As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
IAD/RON - FLT 6459 - DURING CLIMB-OUT AT 1510 HRS ON 10-19-95, RETURNED TO IAD DUE TO THE RT ENGINE RPM FLUCTUATION. AIRCRAFT LANDED AT IAD WITH NO FURTHER INCIDENTS. MAINTENANCE REPLACED THE TACH GENERATOR. ALL OPS CHECKS GOOD. AIRCRAFT WAS RELEASED AND APPROVED FOR RETURN TO SERVICE. (X)