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6/17/21 

AIM 

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. 

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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, Chapter 7, Section 3, Cold Temperature Barometric Altimeter 
Errors, Setting Procedures, and Cold Temperature Airports (CTA). 
AIM, TBL 7

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1, ICAO Cold Temperature Error Table. 

Preflight 

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