2-71
KMD 250 Pilot's Guide
Section 2
FIS Operation
Rev 4 Aug/2007
/WX
: Weather Phenomenon (can include flight visibility, precipitation
and restrictions to visibility.
/TA
: Outside air temperature at altitude in degrees Celsius.
/WV
: Wind (direction in degrees magnetic north and speed in knots)
/TB:
Turbulence (refer to the Airman’s Information Manual)
CAT
- Clear Air Turbulence
CHOP
- Choppy Turbulence
OCNL
- Occasional
NEG
- No Turbulence
ABV
- Above
BLO
- Below
LGT
- Light - Momentarily causes slight, erratic changes in
altitude and/or attitude.
MOD
- Moderate - Greater intensity changes in altitude and/or
attitude, but aircraft remains in positive control at all times.
Usually causes changes in indicated airspeed.
SEV
- Severe - Causes large and abrupt changes to aircraft
altitude and/or attitude. Large variations in indicated airspeed
and momentary loss of control.
EXTRM
- Extreme - Aircraft is violently tossed about and is
nearly impossible to control. May cause structural damage.
/IC
:
Icing (refer to the Airman’s Information Manual)
CLR
- Clear
MX
- Mixed (combination of rime and clear icing)
NEG
- No Icing
ABV
- Above
BLO
- Below
Trace - Ice becomes perceptible. Rate of evaporation is
almost equal to the rate of accumulation. Deicing/anti-icing
equipment is not utilized unless encountered for a period of
time greater than 1 hour.
LGT
- Light - Rate of accumulation may be a problem if flight
is prolonged for longer than 1 hour without deicing/anti-icing
equipment. Deicing/anti-icing removes and/or prevents accu-
mulation.
MOD
- Moderate - The rate of accumulation is such that even
short encounters become potentially hazardous. Use of
deicing/anti-icing equipment or diversion is necessary.
SEV
- Severe - Flight diversion is necessary. Deicing/anti-
icing equipment is not effective.
Understanding Weather Reports
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Summary of Contents for KMD 250
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