What was found
AIRCRAFT RETURNED TO BLOCKS DUE TO FAILURE OF ALL RADIO/AIR DATA INSTRUMENTS ON CAPTAIN'S SIDE. FOUND ESSENTIAL RADIO BUS C/B OPEN, DUE TO HISTORY OF C/B OPENING REPLACED C/B. CHECKED SYSTEM PER MM 34-13-00 AND 24-50-02.
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
AIRCRAFT RETURNED TO BLOCKS DUE TO FAILURE OF ALL RADIO/AIR DATA INSTRUMENTS ON CAPTAIN'S SIDE. FOUND ESSENTIAL RADIO BUS C/B OPEN, DUE TO HISTORY OF C/B OPENING REPLACED C/B. CHECKED SYSTEM PER MM 34-13-00 AND 24-50-02.