As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ALTERNATOR WAS INSTALLED ON THE AIRCRAFT WITHOUT REMOVING THE COOLING FAN FROM THE ALTERNATOR PER THE ENSTROM MM. FAN THREW A BLADE WHICH PUNCTURED THE OIL COOLER CAUSING LOSS OF ENGINE OIL. SUBMITTER SUGGESTED BULLETINS CALLING FOR INSPECTION OF INSTALLING OF COOLING FAN AND REMOVAL IF FOUND INSTALLED. THIS PERTAINS TO ALL PISTON ENGINE MODEL ENSTROM HELICOPTERS.