Model 560XL Section III – Operating Procedures
Abnormal Procedures
Textron Aviation Citation 560XL 190-02313-03 Rev. 8
3-44 FAA Approved
DUAL GPS/SBAS FAILURE
DR or GPS LOI Displayed on HSI
NO FMS POSITION MAY BE DISPLAYED ON NAVIGATION MAP
IF ALTERNATE NAVIGATION SOURCES (ILS, LOC, VOR, DME, ADF) ARE AVAILABLE:
1. Navigation – USE ALTERNATE SOURCES.
Procedure completed
IF NO ALTERNATE NAVIGATION SOURCES ARE AVAILABLE:
IF DR IS DISPLAYED ON HSI:
The system is in Dead Reckoning Mode. Estimated position is greater than 30 NM from both the
destination and departure airport.
1. Navigation – Use the airplane symbol, magenta course line on the map display, and
the amber CDI for course information. Fly toward known visual conditions. Use
ATC or other information sources as available.
NOTE
All information normally derived from GPS turns amber. All of this
information will become less accurate over time.
DR mode uses heading, true airspeed, last known wind data, and the last
known GPS position to estimate the airplane’s current position. DR
information will be available as long as the system remains in Enroute (ENR)
mode. If the system enters another mode, such as Terminal (TERM) when
within 30nm of the departure or destination, DR information will be removed
from the displays and amber NO FMS POSITION will be displayed on the
navigation maps.
TAWS-A GPWS mode 1-5 are operative.
SurfaceWatch is inoperative.
The TRAFFIC page display is not dependent on GPS information. The
position of displayed traffic relative to the airplane symbol on this page is still
accurate.
Procedure completed
IF GPS LOI AND/OR NO FMS POSITION IS DISPLAYED:
GPS LOI indicates that the system is in Loss of Integrity Mode. GPS information is either not
present or is invalid for navigation use.
NO FMS POSITION indicates the GPS position has been lost.
1. Navigation – Fly toward known visual conditions. Use ATC or other information
sources as available.
Continued on next page
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