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A
737-300/400/500MAINTENANCE MANUAL
SEE A
SPOILER PHENOLIC RUB ACTUATOR STRIP
ADJUSTABLE SEAL
BLADE
SEAL
BONDING SPOILER HINGE ACTUATOR
JUMPER BEARING ROD END
FWD INBD
A
Flight Spoiler Figure 3
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
3. Spoiler Ratio Changer
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A. The spoiler ratio changer is a mechanical device which receives an input from the aileron control system and transfers the input 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 (Fig. 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 mounted on the ratio changer case (Fig. 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 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
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A. The spoiler mixer combines aileron input from the spoiler ratio changer with speed brake lever position. The mixer allows the flight spoilers to augment lateral control of the airplane even when simultaneously being used as speed brakes. The spoiler mixer contains a no-back device to ensure that spoiler authority for lateral control is maintained if speed brake cable failure occurs.
B. The spoiler mixer assembly is mounted on the spoiler ratio changer located on the forward bulkhead of the right wheel well (Fig. 4). The housing is fastened to 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 (Fig. 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 mounted on the ratio changer.
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