Textron Cessna Grand Caravan Ex 208B Pilot's Operating Handbook And Faa Approved Airplane Flight Manual page 659

CESSNA
MODEL 208B 867 SHP
GARMIN G1000
LIMITATIONS
VISUAL AND TACTILE CHECK
To assure the absence of frost, a tactile check of the wing leading edge
and upper surface, as specified in Section 4, Normal Procedures of the
basic POH/AFM, is required in addition to a visual inspection if the OAT
is below 10°C (50°F). During ground icing conditions, takeoff must be
accomplished within 5 minutes of completing the tactile check unless
the airplane is operated per 14 CFR 135.227(b)(3).
Ground icing conditions are defined as:
1. The OAT is 2°C (36°F) or below and visible moisture is present
(i.e. rain, drizzle, sleet, snow, fog, water is present on the wing,
etc.), or,
2. The OAT is 5°C (41°F) or below and conditions are conducive to
active frost formation (e.g. clear night with a dew point
temperature/OAT difference of 3°C (5°F) or less).
The upper surface of each wing must be inspected for the condition
and presence of Vortex Generators (VGs). Each wing must have all 10
VGs installed on the upper surface. All 10 VGs must be present on
each wing or takeoff is prohibited for any flight regardless of planned
flight into known or forecast icing.
Takeoff is prohibited if frost, ice or snow may reasonably be expected to
adhere to the airplane between the tactile check and takeoff (e.g. snow
near freezing temperature with no ground deicing/anti-ice fluid
application).
FAA APPROVED
208BPHCUS-S1-00
(Continued)
SECTION 9 - SUPPLEMENTS
SUPPLEMENT 1
U.S.
S1-7