Learjet 35
Flight Crew Air Transport Pilot (ATP); Flight Crew Multiengine; Flight Crew Instrument
Situational Awareness
Aircraft Equipment Problem Less Severe; Flight Deck / Cabin / Aircraft Event Smoke / Fire / Fumes / Odor
Air Traffic Control Provided Assistance; Flight Crew Requested ATC Assistance / Clarification; Flight Crew Returned To Departure Airport; Flight Crew Landed As Precaution; General Flight Cancelled / Delayed
Aircraft
While on initial climb out; myself and the medical crew noticed a burning smell coming from the back of the cabin. I turned off all the blowers and A/C (Air Conditioning) thinking as these might have been the cause; continuing to fly for some more time; it was evident that the smell hadn't gone away. I made the decision to turn back to ZZZ and swap planes. We did not need to dump fuel; and landed under max landing weight.
Learjet-35 Captain reported a cabin fumes event resulting in a return to the departure airport.