What was found
THE PILOT WAS PRACTICING APPROACHES WHEN HIS PDF WITHOUT WARNING WENT BLANK. CYCLING THE POWER INITIALLY DID NOT HELP. ON GROUND THE UNIT WOULD GO BLANK, NOT REVERTING TO THE BACK UP BATTERY, THEN REINITIALIZE INTERMITTENTLY.
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
THE PILOT WAS PRACTICING APPROACHES WHEN HIS PDF WITHOUT WARNING WENT BLANK. CYCLING THE POWER INITIALLY DID NOT HELP. ON GROUND THE UNIT WOULD GO BLANK, NOT REVERTING TO THE BACK UP BATTERY, THEN REINITIALIZE INTERMITTENTLY.