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B.  Spoilers are attached to the wing structure by four hinge fittings equipped with self-aligning bearings (Fig. 3). The flight spoilers are located forward of the outboard flaps and are attached to wing structure aft of the rear spar. The four flight spoiler actuators are attached between the spoilers and wing structure at the spanwise center of each spoiler. Bonding jumpers provide an electrical bond between spoilers and wing structure. On some airplanes, a blade seal along the bottom length of the spoiler acts as a dam to limit excessive air leakage through the flaps.
C.  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 spoilers and the outboard flap. In flight, the flap will move up due to airloads, and the phenolic rub strip may contact the abrasion resistant finish on the upper surface of the flap.
500 
27-61-0 Page 4  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  Jun 20/85 

G29084
500  Flight Spoiler 
Feb 20/85  Figure 3  27-61-0 
Page 5 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

3.  Spoiler Ratio Changer
A.  The spoiler ratio changer is a mechanical device, which receives an input from the aileron control system and transfers it to the spoiler mixer to initiate spoiler action. For a given magnitude of input from the aileron system, the ratio changer varies the magnitude of the output to the spoiler mixer, depending on speed brake lever setting. The output decreases as speed brakes are raised.
B.  The spoiler ratio changer is mounted on the forward bulkhead of the right wheel well. (See figure 4.) The ratio changer case supports spoiler output quadrants and a speed brake quadrant. A ratio changer input rod from the spoiler control quadrant, connects to a bell crank which is mounted on the ratio changer case. (See figure 5.) The bell crank is slotted to receive two rollers. These rollers engage the slots and are connected to a lever and a link. The lever is connected to a crank on the ratio changer output shaft. The link is attached to a fork lever assembly, which is connected to the speed brake quadrant by a two-part link. Action of the speed brake quadrant will cause motion of the rollers in the bell crank. Moving the speed brake quadrant to raise the spoilers will cause the rollers to move toward the bell crank pivot. This will cause a decrease in the magnitude of the ratio changer output for a given input. During normal operation, the two-part link attached to the speed brake quadrant is maintained at a fixed length by a bungee spring. In the event that the ratio changer should jamb, the bungee will allow the two-part link to become longer as the speed brake quadrant is rotated in the down direction. The speed brake quadrant has a fixed stop in the speed brake down position and an adjustable stop in the speed brake up direction.
4.  Spoiler Mixer
A.  The spoiler mixer combines aileron input from the spoiler ratio changer with speed brake lever position. It allows the flight spoilers to augment lateral control of the airplane even when they are simultaneously being used as speed brakes.
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27-61-0 Page 6  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  Nov 15/66 

G29070 G29352
500  Spoiler Ratio Changer and Mixer 
Aug 15/67  Figure 4  27-61-0 
Page 7 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

Spoiler Ratio Changer and Mixer Schematic  500 
27-61-0  Figure 5  Nov 15/66 
Page 8 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

B.  The spoiler mixer assembly is mounted on the spoiler ratio changer, which is located on the forward bulkhead of the right wheel well. (See figure 4.) The housing is fastened t o the ratio changer by four bolts and four splined shafts which mate with the ratio changer. These shafts are speed brake input, aileron input, left spoiler output and right spoiler output. An additional shaft on the mixer provides the speed brake signal to the ground spoiler control valve. The housing of the spoiler mixer contains an aileron cam and related levers and links. (See figure 5.) Sealed bearings are used in all linkages, so the housing contains no oil. The spoiler mixer may be removed from the airplane without disturbing the rigging of the cables or linkage, which are mounted on the ratio changer.
C.  Counterclockwise rotation of the speed brake quadrant repositions the linkage in the mixer and results in an "up" signal to both left and right output quadrants. Conversely, clockwise rotation results in a "down" signal at both output quadrants. Aileron signals received by the spoiler mixer, from the ratio changer rotate the cam inside the mixer. Clockwise rotation of the cam repositions the linkage in the mixer. This moves the left output quadrant to provide an "up" signal and the right output quadrant to provide a "down" signal. Conversely, counterclockwise rotation of this cam provides a "down" signal to the left output quadrant and an "up" signal to the right output quadrant. Simultaneous inputs from aileron and speed brake systems will cause motion of these output quadrants in a combined manner, providing lateral control from flight spoilers with speed brakes on.
　
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