of 2500 ft. Pilots operating into an airport with a
runway length less than 2500 ft. may make a cold
temperature altitude correction in cold temperature
conditions, if desired. Comply with operating and
reporting procedures for CTAs.
e. ATC Reporting Requirements. Pilots must
advise ATC with the corrected altitude when applying
an altitude correction on any approach segment with
the exception of the final segment.
f. Methods to apply correction: The FAA
recommends operators/pilots use either the All
Segments Method or the Individual Segments
Method when making corrections at CTAs.
7-3-5. Cold Temperature Airport
Procedures
a. PILOTS MUST NOT MAKE AN ALTIMETER CHANGE to accomplish an altitude correction.
Pilots must ensure that the altimeter is set to the
current altimeter setting provided by ATC in
accordance with 14 CFR 91.121.
b. Actions on when and where to make
corrections: Pilots will make an altitude correction to
the published, "at", "at or above", and "at or below"
altitudes on all designated segment(s) to all runways
for all published instrument approach procedures
when the reported airport temperature is at or below
the published CTA temperature on the approach
plate. A pilot may request an altitude correction (if
desired) on any approach at any United States airport
when extreme cold temperature is encountered. Pilots
making a correction must comply with ATC reporting
requirements.
c. Correctable altitudes: ATC does not apply a cold
temperature correction to their Minimum Vectoring
Altitude (MVA) or Minimum IFR Altitude (MIA)
charts. Pilots must request approval from ATC to
apply a cold temperature correction to any ATC
assigned altitude. Pilots must not correct altitudes
published on Standard Instrument Departures (SIDs),
Obstacle Departure Procedures (ODPs), and Standard Terminal Arrivals (STARs).
d. Use of corrected MDA/DA: Pilots will use the
corrected MDA or DA as the minimum altitude for an
approach. Pilots must meet the requirements in 14
CFR Part 91.175 in order to operate below the
corrected MDA or DA. Pilots must see and avoid

obstacles when descending below the minimum
altitude on the approach.
NOTE-
The corrected DA or MDA does not affect the visibility
minima published for the approach. With the application of
a cold temperature correction to the DA or MDA, the
airplane should be in a position on the glideslope/glidepath or at the published missed approach point to identify
the runway environment.

e. How to apply Cold Temperature Altitude
Corrections on an Approach.
1. All Segments Method: Pilots may correct all
segment altitudes from the initial approach fix (IAF)
altitude to the missed approach (MA) final holding
altitude. Pilots familiar with the information in this
section and the procedures for accomplishing the all
segments method, only need to use the published
"snowflake" icon, /CTA temperature limit on the
approach chart for making corrections. Pilots are not
required to reference the CTA list. The altitude
correction is calculated as follows:
(a) Manual correction: Pilots will make a
manual correction when the aircraft is not equipped
with a temperature compensating system or when a
compensating system is not used to make the
correction. UseTBL 7-3-1, ICAO Cold Temperature
Error Table to calculate the correction needed for the
approach segment(s).
(1) Correct all altitudes from the final
approach fix (FAF)/PFAF up to and including the IAF
altitude: Calculate the correction by taking the
FAF/PFAF altitude and subtracting the airport
elevation. Use this number to enter the height above
airport column in TBL 7-3-1 until reaching the
reported temperature from the "Reported Temperature" row. Round this number as applicable and then
add to all altitudes from the FAF altitude through the
IAF altitude.
(2) Correct all altitudes in the final
segment: Calculate the correction by taking the MDA
or DA for the approach being flown and subtract the
airport elevation. Use this number to enter the height
above airport column in TBL 7-3-1 until reaching
the reported temperature from the "Reported
Temperature" row. Use this number or round up to
next nearest 100. Add this number to MDA or DA, as
applicable, and any applicable step-down fixes in the
final segment.

Cold Temperature Barometric Altimeter Errors, Setting Procedures and Cold Temperature
Airports (CTA)

7-3-3