TM 1-1510-223-10
5-10.2 Change 3
5-33A.
ICING LIMITATIONS (SEVERE).
WARNING
Severe icing may result from environmental
conditions outside of those for which the air-
plane is certificated. Flight in freezing rain,
freezing drizzle, or mixed icing conditions
(supercooled liquid water and ice crystals)
may result in a build-up on protective sur-
faces exceeding the capability of the ice
protections system, or may result in ice
forming aft of these protected surfaces. This
ice may not shed using ice protection sys-
tems, and may seriously degrade the perfor-
mance and controllability of the airplane.
a. During flight, severe icing conditions that exceed
those for which the airplane is certificated shall be deter-
mined by the following visual cues. If one or more of
these visual cues exists, immediately request priority
handling from air traffic control to facilitate a route or an
altitude change to exit the icing conditions:
(1) Unusually extensive ice accreted on the air-
frame in areas not normally observed to collect ice.
(2) Accumulation of ice on the upper (or lower, as
appropriate) surface of the wing aft of the protected area.
(3) Accumulation of ice on the propeller spinner
farther aft than normally observed.
b. Since the autopilot may mask tactile cues that indi-
cate adverse changes in handling characteristics, use of
the autopilot is prohibited when any of the visual cues
specified above exist, or when unusual lateral trim re-
quirements or autopilot trim warnings are encountered
while the airplane is in icing conditions.
NOTE
All icing detection lights must be operative prior
to flight into icing conditions at night. This super-
sedes any relief provided by the master mini-
mum equipment list (MMEL) or equivalent.
5-33B. CROSSWIND LIMITATIONS.
WARNING
Landing with wind conditions in excess of the
demonstrated crosswind component may result
in damage to the aircraft. This should only be
attempted during emergency situations.
The maximum demonstrated crosswind component
is 20 knots at 90 degrees. Landing the aircraft in a crab
will result in side loads on the landing gear and should be
recorded on DA Form 2408-13-1. Refer to Chapter 8 for
crosswind landing techniques.
5-34. OXYGEN REQUIREMENTS.
a. Oxygen requirements will be in accordance with
AR 95-1.
b. Oxygen system data/duration tables are found in
Chapter 2.
5-35. CABIN PRESSURE LIMITS.
Maximum cabin differential pressure is 6.5 PSI.
5-36. CRACKED CABIN WINDOW/WINDSHIELD.
If a crack occurs in any side window or windshield, air-
craft operation is limited to 25,000 feet or less and cabin
pressurization of 4.0 PSI or less as required to complete
the flight. The aircraft shall not be flown again until main-
tenance actions are conducted unless proper authoriza-
tion is obtained for a ferry flight to a location where a
maintenance action can be performed.
If a crack develops in any side window or windshield
in flight, refer to Chapter 9, Emergency Procedures.
