until there is no continuity between pins 3 and 4. 2) Slowly adjust the arm switch aft (away from the striker plate) until there is continuity between pins 3 and 4. 3) Move the switch 0.07 to 0.09 inch (1.78-2.29mm) closer to the striker plate.

 (i)  
Tighten the mounting nuts on the switch and install lockwire.

 S 425-180
 (14)
 Connect the automatic speed brake actuator to the idler crank with the bolt, washer and nut.

 (a)  
Remove the DO-NOT-CLOSE tag and close the following circuit breaker: 1) P7, Overhead Circuit Breaker Panel

 a) 7G6, SPEED BRAKE AUTO CONT
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A
747-400
MAINTENANCE MANUAL

 S 865-196
 (15)
 Do this task: "Supply Hydraulic Pressure" (AMM 29-11-00/201).

 S 715-181

 (16)
 Make sure the switch operates correctly.

 (a)  
Make sure the No. 1 and 3 thrust levers are in the idle position.

 (b)  
Make sure the No. 2 and 4 reverse thrust levers are in the idle position.

 (c)  
Move the speed brake lever to the ARM position.

 (d)  
Make sure the speed brake lever automatically moves to the UP position.

 S 865-197
 (17)
 Do this task: "Remove Hydraulic Pressure" (AMM 29-11-00/201).

 S 865-129

 (18)
 Deactivate the automatic speed brake actuator (Fig. 503):

 (a)  
Make sure the speed brake actuator is fully extended.

 (b)  
Open the following circuit breaker and attach a DO-NOT-CLOSE tag: 1) P7, Overhead Circuit Breaker Panel

 a) 7G6, SPEED BRAKE AUTO CONT

 (c)  
Move the speed brake lever to the DN position.

 S 825-131
 (19) Adjust the actuator control rod until the clearance between the actuator input and the manual input castings is 0.030 to 0.060 inch (.76-1.52mm) (Section A-A, Fig. 503).
 NOTE: Make sure the manual control rod is adjusted before you
____
 adjust the actuator control rod.

 S 825-030
 (20)
 Adjust the upstop (Detail A, Fig. 503):

 (a)  
Manually move the speed brake lever fully aft until it touches the stop on the control stand.

 (b)  
With your hands off of the lever, adjust the upstop until the head of the bolt touches the locking arm shoe.

 NOTE: Too much pressure on the locking arm shoe from the
____
 bolt will release the brake.

 (c)  Tighten the checknut on the upstop.
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747-400 MAINTENANCE MANUAL
DIFFERENTIAL
RIG
MECHANISM PIN A/S-4
(2 LOCATIONS) RIG PIN A/S-12
RIG PIN A/S-5
RIG PIN A/S-13
SEE A
TEMPERATURE
CABLE RIG LOAD - SPOILER SYSTEM
`F (C`)

TENSION 2 3
1
POUNDS
kg 1 TO MAKE SURE THAT YOU GET THE
CORRECT CABLE TENSION, LET THE
110 (43)

123
56  AMBIENT TEMPERATURE OF THE AIRFRAME STAY CONSTANT |5`F (|3`C)90 (32) 114
52
FOR A MINIMUM OF 1 HOUR.
80 (27)

110
50
2  THE SYSTEM MUST BE ADJUSTED WHEN THE CABLE LOADS ARE MORE70 (21) 106
48
THEN |15 LBS (|7 kg) FROM THE
60 (16)

102
46  TABLE VALUES.
44 3  WHEN RIGGING THE SYSTEM, CABLE
LOADS SHOULD BE |5 LBS (|2.27 kg) 40 (4) 50 (10)
97
93
42
FROM THE TABLE VALUES.
30 (-1) 89
40
10 (-12) 80
36
-10 (-23) 72
33
-30 (-34) 64
29
-40 (-40) 58
26
Speed Brake Control System Rig Pin Locations
Figure 502 (Sheet 1)

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