VHF NAVIGATION
The RNZ-850 integrated navigation unit operates in the frequency range of 108.00 to 117.95 MHz.
The RNZ-8501 system encompasses the functions of VHF NAV, localizer and glideslope receiver,
marker beacon receiver, and the additional functions of ADF and DME, which in conventional
systems, are separate units. Operation of the marker beacon system is discussed under "Marker
Beacon".
Glideslope paired frequencies are tuned with the published ILS frequencies as in standard VHF NAV
practice. The RNZ-851 is the navigation component of the SRZ-85X integrated radio system. The
two NAV integrated receivers are controlled and tuned in a similar manner to the RCZ-833 COM
units discussed under VHF COMM, above.
The NAV frequency window on the main tuning (first) page has an additional function called the
"DME Split Tuning Mode". This function involves "DME hold" plus some additional features, and is
discussed under Distance Measuring Equipment in the Pulse Equipment part of this section.
NAV 1 can be tuned by the standby radio control unit (SRC) as well as by the RM-855. Tuning by
means of the SRC is discussed under Standby Radio Control Unit, above.
Both NAV 1 and NAV 2 are selectable on the pilot’s and copilot’s DC-550 display controller to be
displayed on either HSI (within the PFD). NAV 1 is displayed by the BRG "O" knob and NAV 2 is
displayed by the BRG "
" knob. Either NAV 1 or NAV 2 may be selected by the NAV pushbutton to
provide guidance to the flight director system. The NAV 1 or NAV 2 selection switches with each
press of the button. If NAV 1 or NAV 2 is selected on both sides (by pilot and copilot) the
annunciation in the HSI will be in yellow instead of green.
Operation of the NAV displays on the standby horizontal situation indicator (HSI) and the electronic
horizontal situation indicators (EHSI) is discussed under Standby Horizontal Situation Indicator and
Electronic Horizontal Situation Indicators, in this section.
AUTOMATIC DIRECTION FINDER
The automatic direction finder (ADF) function of the Primus II integrated radio system is provided by
the DF-850 ADF receiver module which is a component of the RNZ-850 integrated navigation unit.
As discussed in the COM section above, the tuning of the complete system, which includes the ADF,
is accomplished by means of the radio management unit (RMU), the RM-855.
The receiver has a frequency range of 100.00 to 1799.5 KHz in 0.5 KHz increments. A strap
selectable option is available which allows tuning of marine emergency frequency of 2181 thru 2183
KHz.
Cessna Citation XLS - Instrumentation & Avionics
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