What was found
ACRID SMELL IN THE COCKPIT AND CABIN. OFF THE GATE HEAVY ACRID ODOR IN FLIGHT DECK, FLIGHT BACK TO GATE. UNABLE TO DETERMINE SOURCE.
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
ACRID SMELL IN THE COCKPIT AND CABIN. OFF THE GATE HEAVY ACRID ODOR IN FLIGHT DECK, FLIGHT BACK TO GATE. UNABLE TO DETERMINE SOURCE.