What was found
ON GROUND WITH APU SUPPLYING BLEED AIR, RIGHT ACU SELECTED ON, SMOKE ENTERED THE CABIN. FOUND RIGHT ACU TURBINE SEIZED. REPLACED ACU TURBINE.
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
ON GROUND WITH APU SUPPLYING BLEED AIR, RIGHT ACU SELECTED ON, SMOKE ENTERED THE CABIN. FOUND RIGHT ACU TURBINE SEIZED. REPLACED ACU TURBINE.