OPERATIONS MANUAL

Hydraulics
EICAS Messages:
CAUTION MESSAGES (accompanied by caution light and beeper sound)
HYD PRESS SYS ()
SYS
FAULT
LIGHT
output pressure of hydraulic system (1, 2, 3, or 4) is
below 1200 psi
[message inhibited by ENG () SHUTDOWN]
HYD CONTROL ()
HYD OVHT SYS ()
HYD PRESS DEM ()
HYD PRESS ENG ()
>HYD QTY LOW ()
HYD OVHT SYS ()
HYD PRESS DEM ()
HYD PRESS ENG ()
HYD RSVR PRESS ()
HYDIM ()
SYS
FAULT
LIGHT
PRESS
LIGHT
PRESS
LIGHT
SYS
FAULT
LIGHT
SYS
FAULT
LIGHT
PRESS
LIGHT
PRESS
LIGHT
ADVISORY MESSAGES
HYDIM (1 or 4) fails to provide automatic demand
pump control and system data for indications
case drain temperature of any pump in hydraulic
system (1, 2, 3, or 4) is above 105°C
in hydraulic system (1, 2, 3, or 4)
the demand pump selector is set to OFF
OR demand pump is not powered
OR { demand pump is commanded to run
AND pump output pressure is below 1400 psi }
OR { auxiliary pump is commanded to run
AND pump output pressure is below 1400 psi }
[message inhibited by HYD PRESS SYS ()]
EDP (1, 2, 3, or 4) output pressure is below 1400 psi
AND engine is not shut down
[message inhibited by HYD PRESS SYS ()]
fluid quantity of hydraulic system (1, 2, 3, or 4) is at
or below 0.34
STATUS MESSAGES
case drain temperature of any pump in hydraulic
system (1, 2, 3, or 4) is above 105°C
in hydraulic system (1, 2, 3, or 4)
the demand pump is commanded to run
AND pump output pressure is below 1400 psi
AND demand pump is powered
AND associated engine is not shut down
EDP (1, 2, 3, or 4) output pressure is below 1400 psi
AND engine is not shut down
reservoir bleed air pressure of system (1, 2, 3, or 4) is
at or below 21 psi
HYDIM (1, 2, 3, or 4) data bus has failed
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