S 862-004
(3)
Put the speed brake control lever in the DOWN position.
S 022-006
(4)
Remove the differential mechanism (Fig. 201):
(a)
Disconnect the speed brake pushrod from the differential mechanism: 1) Remove the bolt (4), washer (5) and nut (6).
(b)
Remove the bolt (4), washers (5), and nut (6) to disconnect the link from the central control actuator.
(c)
Remove the bolts (14 and 17), washers (15), and nuts (16) from the coupling on each output shaft.
(d)
Move the couplings on the differential mechanism output shaft.
NOTE: It can be necessary to manually turn the central control
____ actuator link. The couplings can touch the ribs on the mechanism housing.
(e) Remove the four bolts (1), washers (2), and nuts (3) from the differential mechanism.
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A
747-400
MAINTENANCE MANUAL
SEE A 1. BOLT
2. WASHER
3. NUT
(4 LOCATIONS EACH 7. BOLT
MECHANISM) 8. BUSHING
SEE B 9. WASHER
4. BOLT 10. NUT
5. WASHER
6. NUT
SPEED BRAKE
SPOILER OUTPUT PUSHROD GREASE COVER
QUADRANT (EXAMPLE) (2 LOCATIONS)
BOLT4.
WASHER5.
NUT6.
BOLT11.
12. BUSHING
9. WASHER
10. NUT
SEE C
CENTRAL CONTROL ACTUATOR LINK
BOLT14.
15. WASHER
BULKHEAD SPEED BRAKE 16. NUT 13. DIFFERENTIAL
SEQUENCE MECHANISM (4 LOCATIONS)BOLT WASHER 17. 15. MECHANISM (2 LOCATIONS)
A NUT16. (4 LOCATIONS) CENTRAL CONTROL ACTUATOR
Spoiler Differential Mechanism Installation
Figure 201 (Sheet 1)
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A
747-400 MAINTENANCE MANUAL
CENTRAL
CCA INPUT SPOILER OUTPUT
CONTROL SPEED BRAKE
SHAFT QUADRANT
ACTUATOR INPUT CRANK
(2 LOCATIONS)
LEVER ASSEMBLY INPUT ROD
AB
AB
MOUNTING
BOLTS
(5 LOCATIONS) SPEED BRAKE COUPLING SEQUENCE (2 LOCATIONS) SEE D MECHANISM INPUT
SPOILER DIFFERENTIAL RETAINING
MECHANISM BOLT
B
COUPLING
BOLTS
SPOILER DIFFERENTIAL MECHANISM
MOUNTING BOLT SPACER NUT AND WASHER
C
Spoiler Differential Mechanism Installation
Figure 201 (Sheet 2)
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A
747-400
MAINTENANCE MANUAL
A-A B-B
DESIGN LIMITS WEAR LIMITS
PART WORN REPLACE PART WORN REPAIR INSTR REPAIR
X 1
X X 1
X
PERMITTED MAXIMUMDIAMETER
INDEX
WEAR DIAMETER
PART NAME DIM.
NO.
MINIMUM MAXIMUM DIMENSION CLEARANCE INCHES INCHES INCHES INCHES (mm) (mm) (mm) (mm)
1
INPUT LEVER
ID
0.2495
0.2505
0.2535
(6.337)
(6.363)
(6.439)
BOLT
OD
0.2485
0.2495
0.2585
(6.312)
(6.337)
(6.566)
INPUT CRANK
ID
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