0.35 INCH (0.89 cm) WITH THE FLAPS FULL UP MINIMUM CLEARANCE
(FLAPS IN UP POSITION)
D C
Ballscrew, Flap-To-Flap, and Carriage Adjustment
Figure 501 (Sheet 1)

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A 747-400 MAINTENANCE MANUAL
SPOILER

WING TRAILING EDGE
CONVEX
COMPRESS 10-60%

AFT EDGE OF LEADING EDGE SKIN
OF FIBERGLASS
MIDFLAP COVE PANEL

(FLAPS IN UP POSITION) B-B
____ MEASURE THE CLEARANCE AT THE CLOSEST POINT.
NOTE: THERE IS NO MAXIMUM GAP BECAUSE OTHER PARTS OF THE PANEL CAN HAVE A LARGER CLEARANCE. WITH THE MOVABLE FAIRINGS
INSTALLED AND ADJUSTED. THE MIDFLAP TO SPOILER MINIMUM CLEARANCE THE FLAPS ARE FULLY RETRACTED IS 0.09 |0.07 INCH (0.23 |0.18 cm)

Ballscrew, Flap-To-Flap, and Carriage Adjustment
Figure 501 (Sheet 2)

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747-400
MAINTENANCE MANUAL

BOLT 1 WASHER NUT RETAINER (2 LOCATIONS) BOLT 2
WASHER 3 NUT RETAINER (2 LOCATIONS)SEE F
C
CARRIAGE SUPPORT BEARING
SHIM
MIDFLAP FRAME
C
CARRIAGE MIDFLAP
LINK
SHIM
AFT
E
SHIM 1 THICKNESS
BOLT INCH (mm)
0.000-0.117
BACB30MT6T10 (0.000-2.97)
0.118-0.241
BACB30MT6T12
BUSHING (3.00-6.12)
BUSHING
0.242-0.367
BACB30MT6T14 (6.15-9.32)
WASHER
0.368-0.500
BACB30MT6T16 BOLT
(9.35-12.70)
SHIM  NUT  PIN 
2  THICKNESS  BOLT 
INCH (mm)  SPECIAL 
0.000-0.112  BACB30MT7T17  WASHER  LINK 
(0.000-2.84) 
0.113-0.237  BACB30MT7T19  CARRIAGE 
(2.87-6.02)  SUPPORT BEARING  C-C 
0.238-0.362  BACB30MT7T21 
(6.05-6.65) 
0.363-0.500  BACB30MT7T23 
(6.68-12.70) 

THERE ARE THREE WASHERS NECESSARY FOR THE INBOARD CARRIAGE ASSEMBLY (WBL 584.977)
3
Ball Screw, Flap To Flap, and Carriage Adjustment Figure 501 (Sheet 3)
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MAINTENANCE MANUAL

SEQUENCE 
FOREFLAP  CARRIAGE 
D 
FLAP  D 
TRACK 

CARRIAGE
F
0.80 TO 0.90 INCH
(2.0 TO 2.3 cm)
SEQUENCE
0.10 TO 0.20 INCH
CARRIAGE
(0.25 TO 0.51 cm)
FOREFLAP
SUPPORT
FLAP TRACK

TUBE
HOOK
SHIM
0.125 INCH
(3.18 mm)
D-D MAXIMUM
Ballscrew, Flap-To-Flap, and Carriage Adjustment
Figure 501 (Sheet 4)

G09219
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747-400 MAINTENANCE MANUAL
 H.  Adjust The Sequence Carriage Hook
 S 865-012
 (1)  Supply electrical power (AMM 24-22-00/201).
　
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