As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CRUISE AND LANDING, THE NR 1 ENGINE IGNITION LIGHT WOULD ILLUMINATE AND THE LEFT PROPELLER WOULD SURGE VIOLENTLY ANYTIME THE LEFT POWER LEVER WAS BELOW 20 PERCENT. THE PROPELLER SURGED TO APPROX 1400 RPM. R & R ROD END LOCK WASHER AT LEFT PCU, ALIGHMENT CHECK OF THE POWER LEVER CONTROL CABLE CHECKED GOOD IAW AMM 76-10-00-05. FAILURE OF A WASHER THAT IS POSITIONED BETWEEN THE ROD END AND PCU CONTROL ARM,