What was found
NR 4 ENGINE BACKFIRING ON FINAL AND UPON LANDING. ENGINE SHUT DOWN AFTER LANDING. REPLACED NR 4 ENGINE, NR 15 & 16 Y-PIPE DUE TO BEING RUPTURED. CHECKED GOOD ON RUN.
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
NR 4 ENGINE BACKFIRING ON FINAL AND UPON LANDING. ENGINE SHUT DOWN AFTER LANDING. REPLACED NR 4 ENGINE, NR 15 & 16 Y-PIPE DUE TO BEING RUPTURED. CHECKED GOOD ON RUN.