Daher-Socata TBM 900 Pilot's Information Manual page 130

SECTION 3
EMERGENCY PROCEDURES
EASA Approved
Symptoms :
- Windshield being covered uniformly by ice
- No perception of heat when touching deiced section
- Windshield deicing green light is not lit
Symptoms may result from overheat. In that case :
1 - "WINDSHIELD" switch
In case of total failure :
1 - "TEMP/°C" selector
2 - "HOT AIR FLOW" distributor
Before landing wait for a sufficient visibility
Page 3.7.2
WINDSHIELD DEICING FAILURE
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PILOT'S OPERATING HANDBOOK
when necessary
turn to the left
Edition 0 -- October 31, 2013
OFF / ON
Maxi warm
Rev. 1