As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON ORIGINAL FACTORY UNIT, FOUND BRUSH HOLDER NOT CORRECTLY ALIGNED WITH SLIP RINGS CAUSING BRUSH TO RIDE OFF OF EDGE ONTO PHENOLIC INSULATOR. THIS CAUSES 'ALT. OUT' CONDITION. SUBMITTER SUGGESTS FACTORY CHECK SLIP RING POSITION ON ROTOR SHAFT TO ASSURE CORRECT ALIGNMENT. (HAVE SEEN THIS SAME PROBLEM MANY TIMES).