Cessna Citation Sovereign (C680)
Flight Crew Air Transport Pilot (ATP)
Flight Deck / Cabin / Aircraft Event Smoke / Fire / Fumes / Odor
Aircraft Equipment Problem Dissipated; Flight Crew Returned To Departure Airport; General Maintenance Action
Aircraft
Shortly after takeoff; unusual smoke and odor came through WEMAC vents with the APU off. Notified ATC of problem and elected to return to our departure airport. Leveled off aircraft and smoke seemed to stop. Pilot not flying had time to run part of checklist; shut off left bleed source which seemed to stop odor. [We] landed without further event.
A Citation flight crew returned to their departure airport after unusual smoke and odors were detected emanating from the air conditioning vents.