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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
Purpose
The elevator tab control mechanism changes the function of the
elevator tab. This helps increase the nose up control of the
airplane.
Location
The elevator tab control mechanism attaches to the rear spar
on each side of the stabilizer. The solenoid control valves attach
to a bracket on the station 1156 bulkhead.
Physical Description
Each elevator tab control mechanism contains these
components:
* Actuator
* Crank (2)
* Spring (4)
* Frame
* Up stop.
The elevator tab control mechanism attaches to the aft edge of
each elevator. The elevator tab control mechanism frame
attaches to the stabilizer structure. The cranks attach to the two
tab control rods. The actuator housing attaches to a pin that
connects the two cranks. The piston of the actuator attaches the
fixed support structure of the frame. The four springs connect to
the crank and to the fixed support structure.
Functional Description
When the flaps are up, the elevator tab operates in the balance
mode. As the elevator moves, the tab moves in a direction that
is opposite to the direction of elevator movement. In the balance
mode, the tab moves 0.75 degrees for each degree of elevator
movement.
When the flaps are not up and hydraulic power is on, the
elevator tab operates in the anti-balance mode. The actuator
extends, moves the crank and repositions the elevator balance
tab rods. When the elevator moves, the elevator tab moves in
the same direction that the elevator moves. In the anti-balance
mode, the tab moves 0.50 degrees for each degree of elevator
movement.
ELEVATOR AND TAB CONTROL SYSTEM - ELEVATOR TAB CONTROL MECHANISM
EFFECTIVITY
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Functional Description
In the balance mode (TE flaps up), the solenoid control valves
de-energize. When the control valve is de-energized, four
springs move the elevator tab actuator to the retract position.
This lets the elevator tab move in the opposite direction from
the elevator movement.
The left solenoid control valve energizes when the TE flaps are
not up, and the FCCs send signals to the left solenoid control
valve. This connects system A pressure to the actuator.
Because the rod end of the actuator attaches to the fixed
frame, the actuator housing moves. This causes the crank to
move and lets the elevator tab move in the same direction as
the elevator, or the anti-balance mode of operation.
The right solenoid control valve energizes when the TE flaps
are not up, and a ground goes to the 10-second delay relay. The
purpose of the 10-second delay relay is to improve autopilot
performance. When the relay energizes, power goes to operate
the solenoid control valve. The solenoid control valve connects
system B pressure to the right actuator. This causes the crank
to move and lets the elevator tab move in the same direction as
the elevator, or the anti-balance mode of operation.
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ELEVATOR AND TAB CONTROL SYSTEM - ELEVATOR TAB CONTROL MECHANISM - FUNCTIONAL DESCRIPTION
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