A C-208 captain reported multiple physiological impairments following performing a required inflight...

Narrative:

[While] enroute [I] activated the tks [weeping fluid anti-ice] system for [its required weekly] check. All fresh air vents closed and bleed air off. Had to activate backup mode to see any flow of tks fluid. Ran system for about 20 minutes. Experienced my usual symptoms even though all vents were closed. Those symptoms are: mild headache; nausea and sense of lightheadedness. The nausea and lightheadedness increased after landing and was accompanied by a general sense of fatigue. The lightheadedness precluded driving home for 50 minutes. Mild nausea continued for about 30 minutes. Headache and fatigue continued for about 2 hours. A sticky film covered the yoke; my hands and the uncovered portion of my arms. My only suggestion is to don [the crew] oxygen mask prior to activating the tks system and continue wearing it until engine shutdown.

Original NASA ASRS Text

Title: A C-208 Captain reported multiple physiological impairments following performing a required inflight check of the aircraft's TKS surface anti-icing system.

Narrative: [While] enroute [I] activated the TKS [weeping fluid anti-ice] System for [its required weekly] check. All fresh air vents closed and bleed air off. Had to activate backup mode to see any flow of TKS fluid. Ran system for about 20 minutes. Experienced my usual symptoms even though all vents were closed. Those symptoms are: mild headache; nausea and sense of lightheadedness. The nausea and lightheadedness increased after landing and was accompanied by a general sense of fatigue. The lightheadedness precluded driving home for 50 minutes. Mild nausea continued for about 30 minutes. Headache and fatigue continued for about 2 hours. A sticky film covered the yoke; my hands and the uncovered portion of my arms. My only suggestion is to don [the crew] Oxygen Mask prior to activating the TKS system and continue wearing it until engine shutdown.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.

Attributes
ACN	1207466
Time
Date	201409
Local Time Of Day	1801-2400
Place
Locale Reference	ZZZ.ARTCC
State Reference	US
Environment
Flight Conditions	VMC
Aircraft 1
Make Model Name	Caravan 208B
Operating Under FAR Part	Part 135
Flight Phase	Cruise
Component
Aircraft Component	De-Icing Fluid
Person 1
Function	Pilot Flying Single Pilot
Qualification	Flight Crew Air Transport Pilot (ATP)
Events
Anomaly	Aircraft Equipment Problem Less Severe Flight Deck / Cabin / Aircraft Event Illness

A C-208 captain reported multiple physiological impairments following performing a required inflight check of the aircraft's tks surface anti-icing system.