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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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Avionics

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