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against the primary displays on the Sandel 3308 and VOR2 displays.
Eaglesoft Development Group: Citation II SP/2 C551 Operating Manual
9
Backup Instruments
Turn and Bank Indicator
The co-pilot’s backup Turn and Bank Indicator is powered by 28 VDC
from the RH Crossover Bus through a circuit breaker on the left hand
circuit breaker panel. On OFF flag will come into view any time power
is interrupted.
Backup Artificial Horizon
The backup artificial horizon is located on the co-pilot’s side of the
main panel, just above the Garmin 500 GPS display. It is driven by a
separate attitude gyro which is driven by bleed air from either engine.
The attitude gyro will be operating anytime at least one engine is running.
Due to the simplicity and reliability of the system, no warning
flags are provided. System pressure may be monitored through the
pressure indicator installed on the lower right side of the instrument
panel.
Eaglesoft Development Group: Citation II SP/2 C551 Operating Manual
10
Engine Operations Display
All of the engine instruments are mounted in the center of the main panel, just under the glareshield annunciator
panel. Although all of the instruments are driven from the 28 VDC bus, in the event of total electrical failure,
the N1 tape indicator will continue to indicate accurately above 50% RPM as enough electrical current is generated
by the tachometer generator to drive the tape servo. However, the N1 and N2 LED displays will extinguish.
The Fan (N1) tachometer is located at the 12 o’clock position on the engine case and is driven by the
inner shaft from the low speed turbines. The Turbine (N2) tachometer is attached to the accessory case and is
driven by the accessory case gear box. The Inter-turbine temperature (ITT) is a computed temperature determined
by multiplying the temperature rise of the air across the bypass duct by a factor of three and adding it to
the exhaust temperatures. This signal then goes to an amplifier and to a servo motor to position the tapes. The
tapes are calibrated from 100º C to 800º C with 700º C being the maximum allowable during any operation.
The fuel flow indicator receives its signal from the fuel flow transmitter down stream of the fuel control valves
and is calibrated from 100 to 2000 PSI.
1) N1 Dial - this is used simply to remind the pilot of the maximum N1 for takeoff and climbout operations.
2) N1 Engine Fan RPM: Redline at 104% RPM, normal range is 25% to 104% RPM
3) ITT: Redline at 700º C, Caution at 680º C to 700º C, normal range is 200º C to 680º C
4) Oil Temperature: Redline at 121º C, normal range is 0º C to 121º C
5) N2 Engine Turbine RPM: Red LEDs, flashing display and audible alert at 96% RPM
6) Fuel Quantity: self-explanatory, calibrated in LBS
7) Fuel Flow: self-explanatory, calibrated in LBS/Hour
8) Oil Pressure: Caution at 70 to 85 psi, normal range 35 to 70 psi, low caution at 35 psi
1
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4
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Eaglesoft Development Group: Citation II SP/2 C551 Operating Manual
11
Oxygen & Gyro Pressure Panel
Oxygen Pressure: Redline at 2000 psi, normal range
1600 to 1800 psi, low level 0 to 400 psi. Clicking the
‘hotspot #2’ will refill the oxygen system.
Gyro Pressure: normal range 2 to 3 psi
Hobbs: Two Hobbs engine time counters are provided, to
record actual engine running time. Click the ‘hotspot #1’
to reset the accumulated time to zero. These numbers are
stored to a file on the hard drive each time you unload
the model, or change aircraft. They are NOT affected by
the simulation rate, but measure “real time” instead.
Pressurization Panel
The pressurization system of the Citation II SP/2 is a model of simplicity, being mostly automatic in operation.
After entering the cockpit and switching on the electrical and avionics systems from the Engine/Electrical subpanel,
turn the Pressure Source Selector knob to the GND position to provide ventilation. After engine start,
switch the Pressure Source Selector knob to either LH, or RH engine, or NORMAL if both engines are started.
NOTE: Operation in BOTH HI mode is not approved for takeoff, landing or high power setting requirements!
If for any reason bleed air for the system is lost, switching the Pressure Source Selector to the EMER position
will switch the on the Oxygen supply. Pressure demand oxygen masks are stowed properly on the outboard
side of both pilot’s seats, and qualify as quick-donning oxygen masks. There is a one and a half hour supply of
oxygen on board, when the system is fully charged.
As part of your takeoff checklist, simply dial in the desired Cruise Altitude and the system will automatically
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Citation II SP/2 C551 Operating Manual(4)
