What was found
ORD - AIR TURN BACK, AFTER CAPTAINS ALTIMETER, ALTITUDE PRESELECT, TCAS AND TRANSPONDER FAILED. MAINTENANCE CLEANED SEVERAL CANNON PLUGS. (M)
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
ORD - AIR TURN BACK, AFTER CAPTAINS ALTIMETER, ALTITUDE PRESELECT, TCAS AND TRANSPONDER FAILED. MAINTENANCE CLEANED SEVERAL CANNON PLUGS. (M)