Caravan 208B
Flight Crew Air Transport Pilot (ATP)
Confusion; Physiological - Other; Situational Awareness
Aircraft Equipment Problem Less Severe; Deviation / Discrepancy - Procedural Published Material / Policy; Flight Deck / Cabin / Aircraft Event Illness / Injury; Inflight Event / Encounter Weather / Turbulence
General Physical Injury / Incapacitation
Aircraft; Human Factors; Procedure
Aircraft departed IFR into low IMC conditions with full tank of TKS fluid. Aircraft was IMC entire flight. TKS system was on; aircraft encountered light icing while enroute to my filed destination. Pilot noted several symptoms consistent with TKS exposure warnings on MSDS; such as a 'buzzed' feeling at the time of exiting the aircraft after landing. By end of flight; it took more concentration than normal to read back ATC instructions; complete approach in weather; and taxi around busy major airport; Aircraft landed with 5 gallons remaining of TKS fluid; enough for approximately 19 minutes of icing capabilities remaining at middle setting.  Pilot was coughing after flight; not before; and voice had become raspy during flightAircraft has no range in IMC conditions due to TKS quantity and middle setting having approximately a range of 1:20 minutes. TKS has already been confirmed inside TKS Caravan aircraft type.
A C208 pilot described his physiological 'buzzed' feeling after exposure to TKS anti-ice fluid in flight during freezing IMC conditions.