Dual GPS/NAV Failure
If both GPS/NAV (GIA) systems fail, check that both GPS/NAV circuit
breakers are pushed in. If one or both are open, try resetting them (push in).
If they pop back out DO NOT reset them.
Navigation, Communication, Transponder, and Engine information will not
be displayed on any of the Garmin displays. No trafc or weather avoidance
information will be available either.
Even though the COM Frequency Boxes are marked with red X’s, with
COM 1 selected on the pilot’s audio panel, the pilot’s transmissions will
be broadcast on 121.5 MHz. It is recommended that if in VMC (Visual
Meteorological Conditions), the pilot should maintain VFR (Visual Flight
Rules). If in IMC (Instrument Meteorological Conditions), it is recommended
that the pilot request Air Trafc Control for vectors to VFR conditions.
The following annunciations will be shown on the PFD:
TAWS FAIL – Terrain Avoidance Warning System has failed.
BOTH ON GPS 1 – Both PFD units were receiving GPS data from the No.1 GIA
unit when the 1st GPS/NAV failure occurred. GPS information is not being received
when both GPS/NAV systems fail.
Figure 3A-7 – Dual GPS/NAV (GIA) Failure
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