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3.2

Abnormal Procedures

3.2.1 LOSS OF GPS/SBAS NAVIGATION DATA

When the GPS/SBAS receiver is inoperative or GPS navigation information is

not available or invalid, the GTN will enter one of two modes: Dead Reckoning

mode (DR) or Loss Of Integrity mode (LOI). The mode is indicated on the GTN

by an amber "DR" or "LOI".

If the LOI annunciation is displayed, revert to an alternate means of navigation

appropriate to the route and phase of flight.

If the DR annunciation is displayed, the map will continue to be displayed with

an amber "DR" overwriting the ownship icon. Course guidance will be removed

on the CDI. Aircraft position will be based upon the last valid GPS position,

then estimated by Dead Reckoning methods. Changes in true airspeed, altitude,

heading, or winds aloft can affect the estimated position substantially. Dead

Reckoning is only available in Enroute and Oceanic modes. Terminal and

Approach modes do not support Dead Reckoning.

If Alternate Navigation Sources (ILS, LOC, VOR, DME, ADF) Are

Available:

Navigation ......................................................... USE ALTERNATE SOURCES

If No Alternate Navigation Sources Are Available:

DEAD RECKONING (DR) MODE:

Navigation ............................................................................................. USE GTN

All information normally derived from GPS will become less

accurate over time.

LOSS OF INTEGRITY (LOI) MODE:

Navigation ..................... FLY TOWARDS KNOWN VISUAL CONDITIONS

All information derived from GPS will be removed.

The airplane symbol is removed from all maps. The map will

remain centered at the last known position. "NO GPS

POSITION" will be annunciated in the center of the map.

190-01007-A2 Rev. 6

Page 20

NOTE

AFMS, Garmin GTN GPS/SBAS System

FAA APPROVED