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which provides a signal to CAS. The following CAS illumination is specific
to the brake accumulator:
HYDRAULIC GROUND SERVICE
The hydraulic system is serviced through a ground service access located
below the right engine pylon. A ground service panel within this access
monitors hydraulic system condition for the auxiliary dc motor
brushes, main/auxiliary system filters, status of the ground service
valve, and main/auxiliary reservoir fluid levels. If the BRUSH indicator
illuminates, the dc motor brushes are 90% worn (refer to Chapter 29
in the maintenance manual for corrective actions). A ground service
switch allows system pressurization by either main or auxiliary
pumps. The ground service access also includes quick-disconnect ports
for pressure, return and fill lines, and an air bleed valve for the
reservoir.
The following CAS illuminations are specific to the hydraulic system:
CAS Color Description
BRK ACUM PRESS Amber Emergency brake accumulator pressure is
not within the acceptable range (either too
high or too low).
CAS Color Description
AUX HYD QTY LO Amber Auxiliary hydraulic reservoir quantity is low.
Auxiliary hydraulic pressure is not available to
operate the landing gear and flaps. Auxiliary
hydraulic pressure is still available to the
brakes and brake accumulator.
MAIN HYDQTY LO White - The fluid level in the hydraulic reservoir
(main system) is either low or overfull.
or
- One or more of the hydraulic system (main
or auxiliary) filters is becoming clogged.
Pilot’s Manual
PM-126A 3-5
HYDRAULIC SYSTEM PAGE
The HYD system page can be selected for display from the System Page
Menu. This page includes a system schematic that presents both a
graphic and a digital display of system pressures, quantities and faults.
These indications include a digital readout of main hydraulic system
pressure, a digital and analog indication of brake accumulator pressure,
and a LOW indication for the auxiliary reservoir fluid level. These
indications will change color when operating limits are exceeded.
A circled L, R, and A on the HYD page schematic represent the three
hydraulic pumps. These pump symbols will turn amber if the corresponding
pump output pressure switch in the hydraulic manifold does
not detect normal output pressure.
HYD SYSTEM PAGE
Figure 3-1
L R
MAI N
RESERVOIR
AUX PUMP
BRAKE
ACCUM
3000
PSI
ENGINE
PS I
PUMPS
A
300 0
Pilot’s Manual
3-6 PM-126A
INTENTIONALLY LEFT BLANK
Pilot’s Manual
PM-126A 3-7
HYDRAULIC SYSTEM SCHEMATIC
Figure 3-2
THRUST
REVERSER
SYSTEM
FLAP
SYSTEM
LANDING
GEAR
SYSTEM
BRAKE CONT/
ANTI-SKID
SYSTEM
[CLOSED]
FIRE
PUSH
R
ENGINE
FIRE
[CLOSED]
FIRE
PUSH
L
ENGINE
FIRE
REGULATOR
PRESSURE
V
P
ON
AUX HYD
RESERVOIR
RESERVOIR
FLUID
LEVEL
SENSORS
RESERVOIR
SERVICE
PRESSURE
RELEASE
VACUUM
RELIEF
VALVE
PRESSURE
RELIEF
VALVE
VENT
26
AUXILIARY
RESERVOIR
DRAIN
GROUND
SERVICE
SUPPLY
GROUND
SERVICE
PRESSURE
RESERVOIR
FILL
MAIN
SYSTEM
ACCUMULATOR
MAIN
PRESSURE
TRANSDUCER
7
8
4
AUXILIARY HYDRAULIC SYSTEM
ON
HYD XFLOW
THERMAL
SHUTOFF
VALVE
BLEED
AIR
AUXILIARY
OVERFULL
FULL
SERVICE
AUX LOW
3000
3
REGULATOR
PRESSURE PRESSURE
REGULATOR
P PRESSURE RELIEF
VALVE
AUXILIARY PUMP
V VACUUM RELIEF
VALVE
DRAIN VALVE
FILTER
6
SPOILER/
SPOILERON
SYSTEM
RETURN
SUPPLY
SOURCE SELECTOR
VALVE
AIR
ELECTRICAL
PRESSURE
SWITCH
SHUTOFF VALVE
PRESSURE
PRESSURE
TRANSDUCER
1. AUX HYD PMP LO (amber)
2. AUX HYD QTY LO (amber)
7. L HYD PUMP LOW (white)
8. R HYD PUMP LOW (white)
4. MAIN HYD PRESS (amber)
5. HYD XFLOW ON (white)
3. BRK ACUM PRESS (amber)
6. MAIN HYDQTY LO (white)
CAS MESSAGES
FLUID LEVEL
SENSOR
16
FILTER
MANUAL RELIEF
VALVE
CHARGE
VALVE
QUICK
DISCONNECT
ACCUMULATOR
ENGINE DRIVEN
PUMP
CHECK VALVES
MAIN
BRAKE
ACCUMULATOR
5
3-7 / 3-8 (Blank)
　
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