GPS/NAV COMPUTER SYSTEM FAILURES
#1 GPS/NAV Failure
If a failure occurs in the #1 GPS/NAV system (GIA), the other GPS/NAV
system will automatically provide GPS information to both displays. Check
the GPS/NAV circuit breakers to ensure they are both in. If one is open, try
resetting it (push in). If it pops back out, DO NOT reset it.
#1 NAV and #1 COM frequency information will not be displayed on any of
the ight displays. If COM #1 is used, all transmissions will be broadcast on
121.5 MHz. 121.5 MHz is automatically selected when a failure occurs in the
system. COM #2 and NAV #2 may be used as normal.
TAWS will also fail since it receives GPS position from the #1 GPS. Use
additional caution to maintain visual separation from terrain.
The following annunciations will be shown on the PFD:
TAWS FAIL – Terrain Avoidance Warning System has failed.
BOTH ON GPS 2 – Both PFD units are receiving GPS data from the No. 2 GIA unit.
GMA 1 FAIL – GMA 1 is inoperative. A communication failure with GMA 1 (Pilot’s
Audio Panel) has occurred. If COM 1 is selected on the pilot’s audio panel, the
pilot’s transmissions will be broadcast on 121.5 MHz.
BACKUP PATH – XPDR 1 using backup data path. The transponder is using a
backup data path.
AHRS 2 GPS – AHRS 2 not receiving backup GPS information.
WARNING: The following caution and warning annunciations will NOT be
able to be displayed if the #1 GPS/NAV computer has failed:
RESERVOIR FUEL PITOT OFF L-R FUEL LOW L-R
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