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AIM

10/12/17

5

−1−31

Preflight

available along the entire route of flight. Outside the U.S.
or in areas where WAAS coverage is not available,
operators using TSO

−C145/C146 receivers are required to

check GPS RAIM availability.

5

−1−17. Cold Temperature Operations

Pilots should begin planning for operating into
airports with cold temperatures during the preflight
planning phase. Instrument approach charts will
contain a snowflake symbol and a temperature when
cold temperature correction must be applied. Pilots
operating into airports requiring cold temperature
corrections should request the lowest forecast
temperature at the airport for departure and arrival
times. If the temperature is forecast to be at or below
any published cold temperature restriction, calculate
an altitude correction for the appropriate segment(s)

and/or review procedures for operating automatic
cold temperature compensating systems, as applica-
ble. The pilot is responsible to calculate and apply the
corrections to the affected segment(s) when the actual
reported temperature is at or below any published
cold temperature restriction, or pilots with automatic
cold temperature compensating systems must ensure
the system is on and operating on each designated
segment. Advise ATC when intending to apply cold
temperature correction and of the amount of
correction required on initial contact (or as soon as
possible) for the intermediate segment and/or the
published missed approach. This information is
required for ATC to provide aircraft appropriate
vertical separation between known traffic.

REFERENCE

AIM, Paragraph 7

−2−3 , Altimeter Errors 

AIM TBL 7

−2−3, ICAO Cold Temperature Error

2/28/19

AIM