27-62-03
 ALL  ú ú 03 Page 201 ú Feb 15/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

 (2)  
AIPC 27-62-55-01, Fig. 1

 B.
Access

 (1)  
Location Zone
 211, 212 Passenger Cabin - Nose to First Door

 C.
Procedure

 S 862-028
 (1)  
Open these circuit breakers and attach DO-NOT-CLOSE tags:

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

 S 012-044
 (2)  
Remove the ceiling lining panel on the left side at station 325 (AMM 25-59-01/401).

 S 032-030

 (3)  
Remove the speed brake cables SBA and SBB from the mechanism:

 (a)  
Loosen the turnbuckles on the speed brake cables.

 (b)  
Remove the cables from the mechanism.

 NOTE: The installation of cable clamp blocks may prevent a
____ loose cable from moving off the pulleys.
 S 022-031
 (4)  
Remove the speed brake mechanism:

 (a)  
Remove the tension spring from the cam follower lever and move the lever away from the mechanism.

 (b)  
Remove the rod, bolt, washer, nut and spacer to disconnect the manual input control rod from the mechanism.

 (c)  
Remove the actuator input control rod from the idler crank: 1) Remove the bolt, washer, nut and spacer from the idler crank. 2) Loosen the locknut on the rod end at the speed brake

 mechanism. 3) Remove the rod from the rod end at the mechanism.

 (d)  
Remove the bolt, washer and nut to disconnect the input control rod for the transducer from the mechanism.

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 27-62-03
 ALL  ú ú 04 Page 202 ú Jun 18/01
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MAINTENANCE MANUAL

TENSION SPRING
FLIGHT DETENT 0.12-0.14 INCH
1
CAM (3.0-3.6 mm)
CAM FOLLOWER ROLLER CAP RETAINING
LOWER SUPPORT NUT
BRACKET ACTUATOR INPUT
SB-3 CONTROL RODRIG PIN
HOLE CHECKNUT
ARMING SWITCH 1
UPSTOP
ARMING SWITCH
12
ACTUATOR INPUTSTRIKE PLATELOCKING CONTROL ROD
ARM SHOE
MANUAL INPUT 0.07-0.09 INCH SWITCH
CONTROL ROD (1.78-2.29 mm) POINT FWD
ACTUATION
A
FLIGHT 
SPEED BRAKE CONTROL LEVER POSITION DOWN  UP POSITION FLIGHT DETENT (STOP) POSITION  MANUAL INPUT CASTING 
ACTUATOR INPUT CASTING CLEARANCE (0.76-1.52 mm) 0.03-0.06 INCH FWD 
STOP LEVER INFLIGHT  SEE SEE A NUT  B  ____ NOTE:  IN THE DOWN POSITION. SHOWN WITH THE SPEED BRAKE CONTROL HANDLE A-A 
MANUAL INPUT CONTROL ROD  A 

ACTUATOR INPUT CONTROL ROD
1  THE SPEED BRAKE CONTROL LEVER IS IN THE DOWN POSITION.
DRUM MECHANISM
A
2  THE SPEED BRAKE CONTROL LEVER IS IN THE UP POSITION.
ARMING AUTOMATIC SPEED SWITCH BRAKE ACTUATOR
Speed Brake Mechanism Installation Figure 201 (Sheet 1)
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MAINTENANCE MANUAL

LOCKING
ARM SHOE

B-B 
NOTE:____  SHOWN WITH THE CONTROL HANDLE 
IN THE DOWN POSITION. 

Speed Brake Mechanism Installation
Figure 201 (Sheet 2)

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