As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT NR 6282 - IAD-HPN - DURING CLIMB-OUT RETURNED TO IAD DUE TO LEFT ENGINE RPM DROPPED TO ZERO ON CLIMB-OUT. AIRCRAFT RETURNED TO IAD WITH NO FURTHER INCIDENT. MAINTENANCE REPLACED LEFT TACH GEN. AIRCRAFT WAS RELEASED AND APPROVED FOR RETURN TO SERVICE. (M)