*
The secondary mode display
*
The alternate mode display.
Failure Detection
Monitors in the FSEUs compare the flap position data to the flap commands. These monitors find failures in the HLCS and the flap drive system.
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FLAP POSITION INDICATION -GENERAL DESCRIPTION
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FLAP POSITION INDICATION -FLAP POSITION SENSORS AND GEARBOX
Purpose
The flap position sensor gearboxes transmit the flap torque tube position to the flap position sensors. The flap position sensors supply flap position data to the FSEUs for flap control, flap position indication, and failure detection.
Location
The flap position sensor gearboxes attach to the floor beams in the left and right main gear wheel wells. The gearboxes are between the flap PDU and the inboard flap inboard transmissions. The flap position sensors are on the flap position sensor gearboxes. The gearbox in the right wheel well also has the flap limit switch.
Physical Description
The flap position sensor gearboxes have a rig indicator that shows when the flaps are at the UP position. The indicator has a mark that turns with the flap drive. When the mark aligns with the fixed index, the flap drive is at the UP position.
There is a manual drive connection on each gearbox that permits you to manually drive the flaps. The manual drive input shaft has a shearout feature. Remove the manual drive cover to get access to the manual drive input shaft.
The flap position sensors are resolvers and they each have a rig indicator. The rig indicator has two marks that turn when the position sensor shaft turns. The two marks are in line when the flap drive line is at the UP position. All of these sensors are interchangeable with each other and with the slat position sensors.
Training Information Point
Install the flap position sensor gearboxes with the flaps at the UP position. Make sure the index mark for the rig indicator aligns with the fixed index.
Install the flap position sensor with the flap drive line in the UP position. Make sure that the index marks on the position sensor are aligned when you install the sensor. If the index marks on the position sensor are not aligned, you must push the shaft lock pin to turn the shaft. The shaft lock pin is next to the shaft.
When you manually operate the flap drive system, observe these cautions:
CAUTION: DO NOT TURN THE MANUAL DRIVE WITH MORE THAN 1200 POUND-INCHES TORQUE OR FASTER THAN 400 RPM. YOU CAN CAUSE DAMAGE TO THE POSITION SENSOR GEARBOX AND THE TORQUE TUBES.
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FLAP POSITION INDICATION -FLAP POSITION SENSORS AND GEARBOX
CAUTION: DO NOT LET THE BALLSCREW NUTS HIT THE UPSTOPS OR THE DOWNSTOPS. YOU CAN CAUSE DAMAGE TO THE SHEAROUT IN THE POSITION SENSOR GEARBOX.
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FLAP POSITION INDICATION -FLAP POSITION SENSORS AND GEARBOX
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FLAP POSITION INDICATION -FUNCTIONAL DESCRIPTION
General
There are four flap position sensors, two for the right wing flaps and two for the left wing flaps. Each FSEU interfaces with one sensor for the left flaps and one sensor for the right flaps. Separate power sources supply electrical power to the sensors.
Functional Description
The flap position sensors send flap position data to both the control and monitor channels. Both of these channels use this data for:
*
Flap position indication
*
Primary mode control
*
Secondary mode control
*
Failure detection.
See the high lift control section for more information about the indications (SECTION 27-03).
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