Chancellor 414A / C414
Situational Awareness
Aircraft Equipment Problem Less Severe; Inflight Event / Encounter Fuel Issue
Flight Crew Landed As Precaution; Flight Crew Diverted; Flight Crew Landed in Emergency Condition
Human Factors
The aircraft was fueled by the [airport] FBO. The tanks were checked after and appeared to contain 100LL. After Takeoff abnormal indications were observed by the pilot flying and pilot observing. High CHT temps were the main concern. Power was reduced and airspeed was increased to remedy the problem. There was no change. The pilot observing requested to see the fuel receipt from the pilot flying. The receipt indicated that the aircraft was fueled with Jet A. The pilot observing who the more experienced pilot is; was called for the controls and took over the aircraft. The aircraft was immediately turned towards [a diversion airport]. Approach was notified. The crew switched to the aux tanks which contained uncontaminated 100LL. The aircraft safely landed. The crew and passengers were unharmed.
[Report narrative contained no additional information.]
The flight crew of a C-414 reported that the aircraft was fueled using 'Jet A' instead of 100 LL fuel.