AREA NAVIGATION
UNIVERSAL UNS-1Esp FLIGHT MANAGEMENT SYSTEM
The Universal UNS-1Esp is a fully integrated navigation management system designed to provide
the pilot with centralized control for the airplanes navigation sensors, computer based flight planning,
and fuel management. The FMS accepts primary position information from short and long-range
navigation sensors. The primary position data received from the sensors is filtered within the FMS to
derive “Best Computed Position” (BCP). It accomplishes these computations and advises the flight
crew of components or systems requiring attention, as well as other irregularities, such as loss of
enough sensors to compute a valid position. In the latter situation, if sensor loss endures over a set
length of time, the system will enter Dead Reckoning (DR) mode and so inform the pilot through a
message on the control display unit (CDU).
The UNS-1Esp provides lateral steering information to the pilot through the flight director and
primary flight display (PFD). When connected to the autopilot, it provides roll steering commands.
The VNAV function provides vertical steering information via the vertical deviation needle. VNAV
guidance is not provided to the flight director or autopilot when in the APR button on the MS-560 is
pushed, but the UNS FMS does provide the VNAV submode VAPP. The NAV computer additionally
computes fuel flow information, providing a current fuel status and airplane gross weight throughout
the flight if the fuel and gross weight are updated prior to takeoff.
In the dual installation of the Universal UNS-1Esp, the system may be configured as independent or
with crossfill capability.
The system provides best computed position from the scanning DME, VOR, and long range
navigation sensors. This position is used for navigating the airplane along the programmed flight
plan and during approved instrument approach procedures.
The UNS-1Esp provides advisory VNAV information for up to nine waypoints on the flight plan.
Vertical guidance is displayed on the EFIS.
NOTE
Selecting HSI or SG reversion returns the navigation display to basic NAV mode.
FMS may be reselected.
The UNS-1Esp database incorporates SIDs, STARs, and approaches including GPS approaches.
These procedures may be flown coupled to the autopilot or flight director.
NOTE
• The MFD map display may be incorrect for the procedures described above. The
pilot should refer to the appropriate published SID, STAR or approach procedure
for correct navigational guidance. For SIDs and STARs containing floating
waypoints (heading to altitude and/or course to intercept), the CDI needle will be
set to the correct sensing for the first active non floating waypoint on that
procedure. This waypoint will always be annunciated on the HSI and appear as
the magenta colored waypoint on the MFD map. If LNAV is selected as the lateral
mode, the flight director will command headings and course to intercept per the
published procedure but these will not appear on the MFD or HSI map, nor will the
CDI give any guidance to these floating waypoints.
Cessna Citation XLS - Instrumentation & Avionics
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