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B. Control Rods and Bellcranks
The output lever of the bellcrank on the aft control bulkhead connects to two control rods. The
two control rods connect to the flap bellcranks in the wings. Two short control rods attach to the
flap horns.
A short rod connects to the input lever of the bellcrank on the aft control bulkhead. The rod goes
through a hole in the aft control bulkhead. Large washers attach to the end of the rod. The
washers make a stop for the up movement of the flaps. If there is an electrical fault, the stop
protects the flaps from too much load.
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Figure 2: Flap Controls in the Aft Control Bulkhead and Wing
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C. Flap Electrical Control
Figure 3 shows the flap electrical controls. The main bus supplies power for the flaps. A 5 amp
circuit breaker protects the circuit. See Chapter 92 for the wiring diagram.
The flap electrical control system uses solid-state electronics. It has an electronic control unit
and a switchboard. The electronic control unit is located on the instrument panel. The switch
board attaches to the flap actuator.
The electronic control unit has a 3-position selector switch, solid-state logic circuits and a flap
position indicator. The selector switch can be set to:
− CRUISE (fully up). 0 ±1°
− T/O (take-off). 15 ±1°
− LDG (landing). 45 ±1°
The logic circuits monitor the outputs from the selector switch and the micro-switches on the
switch board. They control 4 power transistors. Two of the power transistors can connect the
power supply to the flap motor. The other two can connect the motor to ground.
The flap position indicator has three light-emitting diodes. The top diode lights when the flaps
are in the CRUISE position. The middle diode lights when the flaps are in the T/O position. The
bottom diode lights when the flaps are in the LDG position.
The switch board attaches to the body of the flap actuator with 2 worm-drive clamps. The switch
board has 5 micro switches. Two screws attach each micro-switch to the switch board. You can
adjust the position of the switch board with the worm-drive clamps. You can adjust each microswitch
with its attaching screws. The micro-switches have these functions:
− Micro-switch 1 - CRUISE position.
− Micro-switch 2 - CRUISE indication and T/O position moving down.
− Micro-switch 3 - T/O indication.
− Micro-switch 4 - LDG position.
− Micro-switch 5 - LDG indication T/O position moving up.
Cable harnesses with multi-pin connectors connect the components.
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Figure 3: Flap Electrical Control System
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19 Dec 1997
3. Operation
If you operate the flap selector switch these things happen:
− The switch energizes the related logic circuit.
− The logic circuit switches on the related transistors to supply power/ground to the flap motor.
− The flap motor turns the reduction gear and spindle. This moves the control rod towards the
new set position.
− The control rod turns the bellcrank around its axis.
− The bellcrank moves the two control rods in the wings.
− The two control rods move the bellcranks in the left and right wing.
− The two short control rods move the flaps.
When the flaps come to the set position:
− The cam on the flap control rod operates the related position and indication micro-switches.
− The logic circuit switches off the related transistors to de-energize the motor.
− The flap position indicator shows the new flap position.
4. Fail-Safe Operation
The flap control system has these safety properties:
− If the CRUISE position micro-switch fails closed, the stop in the aft control bulkhead prevents
damage to the flaps. The FLAP circuit-breaker opens.
− If the LDG position micro-switch fails closed, the actuator control rod contacts the end of the
actuator body after about 5mm (0.2 in) of movement. This prevents damage to the flaps.
The FLAP circuit-breaker opens.
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TROUBLE SHOOTING
1. General
The table below lists the defects you could have in the flap control system. If you have the trouble
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