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linkages.
In the Mustang, a reservoir stores hydraulic
fluid for the pump and receives return flow
from the system (Figure 13-1). One electrically
driven pump supplies hydraulic power.
Hydraulic fluid is routed through lines, regulated
by system valves, and cleaned by filters.
The hydraulic system responds automatically
to the activation of controls for the landing
gear and brakes. The engine indicating and
crew alerting system (EICAS) indicates system
status. Also, landing gear and brakes each have
a pneumatic backup system to provide pressure
to their respective systems in the event of hydraulic
system failure (refer to Chapter 14—
“Landing Gear and Brakes”).
INTRODUCTION
This chapter provides information on the hydraulic system in the Citation Mustang aircraft.
Hydraulic fluid driven by a pump and regulated by valves provides pressure for
landing gear and brakes. Operation of these devices is presented in Chapter 14—“Landing
Gear and Brakes.” This chapter describes the portions of the hydraulic system used by
both subsystems.
CITATION MUSTANG OPERATING MANUAL
510OM-00 13-1
CHAPTER 13
HYDRAULIC POWER SYSTEMS
CITATION MUSTANG OPERATING MANUAL
13-2 510OM-00
BRAKE
SYSTEM
HYD
PUMP
CONTROL
MANIFOLD P
P
P
FILTER BYPASS
VALVE (100 PSID)
FILTER BYPASS
VALVE (100 PSID)
TO LANDING GEAR
BLOWDOWN SYSTEM
RESERVOIR
SIGHT GAUGES
RESERVOIR
DRAIN VALVE
RESERVOIR
RESTRICTOR
VALVE
FILTER
FILTER
PUMP
LH BUS
MANUAL
ACCUMULATOR
BLEED VALVE
OVERBOARD
VENT LINE
ACCUMULATOR
GEAR RETRACT
PRESSURE SWITCH
(1,275–1,475 PSIG)
LOW PRESSURE SWITCH
(750–950 PSIG) (ACTIVATES
CAS MESSAGE)
PRESSURE
RELIEF VALVE
(OPENS AT APPROX 1,750 PSIG)
NORMAL
PRESSURE SWITCH
(1,100–1,475 PSIG)
TO GEAR
EXTEND
TO GEAR
RETRACT
EMERGENCY
BLOWDOWN
BOTTLE
CABIN AIR
RESERVOIR
DRAIN
NITROGEN
LEGEND
SYSTEM PRESSURE
RETURN
CABIN AIR
HYD PRESS LO
HYD PUMP ON
Figure 13-1. Hydraulic System Schematic
CITATION MUSTANG OPERATING MANUAL
510OM-00 13-3
DESCRIPTION
The hydraulic system is classified as a “closed
center” system. When no subsystems are in use
(landing gear or brakes), there is normally no
flow in the system, except to maintain accumulator
charge.
The Mustang uses hydraulic power for retraction
and extension of the landing gear,
and operation of the brakes. The system includes
a single electrically driven hydraulic
pump, which functions to maintain and supplement
accumulator pressure.
The LANDING GEAR selector and gear-position
sensor switches determine which pressure
switch regulates pump operation and
resultant system pressure. When the combination
of LANDING GEAR selector, weight
on wheels, and gear position sensor switches
indicate the gear is ready for retraction or is
in transit, a gear-retraction pressure switch is
automatically selected to regulate the pump to
maintain approximately 1,300 psig minimum
system pressure. At all other times when the
hydraulic system is energized, a normal pressure
switch is automatically selected to regulate
pressure, maintaining 1,050 psig minimum.
(For details about the LANDING GEAR selector
and gear-position sensor switches, refer
to Chapter 14—“Landing Gear and Brakes”).
Both pressure switches limit maximum pressure
to approximately 1,550 psig. The system
relief valve provides additional protection if
system pressure exceeds 1,750 psig.
A hydraulic reservoir stores hydraulic fluid
for the pump and receives return flow from the
system. During system operation, an accumulator
stores hydraulic fluid under nitrogen
pressure to maintain system pressure.
Two filters clean the system: one in the pressure
flow upstream of the manifold and downstream
of the pump, and one in the return
flow, upstream of the reservoir.
The system uses red MIL-PRF-87257 hydraulic
fluid and is designed for operation in
ambient temperatures ranging from –65°F to
160°F (–54°C to 71°C).
COMPONENTS
The majority of the hydraulic system components
are in the lower left nose compartment
outside the pressure vessel.
RESERVOIR
The hydraulic reservoir is attached to the left
forward pressure bulkhead (Figures 13-2 and
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