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 27-58-41
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 C. Procedure
 S 424-005
 (1)  
Install the position indicator:

 (a)  
Connect the electrical connector to the indicator.

 (b)  
Install the indicator in the panel.

 S 864-006
 (2)  
Supply the electrical power (Ref 24-22-00/201).

 S 864-007

 (3)
Remove the DO-NOT-CLOSE tags and close these circuit breakers:

 (a)  
P6-2 Panel
 1) TE FLAP POS IND

 S 864-008
 (4)  
Supply the system B hydraulic power (Ref 27-51-00/201).

 S 864-009

 (5)  
Put the flap control lever in the UP detent to retract the flaps.

 (a)  
Stop for two minutes to permit the flaps to fully retract.

 S 864-010
 (6)  
Remove the system B hydraulic power (Ref 27-51-00/201).

 S 714-011

 (7)  
Do a test of the flap asymmetry system:

 (a)  
Put the asymmetry test switch in the L position. 1) Make sure the asymmetry test light is on.

 (b)  
Release the test switch.
 1) Make sure the test light is off.

 (c)  
Put the test switch in the R position.
 1) Make sure the test light is on.

 (d)  
Release the test switch.
 1) Make sure the test light is off.

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 27-58-41
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 (8)  S 724-012Do the test of the trailing edge flap position indicating system (Ref 27-58-01/501). (a) Make sure the pointers on the position indicator agree with the position of the flaps.
 (9)  S 864-013Remove the system B hydraulic power (Ref 27-51-00/201).
 S 864-014

 (10) Remove the electrical power (Ref 24-22-00/201).

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 27-58-41
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 FLIGHT SPOILER CONTROL SYSTEM - DESCRIPTION AND OPERATION
_________________________________________________________
 1.  General_______
 A.  The flight spoiler control system supplements the ailerons in providing lateral control. The spoilers are numbered 0 thru 9 from left to right. The flight spoilers, 2, 3, 6, and 7 are located outboard of the engines (Fig. 1). The ground spoilers 0, 1, 8, and 9 are located farthest outboard on the wings. The ground spoilers, No. 4 and 5, are located inboard of the engines (AMM 27-62-00, Speed Brake Control System, for ground spoiler control). The spoilers lie flush with the upper wing surface when not in use, and can be raised to various angles when in use. The flight spoilers may also act as speed brakes. Spoiler position sensors are installed on spoilers No. 2 and 7 to provide an electrical signal to indicate spoiler position (AMM 22-11-27, Spoiler Position Sensor).
 B.  When functioning as spoilers, the flight spoiler panels raise on the wing on which the aileron rotates up. The spoiler panels on the down aileron wing remain faired. When used as speed brakes, the spoiler panels on both wings raise. With speed brakes on, the spoiler panels on the up aileron wing will be raised more than those on the down aileron wing. This allows the flight spoilers to provide lateral control and speed brake operation simultaneously.
 C.  Aileron control wheel rotation directs flight spoiler motion for lateral control (Fig. 2). Input to the spoiler control system is normally through an aileron spring cartridge which connects the aileron bus drums to a spoiler ratio changer. The spoiler ratio changer reduces the magnitude of the lateral control input to the spoiler control system when speed brakes are used. The amount of reduction depends on the speed brake lever position, with zero speed brakes giving maximum input. A spoiler mixer combines the lateral control inputs with speed brake inputs to move control cables routed along the rear spars of the wings to spoiler actuator quadrants. The spoiler actuator quadrants position control valves in spoiler actuators and allow hydraulic pressure to position the spoilers. As the actuators move to position the spoilers, the valves are returned to the closed position. This provides a follow-up action so that the spoilers are hydraulically held in the desired position.
　
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