27-62-00
 ALL  ú ú 03 Page 8 ú Nov 15/88
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
 5.  Speed Brake Position Warning System
___________________________________
 A.  An aural (takeoff) warning system is provided to warn against takeoff with the speed brakes on. An intermittent warning horn will sound if the thrust levers are advanced for takeoff and the speed brake control lever is not in the DOWN position. For complete description, refer to 31-26-00, Aural Warning (Takeoff Warning) System.
 6.  Ground Spoiler Control Valve
____________________________
 A.  A ground spoiler control valve (Fig. 6) controls hydraulic pressure to ground spoiler actuators. The valve is located in the right main wheel well and is bolted to a bracket on the outboard part of the wheel well forward bulkhead (Fig. 2).
 B.  The valve consists of a piston and sleeve assembly enclosed in a valve body. Drilled passages in the sleeve are connected to five external ports on the valve body. A lever which pivots about a lug on the valve body is connected to the piston. The opposite end of the lever is connected by a pushrod to a speed brake crank on the spoiler mixer. Moving the speed brake control lever causes the speed brake crank on the spoiler mixer to transmit motion through the pushrod and lever to position the valve piston.
 C.  When the speed brake control lever is in the DOWN position, the ground spoiler control valve directs hydraulic pressure directly to the down port of the ground spoiler actuator (Fig. 5). As the speed brake control lever is moved aft, the control valve moves through a neutral position where pressure is blocked and all other ports connected to return. As the speed brake lever is moved further aft, the control valve applies hydraulic pressure to the up ports of the ground spoiler actuators through the ground spoiler interlock valve. The down port of the ground spoiler actuator is connected to return through the ground spoiler control valve.
 7.  Ground Spoiler Interlock Valve
______________________________
 A.  A ground spoiler interlock valve (Fig. 6) limits use of the ground spoilers to ground operation. The valve is located above the right main gear trunnion and is secured to a bracket on the aft side of the wing rear spar (Fig. 2).
 B.  The valve consists of a three port housing with passages for hydraulic fluid and a valve slide. A bellcrank which pivots about a lug on the valve body is connected to the valve slide. The opposite end of the bellcrank connects to a ground spoiler lockout push-pull cable. The push-pull cable is routed along the right main gear drag strut and is connected to the upper torsion link.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL

TYPICAL NO. 0,1,8 AND 9 GROUND SPOILERS

TAPERED LOCKING EXTEND PORT

RETRACT PORT
TYPICAL NO. 4 AND 5 GROUND SPOILERS
Ground Spoiler Actuator
Figure 4

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

737-300/400/500MAINTENANCE MANUAL 
GROUND 
SPOILER 
ACTUATOR 
SPOILER  SPOILER  SPOILER  SPOILER  SPOILER  SPOILER 
NO. 0  NO. 1  NO. 4  NO. 5  NO. 8  NO. 9 

GROUND SPOILER  1  3 
CONTROL VALVE  2 
SEE  A  1 5  2 34  INTERLOCK GROUND SPOILER 
SYSTEM A PRESSURE  VALVE 
SEE  B 
SYSTEM A RETURN 

5
4 54 3
3
1
21
2
SPOILERS DOWN SPOILERS UP

GROUND SPOILER CONTROL VALVE
A

1
　
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