MD-11 Flight Crew Operations Manual
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Hydraulics Chapter Hyd
Alerts Section 40
Hyd.40.1
Hyd.40 Hydraulics-Alerts
NOTE: The associated cue switch is shown in parenthesis (XXX)
following the alert.
Red Boxed Alerts (Level 3)
HYD 1 & 2/1 & 3/2 & 3 FAIL (HYD) - Fluid quantity in respective systems
(1 and 2/1 and 3/2 and 3) is less than 1 gallon or the system press and all
pump press (L, R & RMP) are low and slats/flaps extended.
Amber Boxed Alerts (Level 2)
HSC AUTO FAIL (HYD) - HSC cannot control the hydraulic system in auto
mode and has not reverted to manual.
HYD 1/2/3 FAIL (HYD) - Fluid quantity in respective system is less than 1
gallon or the system press and all pump press (L, R & RMP) are low and
slats/flaps extended.
HYD 1/2/3 PRES HI (HYD) - Respective system pressure is more than 3500
psi.
HYD 1/2/3 PRES LO (HYD) - Respective system pressure is less than 2400
psi. Manual mode.
HYD 1/2/3 QTY LO (HYD) - Respective system fluid less than 2.5 gallons
(manual mode only).
HYD 1/2/3 TEMP HI (HYD) - Respective system has exceeded 100 degrees
C (manual mode).
HYD ALERTS (HYD) - Data interface between the HSC and the DEUs is not
valid. Hydraulic alerts, synoptic and master warning are affected,
however, quantity, pressure, and temperature alerting should be valid.
Amber Alerts (Level 1)
HYD 1/2 OFF (HYD) - Respective system engine driven pumps 1/2 and the
respective reversible motor pumps 1-3/2-3 are off.
HYD 1/2/3 PRES LO (HYD) - Respective system pressure is less than 2400
psi. Auto mode.
HYD 1/2/3 QTY LO (HYD) - Respective hydraulic system fluid quantity is
low. This alert is displayed if there is less than 4.75 gallons (system 1 and
2) or 6 gallons (system 3) on the ground prior to engine start, or less than
2.5 gallons after engine start.
October 02, 2006
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