What was found
WITH APU AND BLEEDS ON, CABIN FILLED WITH SMOKE WITH A GRINDING NOISE HEARD. WITH BLEEDS TURNED OFF, NOISE STOPPED. R & R ACM IAW WC 21-50-03. OPS AND LEAK CHECKED GOOD.
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
WITH APU AND BLEEDS ON, CABIN FILLED WITH SMOKE WITH A GRINDING NOISE HEARD. WITH BLEEDS TURNED OFF, NOISE STOPPED. R & R ACM IAW WC 21-50-03. OPS AND LEAK CHECKED GOOD.