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AST 473 Cessna Citation II
Basic Avionics and Flight
Instrumentation (UNs 210
626)
Dr. Barnhart
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Avionics & Flight Instrumentation
Important note: Avionics vary widely
according to specific aircraft. Spend time
learning your aircraft
FSIs sim. Is the old steam gauge II
(models a S/N 0210 0626)
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Avionics
Pilots Flight Instruments:
ADI (5 inch, Dual-cue flight director, 12
annunciators for flt. Director modes)- displays
AOB, G/S, T&B, Loc, Radio alt)
HSI
RMI (w/ ADF)
Altimeter- driven by Air Data Computer (ADC)
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Avionics
Co-Pilots instruments:
Basic 6-pack layout w. HSI
RMI (with ADF)
(altimeter is conventional barometric)
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Avionics
Flight Guidance- SPZ-500 autopilot/FD-complete flight control system:
Flight Director
Autopilot Pilots ADI/HSI
Air Data Computer
Autopilot controller Vert. Nav. System- alt. alerter, Touch Cntl
Steering (TCS), rate gyro, autopilot servos
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Avionics
Flt. Guidance System- operates via the
pilots ADI/HSI
ADC provides P.A. input, alt. reporting, alt.
pre-select, IAS hold and vert. speed mode
Can be flown manually or automatically
Meets CAT II requirements
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Avionics
Mode Control Panel-
Push on/off backlighted switches
Displays selected flight director mode- amber
when armed or green when captured
FD OFF- puts command bars down out of
view- doesn't affect autopilot
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Avionics
Autopilot Control Panel- provides means
of engaging autopilot and yaw damper (as
well as manually controlling autopilot via
turn knob and pitch wheel)
Two torque modes (high and low speed- baro.
set to 14,500 ft. in co-pilots static system)
Autopilot switch engages autopilot and YawDamper (aid to pax. Comfort)
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Avionics
Autopilot ctn.
SOFT RIDE switch- maintains stability inrough air- minimizes autopilot gains.
TEST EACH FLT- activates a test of thecurrent monitor for A/P Pressing causes A/P to disengage- simulates
failure of torque limiters- must disengage w/I 2 sec.
AUTOPILOT OFF illuminates and warning sounds TRIM light illuminates UP/DOWN when sustained
signal applied to elevator servo- trim out servopressure prior to disengaging A/P if TRIM lt. illum.
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Avionics
Touch Control Steering (TCS)- pilots cntl.
wheel- allows manual mvmt. of A/C during
autopilot ops. w/o cancellation of any
selected mode.- Interrupts A/P ops.-releasing button re-engages autopilot
When using F/D & flying manually- TCS
matches command bars to existing pitchattitude or V/S mode can be reset w/ TCS
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Avionics
VNAV Computer/Controller- provides data inputs
for alt. pre-select mode (ALTSEL), alt. alert, or
vert. nav. Mode (VNAV).- data input w/ data sel.
Switch and then setting w/ SET knob. VNAV ops. Only when using NAV 1 w/ DME set
to NAV 1 and locked on VORTAC
VNAV fcn. Only valid when going directly to or
directly from a VOR/DME station
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Avionics
C-14 Compass System- pilots HSI andflight director and co-pilots RMI driven bythe slaved gyro system. Components:
DG Flux Detector
2 mode selector switches
Remote compensator
Slaving indicator on HSI
2 LH GYRO SLAVE switches- on left panel
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Avionics
Ctn.
1 w/ AUTO and MAN
Other w/ LH/RH position
Allow selection of auto (slaved) or manual
(unslaved). In AUTO (for normal ops.)-
compasses align @ 3 5 deg./sec. IN MAN.-
HSI on co-pilots RMI card can be moves L orR @ 30 deg./min. by toggling the LH-RH sw.
(slaving indicator on HSI goes away).
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Avionics
Ctn.
Co-pilots compass system- identical to pilots
but drives co-pilots HSI and pilots RMI card
If DC fail- place BATT sw. in EMER. Restores
pwr. To co-pilots HSI
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Avionics
Radio Altimeter- Optional- provides
absolute altitude readout from 2,500 AGL
to gnd. In 10 ft. incr. (5 ft. below 200 AGL)
Aux. output can be used to drive a rising
runway bar on pilots ADI
A DH window is included on ADI to set DH
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Avionics
AOA system (optional)- Transmitter (conical
sensor), flap position sensor, and indicator.
Indicator- computes AOA from transmitter and Flap
sensor to provide readout. Calibrated from 0 1.0 At 0 no lift produced
Red arc- beginning of low speed buffet to stall
Yellow- approaching critical AOA
Indices at .8 (low speed buffet), .6- [optimum app.speed- 1.3 V(SO) and V(X), and max. endurance],
and .35 (max. range)
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Avionics
2 IVSI- show vert. velocity from 0 6,000
ft.- springs and accelerometers used to
reduce normal VSI lag.
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Static Ports-
2 per side- fwd. of cockpit windows
Dual pickups used to reduce sideslip effects
Co-pilots altimeter- barometric.
Due to low vibration in turbojets this instr. Has an
elec. Motor w/ an eccentric shaft attached to a
baro. Altimeter to ensure its accuracy- constantly
vibrates it
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THE END