190-00870-02 Rev. A
Garmin G950 Pilot’s Guide for the Pilatus PC-6
79
FLIGHT INSTRUMENTS
SY
STEM
O
VER
VIEW
FLIGHT
INSTRUMENTS
EIS
AUDIO P
ANEL
& CNS
FLIGHT
MANA
GEMENT
HAZARD
AV
OID
ANCE
AFCS
ADDITIONAL
FEA
TURES
APPENDICES
INDEX
2.4 ABNORMAL OPERATIONS
ABNORMAL GPS CONDITIONS
The annunciations listed in Table 2-3 can appear on the HSI when abnormal GPS conditions occur; see Figure
2-43 for examples. Refer to the Flight Management Section for more information on Dead Reckoning Mode.
Annunciation
Location
Description
LOI
Lower left of
aircraft symbol
Loss of Integrity Monitoring–GPS integrity is insufficient for the current
phase of flight
INTEG OK
Lower left of
aircraft symbol
Integrity OK–GPS integrity has been restored to within normal limits
(annunciation displayed for 5 seconds)
DR
Upper right of
aircraft symbol
Dead Reckoning–System is using projected position rather than GPS position
to compute navigation data and sequence active flight plan waypoints
Table 2-3 Abnormal GPS Conditions Annunciated on HSI
Figure 2-43 Example HSI Annunciations
Dead Reckoning Mode causes the CDI to be removed from the display (when GPS is the selected navigation
source) and the following items on the PFD to be shown in yellow:
• Current Track Indicator
• Wind Data
• Ground Speed
• Distances in the Bearing Information windows
• GPS bearing pointers
These items should be verified when operating in Dead Reckoning Mode as they become increasingly
inaccurate over time.
