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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.


AIM, Paragraph 7−2−3 , Altimeter Errors 

AIM TBL 7−2−3, ICAO Cold Temperature Error