For information on the EICAS, refer to 31-41-00.
B. Low Pressure Lights (Fig. 1)
(1)
Three system low pressure lights are on the hydraulic control panel. The system light turns on when activated by the low pressure switch. In the left and right systems, the switch is on the EDP pressure/case drain filter module. In the center system, the switch is on the ACMP pressure/case drain filter module.
(2)
A low pressure light is provided on the hydraulic control panel for each pump. The lights are in the pump select switches. A pump low pressure light illuminates if the output of a pump in operation becomes low. The low pressure switches are on the pump pressure/case drain filter modules.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 757 MAINTENANCE MANUAL
ENGINE START/ RAT CONTROL PANEL
SYSTEM LOW PRESSURE LIGHT (3 PLACES)
PUMP LOW PRESSURE LIGHT (6 PLACES)
w ON
a PRESS
a OVHT
w ON
a PRESS
a OVHT
Low Pressure Lights
Figure 1
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A
757
MAINTENANCE MANUAL
C. RAT Pressure Light (Fig. 1)
(1) A pressure indicating light for the RAT hydraulic pump is in the manual deployment switch on the engine start/RAT control panel. This light turns on when the RAT pump is suppling pressure. The pump pressure switch is on the RAT checkout module.
D. Pressure Transmitters (Fig. 2)
(1) A pressure line mounted transmitter in each system converts pressure to an electrical signal. The transmitters provide a voltage proportional to system pressure. The EICAS computer changes voltage signals from the transmitters into pressure readings on the EICAS display. The transmitters for the left and center systems are in the left wheel well. The right system transmitter is in the right wheel well.
3. Operation
_________
A. Functional Description (Fig. 3, 4, and 5)
(1)
Pressure Indicating
(a) A digital readout of pressure in each system is displayed in the status mode and the maintenance mode of EICAS. A pressure transmitter sends a voltage signal proportional to system pressure to the EICAS computer. The computer changes the voltage signal into a digital reading on the EICAS display. 中国航空网 www.aero.cn 航空翻译 www.aviation.cn 本文链接地址：757 AMM 飞机维护手册 液压 CHAPTER 29 - HYDRAULIC POWER 2(149)
