G37400G43215
Ground Spoiler Actuator 504
27-62-0 Figure 4 May 15/68
Page 10
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
504 Speed Brake Hydraulic Schematic
Feb 20/93 Figure 5 27-62-0
Page 11
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
8. Ground Spoiler Actuator
A. The ground spoilers are positioned by actuators powered by hydraulic system A. The actuators used on ground spoilers 1 and 8 are identical as are ground spoiler 4 and 5 actuators. However, the actuators used on ground spoilers 1 and 8 are not identical with the actuators used on ground spoilers 4 and 5.
B. No. 1 and No. 8 Ground Spoiler Actuators.
(1)
The actuators are attached at the piston rod end to the spoiler and at the cylinder end to a support on the wing rear spar.
(2)
The actuator contains a locking mechanism which locks the actuator in the retract position. (See figure 4.) The locking mechanism consists of a spring-loaded tapered locking piston and two locking segments or keys. When the actuator reaches the retract position, the spring-loaded piston is forced downward by hydraulic pressure. This forces the locking segments in a radial direction into a cavity whose diameter is slightly larger than the cylinder inside diameter, thus locking the actuator. If hydraulic pressure is lost, the spring will hold the piston in the locked position. Directing hydraulic pressure to cause reverse actuation provides a force on the piston greater than the spring force thus moving the piston inward. This allows the locking segments to move inward unlocking the actuator.
(3)
Swivel joints in the hydraulic lines allow the actuators to rotate as the spoilers raise.
C. No. 4 and No. 5 Ground Spoiler Actuator
(1)
Two identical actuators and actuator linkages used to position each ground spoiler. The actuators are attached at the cylinder end to a support on the wing rear spar. The actuator piston rod end is attached to the ground spoiler actuator linkage.
(2)
The actuators for ground spoilers 4 and 5 are similar to the actuators used on ground spoilers 1 and 8 except the locking mechanism locks the actuator in the extend position.
9. No. 4 and No. 5 Ground Spoiler Actuator Linkage
A. A ground spoiler actuator linkage connects each ground spoiler actuator to the ground spoiler. (See figure 2.) The actuator linkage consists of an idler crank and pushrod. The idler crank is pivoted in the actuator support. The actuator piston rod end is attached to one end of the idler crank and the pushrod to the other end. The ground spoiler is attached to the pushrod end.
504
27-62-0 Page 12 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. Nov 15/67
B. When the actuator is retracted, the idler crank pivots pushing the pushrod which moves the ground spoiler to the raised position.
10. Operation
A. The speed brakes are activated by moving the speed brake control lever aft. This is done manually or by the speed brake lever actuator (Fig.\2). Initially the control lever must be raised to release the lever latch. As the lever is moved aft, lever motion is transferred through control rods to release the lever brake and rotate the speed brake forward drum. Cables from the forward drum, transfer speed brake signals to the speed brake quadrant at the spoiler ratio changer. Motion of the speed brake quadrant operates the ratio changer. Also, the speed brake quadrant transfers motion to the spoiler mixer, driving both mixer output drums in the spoiler "up" direction. This causes flight spoilers 2, 3, 6 and 7 to rise equally. The motion of the spoiler mixer also positions the ground spoiler control valve.
B. When the airplane is airborne, the right main gear shock strut is extended and the push-pull cable closes the ground spoiler interlock valve. This valve blocks pressure from the ground spoiler control valve causing the ground spoilers to remain faired. The speed brake lever may be rotated aft to the FLIGHT DETENT. This is the maximum in-flight speed brake setting. A double acting lever brake, incorporated in the speed brake drum mechanism, retains the lever at the selected setting between DOWN and the FLIGHT DETENT. With the speed brakes in use, rotation of the aileron control wheels will cause further operation of the flight spoilers. Rotating the control wheels will lower the flight spoilers on the wing going up and raise the flight spoilers on the wing going down. As speed brakes are applied, the ratio changer reduces the amount of roll control input to the spoiler mixer for a given control wheel position. This reduces the angular change in spoiler position for a given roll control input.
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