TRUE AIRSPEED PROBE
A true airspeed probe is located below the windshield on the fuselage right side. This temperature
reading is fed directly into the Air Data Computers for computation purposes only and does not
provide a viewable readout.
STANDBY HORIZONTAL SITUATION INDICATOR (HSI)
The HSI-315B standby horizontal situation indicator is a three inch instrument located on the left side
of the center instrument panel. It provides short range navigational guidance in case of PFD/flight
director failure, or in case of primary electrical system failure. The HSI is “hard-wired” to the NAV 1
receiver and is powered by the emergency DC bus.
The standby HSI displays compass heading, glideslope and localizer deviation and airplane position
relative to VOR radials. The compass card is graduated in 5° increments and a lubber line is fixed at
the fore and aft positions. Azimuth markings are fixed at 45°, 135°, 225°, 270°, and 315° on the
compass face. A fixed reference airplane is in the center of the HSI, aligned longitudinally with the
lubber line markings.
The course cursor is set by a knob on the instrument. Once set, the cursor rotates in its set position
with the compass card. The course deviation bar, which forms the inner segment of the course
cursor, rotates with the course cursor.
A blue ADF needle, which displays ADF 1 bearings, rotates around the outer portion of the dial.
A heading (HDG) flag will appear in the instrument when the compass system is OFF, the heading
signal from the AHRS 2 becomes invalid, primary power to the indicator is lost, or the error between
the displayed heading and the received signal becomes excessive.
STANDBY (HSI)
Figure 3-5
Cessna Citation XLS - Instrumentation & Avionics
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