MD-11 Flight Crew Operations Manual
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Hydraulics -
Alerts
Hyd.40.2
HYD 1/2/3 TEMP HI (HYD) - The temperature in the respective hydraulic
system reservoir has exceeded 100 degrees C (212 degrees F).
HYD 1-3/2-3 RMP DISAG (HYD) - 1-3/2-3 reversible motor pump not in
commanded position.
HYD 3 ELEV OFF (HYD) - The elevator shutoff valve in hydraulic system
3 is closed. Hydraulic system 3 is not powering the elevators.
HYD 3 OFF (HYD) - System 3 engine driven pumps, both reversible motor
pumps, and both auxiliary (electric) pumps are off.
HYD LRU INOP (MAINT) - Maintenance has taken action to declare a
hydraulic system component inoperative. The auto controller will
reconfigure around the inoperative component in the auto mode.
HYD PRES TST FAIL (HYD) - The flight crew initiated hydraulic pressure
test has failed. A second test may be performed. If alert is displayed
again, call maintenance.
HYD PUMP 1L/1R/2L/2R/3L/3R <2800 (HYD) - Respective pump pressure
is less than 2800 psi during engine pump preflight test. This test is
accomplished by the HSC during each engine start. This alert will be
displayed in conjunction with a HYD PUMP TST FAIL alert.
HYD PUMP 1L/1R/2L/2R/3L/3R FAULT (HYD) - The respective
engine-driven hydraulic pump pressure or temperature is out of limits.
The HSC will turn off the affected pump when the aircraft is in cruise.
HYD PUMP 1L/1R/2L/2R/3L/3R OFF (HYD) - The respective
engine-driven hydraulic pump is off.
HYD PUMP TST FAIL (HYD) - The engine-driven hydraulic pump preflight
pressure test has failed.
HYD SYS 3 ISOL (HYD) - The flight control bypass valve is closed.
Hydraulic system 3 pressure is not available to the flight controls.
HYD SYS MANUAL (HYD) - The HSC is in the manual mode.
RUD STBY LWR OFF (HYD) - The 3-2 non-reversible motor pump is
inoperative. Standby hydraulic power to the lower rudder is not
available.
RUD STBY UPR OFF (HYD) - The 2-1 non-reversible motor pump is
inoperative. Standby hydraulic power to the upper rudder and stabilizer
trim motor is not available.
RUDDER BOTH INOP (HYD) - No primary or non-reversible motor pump
power to the upper or lower rudder actuator.
October 02, 2006
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