27-62-00
 ALL  ú ú 01 Page 3 ú Oct 25/85
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

737-300/400/500
MAINTENANCE MANUAL

SPEED BRAKE CONTROL LEVER
CONTROL
SPEED BRAKE
RODS
ARMING SWITCH (S276)
CONTROL
DETENT

CABIN IDLER LINK CAM
FLOOR DETENT SPEED BRAKE SPRING LEVER POSITION SENSOR 1
DETENT
ROLLER
ARM

SPEED BRAKE
FORWARD DRUM SPEED BRAKE LEVER ACTUATOR
SPEED BRAKE
CONTROL

FWD INBD
CABLES
PHENOLIC CAM
A
1 AIRPLANES WITH SPEED BRAKE LEVER POSITION SENSOR
Speed Brake Control System Component Location Figure 2 (Sheet 2)
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 27-62-00
 ALL  ú ú 02 Page 4 ú Nov 15/88
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 D.  The ground spoilers have two positions, fully retracted or fully raised. The fully raised position for all the ground spoilers is 60 degrees. Ground spoilers 0, 1, 8, and 9 are each actuated directly by a single locking actuator. Ground spoilers 4 and 5 are each actuated by two locking actuators which drive individual linkages (Fig. 2). Hydraulic power for all ground spoilers is from hydraulic system A. This ground spoiler hydraulic pressure does not pass through the spoiler valves on the flight controls hydraulic modular package. Thus, the spoiler switches which control these valves have no effect on ground spoiler operation.
 E.  The flight spoilers will be positioned between 0 degrees and full up depending on speed brake lever position. The full up position for all flight spoilers is 40 degrees.
 F.  A speed brake warning system provides an aural warning to prevent takeoff with the speed brakes raised or speed brake control lever in ARMED position (Ref 31-26-00).
 2.  Ground Spoiler Panel____________________
 A.  Ground spoilers 0, 1, 8, and 9 are located outboard of the flight spoilers. Ground spoilers 4 and 5 are located inboard of the engines (Fig. 1). The ground spoilers are constructed of graphite/epoxy over a nomex honeycomb core for weight savings. A continuous phenolic rub strip is bonded to the lower surface at the trailing edge. Dacron covered silicon rubber seals are installed at each end and at the forward edge. The seals at each end are adjustable. Ground spoilers 4 and 5 are interchangeable between themselves. Ground spoilers 0, 1, 8, and 9 are interchangeable between themselves.
 B.  The ground spoilers are attached to wing structure by four hinge fittings equipped with self-aligning bearings. Ground spoilers 0, 1, 8, and 9 are located forward of the outboard flaps and are attached to wing structure aft of the rear spar. Ground spoilers 4 and 5 are located forward of the inboard flaps and are attached to wing structure aft of the rear spar and landing gear support beam. The actuators for ground spoilers 0, 1, 8, and 9 are attached directly to the spoilers and wing structure at the center of each spoiler. The actuators for ground spoilers 4 and 5 are attached directly to wing structure and through an actuator linkage to the spoilers. Bonding jumpers provide an electrical bond between the ground spoilers and wing structure.
 C.  The ground spoilers are constructed with a straight trailing edge. When the spoilers are down, the down limit is provided by bottoming the piston in the actuator. In this position, a clearance is maintained between the outboard flaps and ground spoilers 0, 1, 8, and 9. On ground spoilers 4 and 5, the actuator linkage is adjusted to maintain the clearance between the inboard flaps and the spoilers. In flight, the flap will move up due to airloads; and the phenolic strip may contact the abrasion resistant finish on the flap upper surface.
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 27-62-00
 ALL  ú ú 05 Page 5 ú Nov 15/88
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
 3.  Speed Brake Control Lever
_________________________
 A.  Manual control signals to the speed brake control system are applied at a speed brake control lever (Fig. 2). The speed brake control lever is located on the left side of the control stand. The control lever handle extends above the control stand through a cutout in the cover. An indicator on the lever follows a plate on the stand. The plate is marked at the DOWN and UP positions with additional markings at the ARMED detent and FLIGHT detent.
　
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