As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
IN CRUISE FLIGHT, THE LT RADIAL ENGINE OIL SYSTEM REAR CHIP LIGHT ILLUMINATED INTERMITTENTLY, THEN WENT TO STEADY ON. NO OTHER ABNORMAL INDICATIONS WERE NOTED. ENGINE WAS SHUTDOWN AND SECURED AS A PRECAUTIONARY MEASURE AND CREW RETURNED TO BASE, JETTISONED THE RETARDANT LOAD, AND PERFORMED AN UNEVENTFUL LANDING. ON INSPECTION OF THE CHIP DETECTOR AND SCAVENGE SCREENS, NO DEFECTS WERE NOTED. R & R THE CHIP DETECTOR AND INSPECTED THE CHIP PLUG HARNESS. AIRCRAFT WAS RETURNED TO SERVICE.