As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON TAKEOFF AT 300 FT SMOKE FILLED CABIN AND A SOUND OF SOMETHING WHIRRING AND WINDING DOWN WAS HEARD AS ENGINE BLEEDS WERE TURNED ON. WE IMMEDITATELY SHUT OFF AIR SOURCE AND APU TO ISOLATE ALL AIR AND SMOKE DISSIPATED QUICKLY. SUSPECT ACM FAILURE. CORRECTIVE ACTION: REPLACED ACM. OPS CHECK GOOD. IAW CL-350 AMM 21-52-13