Citation Excel (C560XL)
Flight Crew Air Transport Pilot (ATP)
Aircraft Equipment Problem Less Severe; Flight Deck / Cabin / Aircraft Event Smoke / Fire / Fumes / Odor
Flight Crew Returned To Departure Airport; General Declared Emergency
Aircraft
During initial climb the ACM O'Heat Light illuminated; smoke with light haze and order was observed in cockpit and cabin. Completed abnormal checklist for ACM O'Heat and declared emergency. Completed all applicable checklist for landing and returned to [departure airport]. ACM O'Heat light extinguished and smoke dissipated prior to landing.
[Report narrative contained no additional information].
CE-560XL flight crew reported ACM Overheat light illuminated on climb out; accompanied by smoke and odor. Flight declared an emergency and returned to departure airport.