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Airspeed
The airspeed indicators are identical and operate off uncorrected pitot- static input.
The instruments incorporate a single rotating needle, a fixed scale calibrated in
knots and a rotating mach scale. Slots in the airspeed dial at 262 and 277 KIAS
will show red below 14,000 feet and from 14,000-28,000 feet respectively, indicating
Vmo limits. The mach limit of .705 above 28,000 feet is indicated by a single
red line. A knob on the lower right corner controls a moveable index that can be
set for reference.
1) Heading Bug Adjust 3) Vmo Limit Line(s)
2) Mach Index Adjust 4) Heading Bug
Vertical Speed Indicators
The two instantaneous vertical speed indicators indicate vertical velocity from 0 to
6,000 feet per minute, either up or down. Their operations differs from conventional
VSI’s in that there is nearly zero time lag between aircraft displacement and
instrument indication. Accelerometers sense any change in normal acceleration and
displace the needle before an actual pressure change occurs.
Eaglesoft Development Group: Citation II SP/2 C551 Operating Manual
7
Attitude Director Indicator
The ADI displays aircraft attitude, computed roll and pitch steering
commands and ILS raw data through the expanded localizer
needle. Pitch attitude is marked in five degree increments to 20º
of pitch, with additional marks at 30º, 40º and 90º. A fixed reference
airplane displays actual aircraft position relative to the pitch
and roll attitudes of the ADI sphere. Also incorporated is an inclinometer
indicating skid or slip conditions (1).
The flight director command bars are visible at all times, but are
not active until the flight director system is in operation. They
are positioned by the FD computer to display pitch and roll steering
commands for the mode selected on the AP mode control
panel. Positioning the fixed reference aircraft to align it with the
command bars will give computed steering to intercept and track
a radial, glideslope, or whatever mode may be selected.
1) Inclinometer
2) Decision Height Indicator - This illuminates whenever the selected Decision Height is acquired.
3) Flight Director Command Bars
4) Localizer Needle
Electronic Horizontal Situation Indicator
The EHSI is a representation of the Sandel 3308 instrument.
This is a very complex instrument and will be covered in detail
in its own chapter of this Operations Handbook.
The Horizontal Situation Display shows heading and navigation
information in a 360º view similar to a conventional mechanical
HSI, or in an EFIS 120º ARC view. This includes compass card,
heading bug, course pointer, course deviation bar, TO/FROM
indicator, glideslope indicator and flags. Heading bug and
course pointer settings include digital, color coded readouts that
make it easy to set precise headings and courses. One button
operation allows primary navigation to be switched quickly between
NAV1 and GPS sources, as well as the display of NAV2
and ADF receiver data. The entire display is color coded to
clearly indicate which navigation source is selected: green for
NAV2, yellow for NAV2, and cyan for GPS.
Since the 3308 is capable of displaying a huge amount of information simultaneously, there is a “de-clutter”
function that will allow you to display as much, or as little information as you desire with the touch of a single
button. You decide how much information to display, and when to display it.
Eaglesoft Development Group: Citation II SP/2 C551 Operating Manual
8
Bendix/King VOR2 Display
There are two standard Bendix/King VOR Displays installed on the aircraft,
which are driven by the NAV2 radio. They feature localizer and
glideslope deviation needles, TO/FROM, ILS and GS Inop flags. An OBS
(Omni Bearing Selector) knob is used to determine the desired heading
when tracking a radial from a VOR either inbound or outbound.
Radar Altimeter
A Radar Altimeter is installed on the pilot’s side of the panel only. The
Decision Height may be selected either with the knob on the instrument
display, or by the remote panel just above the radio stack. When the selected
DH is reached, a light on the Radar Altimeter will illuminate, and
the signal is repeated electrically to the display on the ADI.
RMI
A dual needle RMI is installed on the pilot’s side of the main panel. The
two needles are color coded: green for the ADF direction and yellow for the
VOR2 bearing. They are driven by the ADF receiver mounted just above
the main radio panel, and to the right of the Altitude/VS/DH remote selector
unit. These are used mainly for backup instrumentation and cross-checking
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Citation II SP/2 C551 Operating Manual(3)
