FlightSafety LEARJET 45 Pilot Training Manual page 304

Table 13-1. HYDRAULIC SYSTEM CAS MESSAGE DATABASE
Type
CAS Message
Msg
AUX HYD PMP LO
C
C AUX HYD QTY LO
C BRK ACUM PRESS
C MAIN HYD PRESS
A
MAIN HYDQTY LO
A
L R HYD PUMP LOW
HYD XFLOW ON
A
C = Caution
A = Advisory
75.0
L R HYD PUMP LOW
550
50.0
80
60
1002
LBS PITCH TRIM
R 1750
Figure 13-5. Hydraulic System CAS
Messages on EICAS
13-8
L E A R J E T 4 5 P I L O T T R A I N I N G M A N U A L
Aux hyd pump ON w/press < 1,900 psi.
Low aux hyd reservoir qty, inhibits HYD XFLOW.
EMER brk acum pressure < 1,200 or > 3,600 psi.
Main hydraulic pressure < 1,500 or > 3,600 psi.
Main hydraulic fluid quantity low.
L or R engine hydraulic pressure < 1,900 psi.
Hydraulic Crossflow is open.
AUX HYD PMP LO
AUX HYD QTY LO
BRK ACUM PRESS
MAIN HYD PRESS
MAIN HYDQTY LO
HYD XFLOW ON
END
SAT °C
-15
6.5
FLAPS 20
FOR TRAINING PURPOSES ONLY
Logic Summary
sure or auxiliary system pressure, provides hy-
draulic fluid to the landing gear and the flaps.
The crossflow valve is solenoid actuated, and
is normally deactivated, allowing main hy-
draulic system fluid to the gear and flaps.
Should main hydraulic system pressure be
lost, the pilot can open the hydraulic crossflow
valve by depressing the HYD XFLOW switch
located on the gear/hydraulic control panel
(Figure 13-2). When the valve is activated,
"ON" is annunciated within the switch. After
opening the crossflow valve, selecting the
AUX HYD pump switch "ON" allows auxil-
iary hydraulic system pressure to be supplied
to the landing gear, gear doors and flaps
(Figure 13-3).
Should the quantity level within the auxiliary
reservoir deplete to a LOW level, the hydraulic
crossflow valve is automatically closed, al-
lowing conservation of auxiliary fluid for the
airplane brake system. A CAS caution mes-
sage, "AUX HYD QTY LO" alerts the crew to
this condition.
The hydraulic crossflow valve is 28 VDC pow-
ered from the left essential bus. It is protected
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