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Light Ice Pellets Mixed
with Light Rain
(Operations Not
Authorized below 0C
OAT)
25 Minutes
(Operations
Not
Authorized
below 0C
OAT)
Not
Applicable
(Operations
Not
Authorized
below 0C
OAT
Federal Aviation 16 16
Administration
FAA Icing Program Update
September 26, 2007
Ageing Of Fluid With Imbedded
Ice Pellets
If the ice pellet condition stops, and the
allowance time has not been exceeded, and
the outside air temperature (OAT) has
remained constant or increased from the
temperature on which the allowance time
was based, the operator is permitted to
consider the Type IV anti-icing fluid
effective without any further action up to 90
minutes after the start of the application
time of the Type IV anti-icing fluid.
Federal Aviation 17 17
Administration
FAA Icing Program Update
September 26, 2007
Some Examples:
If Type IV anti-icing fluid is applied with a
start of application time of 10:00, OAT is
0oC, light ice pellets fall until 10:20 and stop
and do not restart. The allowance time
stops at 10:50; however, provided that the
OAT remains constant or increases and that
no precipitation restarts after the allowance
time of 10:50, the aircraft may takeoff
without any further action up to 11:30.
Federal Aviation 18 18
Administration
FAA Icing Program Update
September 26, 2007
One Last Example:
On the other hand, if Type IV anti-icing fluid
is applied with a start of application time of
10:00, OAT is 0oC, light ice pellets mixed
with freezing drizzle falls until 10:10 and
stops and restarts at 10:30 with the
allowance time stopping at 10:25, the
aircraft may not takeoff, no matter how
short the time or type of precipitation after
10:25, without being deiced, and anti-iced if
precipitation is present.
Federal Aviation 19 19
Administration
FAA Icing Program Update
September 26, 2007
Pilot Assessment of Precipitation
Intensities
Ambiguity in the regulations, some air
carriers had authorizations for flightcrews
to operate using their own determination of
precipitation type and intensity when
different from the officially reported weather
and others did not.
– Guidelines in the upcoming Notice will level the
playing field, require air carriers to have established
procedures, increase standardization, establish
limitations for its use, and require accountability
procedures
Federal Aviation 20 20
Administration
FAA Icing Program Update
September 26, 2007
Implementation of the Use of
Liquid Water Equivalent for
Precipitation Intensity
More accurate holdover times
– Anti-icing fluid failure time under a given temperature is a direct
correlation to the amount of water the precipitation contains
Test data being validated now
– Targeting mid-season implementation for snow intensity levels
at four test sites, DEN, MSP, PIT, and ORD
First step in a whole new way and level of accuracy in
determining holdover times
– Will be expanded to all forms of precipitation
– Hopefully will be able to use data from current ASOS collection
devices located at many airports
– Will lead to the implementation of a “check time” like system for
holdover times
Federal Aviation 21 21
Administration
FAA Icing Program Update
September 26, 2007
FAA/Industry Aircraft Ground
Deicing Workgroup
• Formed in Spring of 2007
• First meeting was held on April 17,2007
• Goal, to open up clear communications and provide
for coordination between industry and the FAA on
Aircraft Ground Deicing related issues
• Industry Co-chair Mr. Paul Railsback of ATA
• FAA Co-chair, yours truly
• Planned meetings twice per year spring and fall,
and will spin off smaller subgroups to address
particular issues
Federal Aviation 22 22
Administration
FAA Icing Program Update
September 26, 2007
Rewrite AC 120-60B
• Very high priority for FAA Flight Standards
– Become sole guidance document for Aircraft Ground De/antiicing
programs
• Receiving and storage of fluids quality control
• Application equipment standards and requirements
• Standardized application procedures for aircraft make and model
• Standardized communication ground and flightcrew
• Ground and flightcrew training program requirements
• Record keeping requirements
　
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