B.  
Access

 (1)  
Location Zone
 221 Control Cabin, LH

 C.  
Procedure

 S 864-013
 WARNING: MAKE SURE TO OPEN THE CIRCUIT BREAKERS FOR THE CAPTAIN'S AND
_______ FIRST OFFICER'S SEATS BEFORE YOU DO WORK AROUND THEM. A FAILURE TO OPEN THE CIRCUIT BREAKERS CAN CAUSE THE SEATS TO MOVE ACCIDENTALLY. THIS CAN CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
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MAINTENANCE MANUAL

 (1)
Open these circuit breakers and attach DO-NOT-CLOSE tags:

 (a)  
P414, Power Distribution Center - Left 1) 414D8, CAPT PWR SEAT

 (b)  
P415, Power Distribution Center - Right 1) 415H32, F/O POWER SEAT

 S 014-002
 (2)  
Remove the left cover assembly from the control stand.

 S 864-003

 (3)
Open these circuit breakers and attach DO-NOT-CLOSE tags:

 (a)  
P7, Overhead Circuit Breaker Panel
 1) 7G6, SPEED BRAKE AUTO CONT

 S 024-004
 (4)  
Remove the switch:

 (a)  
Disconnect the electrical wires from the terminal block T715.

 (b)  
Remove the screws that attach the switch.

 (c)  
Remove the switch from the airplane.

 TASK 27-62-09-404-005
 3. Reverse Thrust Lever Operated Arming Switch Installation (Fig. 401)
________________________________________________________
 A. Standard Tools and Equipment
 (1)  
Block/shim - to lift the switch actuating arm.

 B.
References

 (1)  
AMM 24-22-00/201, Manual Control

 (2)  
AIPC 27-62-11, Fig. 1

 C.
Access

 (1)  
Location Zone
 221 Control Cabin

 D.
Procedure

 S 424-006
 (1)  
Install the switch:

 (a)  
Attach the switch to the bracket with the two screws and washers.

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747-400
MAINTENANCE MANUAL

FORWARD
COVER
ASSEMBLY

SPEED BRAKE LEVER
DETENT PLATE
SEE A
ACTUATING LEVER
SEE B
LINKAGE
LEFT COVER

ADJUSTMENT
ASSEMBLY

ROD
SWITCH ADJUSTMENT SCREW
REVERSE THRUST SEE CLEVER OPERATED ARMING SWITCH
TERMINAL
BLOCK T715
A
DETENT PLATE TOPDIMENSION X SHAFT
SHAFT SUPPORT
CAM
ACTUATING  0.01-0.02 INCH FOLLOWER
LEVER  (0.25-0.51 mm)
BOTTOM SHAFT
B C
Reverse Thrust Lever Operated Arming Switch Installation
Figure 401

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747-400 MAINTENANCE MANUAL
 (b)  Connect the electrical wires to the terminal block T715.
 S 834-007
 (2)  
Adjust the actuating lever:

 (a)  
Put all thrust levers in the IDLE STOP position with the reverse thrust levers down.

 (b)  
Adjust the linkage adjustment rod until the clearance between the bottom of the actuating lever and the detent plate is 0.01-0.02 inch (.25-.51 mm) (Detail B).

 (c)  
Move the reverse thrust lever No. 2 to the full reverse thrust position.

 (d)  
Do a check on the operation of the speed brake lever.
　
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