29-33-00
ALL ú ú 03 Page 4 ú Jun 15/87
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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757
MAINTENANCE MANUAL
F. Quantity Monitor Unit
(1) The monitor unit changes the signal from the quantity transmitters into voltage signals to the EICAS computer, the low quantity lights, and the remote quantity gage.
3. Operation
_________
A. Functional Description (Fig. 3)
(1)
A change in the reservoir fluid level causes a change in the capacitance of the quantity transmitter. The quantity monitor unit converts the change in capacitance into a voltage signal to the EICAS computer. The computer causes a digital readout of the system quantity (in percent of full) to appear on the EICAS display. The EICAS will display system quantity in the status and maintenance modes. The monitor unit also sends a voltage signal through the reservoir fill selector valve switch to the remote quantity indicator. This moves the indicator needle to a fluid quantity reading. The reservoir fill valve switch selects the system quantity to be displayed on the remote indicator.
(2)
When the capacitance of the transmitter corresponds to a fluid level of 0.45 or less, the monitor unit activates a fluid quantity warning light. The monitor unit also signals the EICAS computer to display a (L, R, C) HYD QTY low quantity message.
(3)
A refill indication is generated in the EICAS computer if the EICAS quantity readout is at .75 or below. A RF (refill) indication next to the digital readout of fluid quantity is displayed in the EICAS status and maintenance modes.
(4)
An overfull indication is generated in the EICAS computer if the EICAS quantity readout is at 1.22 or above. An OF (overfull) indication next to the digital readout of fluid quantity is displayed in the EICAS maintenance mode. In addition, a (L, R, C) HYD SYS O/FULL message is displayed on the EICAS maintenance page.
(5)
For additional information on the EICAS, refer to AMM 31-41-00.
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29-33-00
ALL ú ú 04 Page 5 ú Jan 28/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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MAINTENANCE MANUAL
TO HYD RSVRCONTROL PANELHYD SYS
PRESS SYS(LOW PRESS)
Hydraulic Quantity Indicating System SchematicFigure 3
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29-33-00
ALL ú ú 01 Page 6 ú Jan 28/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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757
FAULT ISOLATION/MAINT MANUAL
HYDRAULIC FLUID QUANTITY INDICATING SYSTEM
COMPONENT FIG. 102 SHT QTY ACCESS/AREA REFERENCE
CIRCUIT BREAKERS 1 FLIGHT COMPARTMENT, P11 PANEL
HYDRAULICS QTY CTR, C4192 1 11K19 *
HYDRAULICS QTY LEFT, C1101 1 11K20 *
TION, R10196 RIGHT SYSTEM - HYDRAULIC QUANTITY ISOLA-LEFT SYSTEM - HYDRAULIC QUANTITY ISOLATION, TION, R10195 CENTER SYSTEM - HYDRAULIC QUANTITY ISOLA-COMPUTER - (REF 31-41-00, FIG. 101) EICAS L, M10181 EICAS R, M10182 DIODE - (REF 31-01-36, FIG. 101) R10194 INDICATOR - (REF 29-18-00, FIG. 101) RESERVOIR FILL, N29 HYDRAULICS QTY RIGHT, C4193 1 11K21 *
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