18
ERDC/CRREL TR-02-13
Table 5 (cont'd). Flight operations reports (by location) of scheduled flights
cancelled by ground icing.
Location
Oct
Nov
Dec
Jan
Feb
Mar
Apr
National Guard
No impact
1
0
0
0
0
0
1
Moderate
0
1
0
0
0
1
0
Indiana
Severe
0
0
1
1
1
0
0
No impact
1
0
0
0
0
1
1
Moderate
0
1
1
1
1
0
0
Minnesota
Severe
0
0
0
0
0
0
0
*Two returned questionnaires for 3rd MI BN at Camp Humphreys, Korea.
Key: No impact: Scheduled flights never cancelled as a result of ground icing.
Moderate impact: 110% of scheduled flights cancelled.
Severe impact: More than 10% of scheduled flights cancelled.
Note: The number of reports per month per location corresponds to the number of flight opera-
tions questionnaires returned from each location.
A more conservative criterion for assessing the impact of cancelled flights
would be to regard as few as 110% of scheduled flights being canceled as
significantly affecting aviation operations. Under this criterion, then flight
cancellations due to ground icing affect operations by a majority of the aviation
units in Germany and Korea and at Forts Drum and Campbell.
In all cases, the impact of ground icing on a unit depends on whether that
unit's aircraft are exposed to icing conditions. Aircraft that are customarily
hangared, or that are hangared in advance of specific ground icing events, remain
operational. Aircraft that must undergo deicing prior to flight are more likely to
be subject to flight cancellations in the immediate aftermath of a storm.
b. Cancellation of scheduled flights due to actual or forecast icing.
More aviation units are affected by actual or forecast in-flight icing than by
ground icing. This is reasonable since all scheduled flights in winter are subject
to cancellation if icing conditions are expected in the flight profile, but only
aircraft that are not hangared are exposed to ground icing. Cancellations caused
by actual or forecast icing conditions in the flight profile typically occur from
December through February, but for some units the season for cancelled flights
due to icing extends from November through March (Table 6). The F-159th
(MHC) (12th Avn Bde) in Giebelstadt, Germany, experiences a severe impact on
operations (more than 10% of flights cancelled) from October through April.
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