Trailing Edge Flap Position Indicating System Schematic
Figure 3
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(3)
The normal FLAPS display consists of a single white tape which represents TE flap position and a bar across the tape which indicates position of the flap lever. A number appears next to the bar when the flap lever is in one of the detented positions. The white tape moves with the slowest TE flaps during extension or retraction until the flaps reach the selected flap lever position. The bar and number are magenta in color when flaps are in transit, and change to green when all TE and LE flaps agree with flap lever position.
(4)
The expanded FLAPS display appears automatically when primary electric flaps are enabled, when there is flap asymmetry or disagreement with flap lever position, or when any LE or TE flap position data are determined to be invalid. This display consists of 4 white tapes which indicate position of each TE flap, a split bar across the tapes with a number which indicates position of the flap lever, and 6 box-shaped symbols above the tapes which indicate position of the LE flaps.
(a)
The tapes and bar with number function the same as for the normal FLAPS display, except that the tape appears in amber if that TE flap is in asymmetry or disagrees with the flap lever position. If position data for any TE flap is invalid (RVDT failure, interface failure, or loss of excitation), the letter x will appear in amber inside the tape for that flap.
(b)
The 6 box-shaped symbols above the tapes indicate status of the inboard, midspan, and outboard groups of LE flaps on each wing. The box outline appears alone in white for LE flaps fully retracted, the entire box is shaded green for LE flaps fully extended, and the box is crosshatched in white for LE flaps in transit. Any of these symbols appears in amber to indicate a disagreement with flap lever position.
(c)
When any LE position data is invalid (LE flap position switch indicates extended and retracted simultaneously), the corresponding LE indicator box outline will appear in white with an amber x inside.
(5)
The alternate FLAPS display appears automatically when alternate flaps are selected with the flap ALT ARM switch or when all 3 flap control units fail. This display is the same as the expanded flaps display except that the flap lever position bar and number do not appear, and flap position scales appear next to the outer tapes.
(6)
The standby power system provides excitation to the RVDT transmitters on the right wing but not on the left wing. If standby power is used, the multiple flap display will appear with an amber x in the left wing display tapes and the bar and number will be magenta. All TE flaps will drive to the flap lever position indicated next to the right wing display tapes.
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B. Control
(1)
Operation of the trailing edge flap position indicating system is automatic. The FLAPS display appears on the main EICAS when the flap lever is not in the full UP detent or any flap is not fully retracted.
(2)
The flight controls maintenance page may be called up on the auxiliary EICAS display. This page displays the values of trailing edge flap angular displacement as numeric readouts for trouble shooting.
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