As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING APPROACH, THERE WAS AN UNCOMMANDED LOSS OF 400 ENGINE RPM. ENGINE POWER WAS RESTORED BRIEFLY BEFORE A 400 RPM LOSS RECURRED. THE PILOTS WERE ABLE TO AGAIN RESTORE POWER AND PERFORM A SAFE LANDING. INSPECTION REVEALED THE CARBURETOR HAD FAILED AND WAS CAUSING COMPLETE ENGINE SHUTDOWNS OR RPM LOSSES. EXACT MODE OF FAILURE WITHIN CARB IS UNKNOWN AT THIS TIME. CARB INSTALLED NEW ONE MONTH PRIOR