TM 55-1510-219-10
NOTE
When operating on wet or icy runways, refer to
stopping distance factors shown in Chapter 7.
8-57A. ICING (SEVERE).
a. The following weather conditions may be conducive
to severe in-flight icing:
(1) Visible rain at temperatures below zero degrees
Celsius ambient air temperature.
(2) Droplets that splash or splatter on impact at
temperatures below zero degrees Celsius ambient air
temperature.
b. The following procedures for exiting a severe icing
environment are applicable to all flight phases from takeoff
to landing.
(1) Monitor the ambient air temperature. While
severe icing may form at temperatures as cold as -18
degrees Celsius, increased vigilance is warranted at
temperatures around freezing with visible moisture present.
(2) Upon observing the visual cues specified in the
limitations section of the airplane flight manual (Military
Operations Manual) for the identification of severe icing
conditions (reference paragraph 5-31B.), accomplish the
following:
(a) Immediately request priority handling from
air traffic control to facilitate a route or an altitude change
to exit the severe icing conditions in order to avoid
extended exposure to flight conditions more severe than
those for which the airplane has been certificated.
(b) Avoid abrupt and excessive maneuvering
that may exacerbate control difficulties.
(c) Do not engage the autopilot.
(d) If the autopilot is engaged, hold the control
wheel firmly and disengage the autopilot.
(e)
If
an
unusual
roll
response
or
uncommanded roll control movement is observed, reduce
the angle-of-attack.
(f) Do not extend flaps during extended
operation in icing conditions. Operations with flaps
extended can result in a reduced angle-of-attack, with the
possibility of ice forming on the upper surface further aft
on the wing than normal, possibly aft of the protected area.
(g) If the flaps are extended, do not retract
them until the airframe is clear of ice.
(h) Report these weather conditions to air
traffic control.
Change 3
8-26.1
