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13-3) and stores hydraulic fluid for the pump
and receives return flow from the system. When
fluid flows, the excess hydraulic fluid returns
to the reservoir. Cabin air pressurizes the reservoir
to reduce foaming and assure positive flow
to the pump. A relief valve opens at approximately
10 psi to prevent overpressurization.
There are two sight gauges on the hydraulic
reservoir that are visible through the forward
baggage compartment liner. The reservoir capacity
is approximately 2.2 quarts (2 liters) as
indicated by the full mark.
PUMP
The hydraulic pump is powered by normal DC
power through the HYD PUMP circuit breaker.
The pump operates whenever the pressure drops
below the lower set point of the normal gear retract
pressure switch. Pump operation discontinues
once pressure is restored to the upper set
point of the regulating pressure switch.
HYDRAULIC ACCUMULATOR
The hydraulic accumulator receives fluid from
the pump and stores a supply of hydraulic fluid
under pressure. During pump inactivity this
pressurized fluid maintains pressure against
normal internal leakage within the system. It is
also used to supplement pump flow during landing
gear extension and retraction.
PRESSURE SWITCHES
There are a total of three pressure switches in
the control manifold. Two of these switches
control pressure to the overall system and gear
retraction cycle; the third pressure switch provides
a warning for low system pressure. The
switches are identified as NORMAL, GEAR
RETRACTION and LOW PRESSURE. The
NORMAL pressure switch maintains a constant
pressure on the system under no load. The
GEAR RETRACTION pressure switch provides
increased system pressure for the gear
retraction cycle. The LOW PRESSURE switch
alerts the crew to an overall low system pressure
through an amber HYD PRESS LO message
in the CAS window.
NORMAL Pressure Switch
Whenever the GEAR RETRACTION pressure
switch is not active, the NORMAL pressure
switch regulates pump operation. It closes to
energize the pump whenever system pressure
falls below approximately 1,050 psig and opens
to deenergize the pump when system pressure
rises above approximately 1,550 psig.
CITATION MUSTANG OPERATING MANUAL
13-4 510OM-00
Figure 13-3. Hydraulic Reservoir Sight
Gauge
Figure 13-2. Hydraulic Reservoir and Location
CITATION MUSTANG OPERATING MANUAL
510OM-00 13-5
GEAR RETRACTION Pressure
Switch
When the LANDING GEAR selector is selected
UP and the landing gear is not fully retracted
(as indicated by uplock sensor
switches) or when the LANDING GEAR selector
is selected GEAR DOWN and the aircraft
is airborne (as indicated by the squat
switches), the GEAR RETRACTION pressure
switch regulates pump operation. It closes
to energize the pump whenever system pressure
falls below approximately 1,300 psig and
opens to deenergize the pump when system
pressure rises above approximately 1,550 psig.
LOW PRESSURE Switch
The LOW PRESSURE switch (750 psig–1,000
psig) signals the HYD PRESS LO message in
the CAS window to display. This message advises
the crew that the hydraulic pressure is low
and that the hydraulic pump failed to operate
automatically when signaled by the NORMAL
or GEAR RETRACTION pressure switches.
SYSTEM RELIEF VALVE
A mechanical relief valve in parallel with the
landing gear and brakes maintains the system
pressure at a maximum of 1,750 psig.
FILTERS
The system incorporates two filters: one for
filtering fluid leaving the pump and one for filtering
return fluid prior to entering the reservoir.
Each filter incorporates a bypass valve
that opens at 100 ± 10 psid if the filter element
clogs. As a bypassed filter is a standard maintenance
interval item, there is no cockpit indication
or filter indication of bypassing.
CONTROLS AND
INDICATIONS
The hydraulic system functions automatically
during normal DC power (supplied by
generator, battery, or ground power unit).
All inflight indications for the hydraulic system
appear as crew alerting system (CAS) messages
on the EICAS as displayed on the
multifunction display (MFD) or (in reversionary
mode) on the primary flight displays (PFDs).
HYD PRESS LO MESSAGE
The low pressure switch in the hydraulic control
manifold controls the amber HYD PRESS
LO message. As hydraulic system pressure
decreases below 750 psig, the HYD PRESS LO
message appears, accompanied by MASTER
CAUTION lights. As the pump increases system
　
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