What was found
ORD - FLT 5020 - THE NR 1 ENGINE NP ACCELERATED TO 80 PERCENT, THEN DROPPED TO 40 PERCENT ON TAXI. MAINTENANCE REPLACED THE BETA TUBE O-RINGS, OPS CHECK GOOD. (W)
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
ORD - FLT 5020 - THE NR 1 ENGINE NP ACCELERATED TO 80 PERCENT, THEN DROPPED TO 40 PERCENT ON TAXI. MAINTENANCE REPLACED THE BETA TUBE O-RINGS, OPS CHECK GOOD. (W)