What was found
FLT 690 - SHUT DOWN NR 4 ENGINE DUE TO BACKFIRING. REPLACED NR 3 CYLINDER.
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
FLT 690 - SHUT DOWN NR 4 ENGINE DUE TO BACKFIRING. REPLACED NR 3 CYLINDER.