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If the PTU, is selected to AUTO and does not produce hydraulic pressure within 15 seconds, it will be latched OFF to min-imize the load placed on the right hydraulic system. The latch will only be reset if AUTO mode is de-selected by the cockpit crew or power is removed from the Proximity Sensor Electronics Unit (PSEU).
The PTU can also be manually selected ON by the cockpit crew. If only the right DCMP is operational, the landing gear may be extended using the main landing gear assist system rather than using the PTU in the left system.
HYDRAULIC SERVICING DESCRIPTION
The left and right hydraulic systems each have ground service quick-disconnects for ground fill, pressure and return fluid circuits. These are used for ground maintenance tasks such as system bleeding, flushing, draining and ground pressuriza-tion. The auxiliary system filler has a quick-disconnect to add hydraulic fluid to the auxiliary reservoir. The quick disconnects are installed on panels near the system access doors.
Volume 2 Flight Crew Operating Manual May 06/2005 CSP 100-6 REV 2
13-01-08 HYDRAULIC SERVICING (Cont) HYDRAULIC SERVICING PANEL
A
B
LEFT SYSTEM
PRESSURE
RIGHT SYSTEM A
PRESSURE
LEFT SYSTEM RETURN
RIGHT SYSTEM
HYDRAULIC SERVICING PANEL RETURN
B
CFO1301002_007
May 06/2005 Flight Crew Operating Manual Volume 2 REV 2 CSP 100-6
13-01-09
HYDRAULIC SERVICING (Cont) AUXILIARY ACCUMULATOR SERVICING
C
D
C
AUXILLARY ACCUMULATOR SERVICING
D
CFO1301002_008
Volume 2 Flight Crew Operating Manual May 06/2005 CSP 100-6 REV 2
13-01-10
TEMPERATURETRANSDUCER
LEGEND
SUPPLY PRESSURE (P)SUCTION PRESSURE (S)
RETURN PRESSURE (R)
ECOLOGY
CFO1301002_014
CONTROLS AND INDICATIONS
DESCRIPTION
The hydraulic control panel is located immediately to the right of the throttle quadrant on the center pedestal. From the hydraulic control panel the electric hydraulic pumps, shutoff and selector valves, and power transfer unit can be manually operated. The Engine Indicating and Crew Alerting System (EICAS) monitors and displays the hydraulic system informa-tion.
HYDRAULIC CONTROL PANEL
CFO1301002_006
Volume 2 Flight Crew Operating Manual May 06/2005 CSP 100-6 REV 2
13-01-12
HYDRAULICS
CONTROLS AND INDICATIONS (Cont) HYDRAULIC SYNOPTIC PAGE
The hydraulic system operation is monitored and status displayed on the hydraulic synoptic page.
May 06/2005 Flight Crew Operating Manual Volume 2 REV 2 CSP 100-6
13-01-13 EICAS MESSAGES
The hydraulic system messages are shown on the EICAS. In the table below, the hydraulic system messages and inhibits are listed. A brief explanation of each message is provided.
MESSAGE INHIBITS MEANING AURAL WARNING
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