The FSEU 1 is on the E1-6 shelf. The FSEU 2 is on the E4-1 shelf.
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TRAILING EDGE FLAPS -COMPONENT LOCATIONS -1
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TRAILING EDGE FLAPS -COMPONENT LOCATIONS -2
General
The flap components are in these areas:
*
The main landing gear wheel wells
*
The wings.
Main Landing Gear Wheel Well Components
The flap primary control valve and the flap/slat priority valve attach to the keel beam in the right wheel well.
The flap PDU attaches to the top of the keel beam. Access to the flap PDU is through the left or right wheel well.
The flap position sensor gearboxes attach to brackets on the floor beams. One of these gearboxes is in the right wheel well and the other is in the left wheel well.
The inboard flap inboard transmissions, side-of-body angle gearboxes, and some of the torque tubes are also in the wheel wells.
Wing Components
The outboard flaps, inboard main flaps, and inboard aft flaps are on the wings. Most of the flap transmissions and ballscrews are under the wings. Remove the flap support fairings under the wing or extend the flaps to get access to the transmissions and ballscrews.
The rear spar angle gearboxes, the no-back brakes, and some of the torque tubes attach to the rear spar of the wings. Access to the gearboxes is through panels under the wings. Extend the flaps to get access to the torque tubes and the no-back brakes.
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TRAILING EDGE FLAPS -COMPONENT LOCATIONS -2
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TRAILING EDGE FLAPS -FLAP LEVER AND FLAP LEVER POSITION SENSOR
Purpose
The pilots use the flap lever to control the position of the flaps and slats in the primary and secondary modes. The flap lever position sensor sends input position signals to the FSEUs.
Physical Description
The flap lever has detent positions at UP, 1, 5, 15, 20, 25, and 30. Gates at detents 1 and 20 help the flight crew to identify these positions during climb-out and go-around.
The flap lever connects with a crank and a control rod to the brake mechanism. The flap lever position sensor attaches to the brake mechanism. The position sensor has a splined shaft with a missing tooth to help align the position sensor with the brake mechanism.
The flap lever position sensor has four internal rotary variable differential transformers (RVDTs). The assembly is an LRU, but the RVDTs are not LRUs.
Location
The flap lever is on the right side of the P10 control stand. The brake mechanism and the flap lever position sensor are in the control stand.
Functional Description
When the pilots move the flap lever, the control rod turns the spline in the brake mechanism. The spline then drives the position sensor. If the control rod disconnects, the brake mechanism prevents movement of the RVDTs.
Training Information Point
After you install the flap lever position sensor, do the LRU replacement test. To do this test, move the flap lever to each detent and check the value of each RVDT on the high lift maintenance page.
During installation of the brake mechanism, adjust the control rod to align the index tooth with the index bolt hole.
If you replace only the flap lever position sensor without removal of the brake mechanism, it is not necessary to adjust the control rod.
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TRAILING EDGE FLAPS -FLAP LEVER AND FLAP LEVER POSITION SENSOR
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TRAILING EDGE FLAPS -ALTERNATE FLAPS PANEL
Purpose
The two switches on the alternate flaps panel are:
*
The alternate flaps arm switch
*
The alternate flaps selector.
These switches control the flaps and slats in the alternate mode.
Physical Description
The alternate flaps arm switch is a guarded, alternate action switch. When you push the switch, ALTN shows.
The alternate flaps selector has these detents
*
OFF
*
RET
*
EXT.
Location
The alternate flaps panel is on the right side of the P10 control stand.
Operation
To engage the alternate mode, push the alternate flaps arm switch. To extend the flaps and slats in the alternate mode, turn the alternate flaps selector to the EXT position. Turn the selector to the OFF position to stop the movement of the flaps and slats. To retract the flaps and slats, turn the selector to the RET position.
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