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7-3-3. Effects of Cold Temperature on Baro-Vertical Navigation (VNAV) Vertical Guidance
Non-standard temperatures can result in a change to effective vertical paths and actual descent rates when using
aircraft baro-VNA V equipment for vertical guidance on final approach segments. A lower than standard
temperature will result in a shallower descent angle and reduced descent rate. Conversely, a higher than standard
temperature will result in a steeper angle and incr eased descent rate. Pilots should consider potential
Cold Temperature Barometric Altimeter Errors, Setting Procedures and Cold Temperature 7-3-1
Airports (CTA)

AIM 2/20/25
consequences of these effects on approach minima, power settings, sight picture, visual cues, etc., especially for
high-altitude or terrain-challenged locations and during low-visibility conditions.
REFERENCE-
AIM, Para 5-4-5, Instrument Approach Procedure (IAP) Charts.
a. Uncompensated Baro -VNA V note on 14 CFR part 97 IAPs. The area navigation (RNA V) global
positioning system (GPS) and RNA V required navigation performance (RNP) notes, "For uncompensated
Baro-VNA V systems, lateral navigation (LNAV)/VNA V NA below -XX degC (-XX degF) or above XX degC (XXX degF)"
and "For uncompensated Baro -VNA V systems, procedure NA below -XX  degC ( -XX degF) or above XX  degC
(XXX degF)" apply to baro-VNA V equipped aircraft. These temperatures and how they are used are independent
of the temperature and procedures applied for a Cold Temperature Airport.
1. The uncompensated baro-VNA V chart note and temperature range on an RNA V (GPS) approach is
applicable to the LNA V/VNA V line of minima. Baro -VNA V equipped aircraft without a temperature
compensating system may not use the RNA V (GPS) approach LNA V/VNA V line of minima when the actual
temperature is above or below the charted temperature range.
2. The uncompensated baro-VNA V chart note and temperature range on an RNA V (RNP) approach applies
to the entire procedure. For aircraft without a baro-VNA V and temperature compensating system, the RNA V
(RNP) approach is not authorized when the actual temperature is above or below the charted uncompensated
baro-VNA V temperature range.
b. Baro-VNA V temperature range versus CTA temperature: The baro-VNA V and CTA temperatures are
independent and do not follow the same correction or reporting procedures. However, there are times when both
procedures, each according to its associated temperature, should be accomplished on the approach.
c. Operating and ATC reporting procedures.
1. Do not use the CTA operating or reporting procedure found in this section, 7-3-4a thru 7-3-5e when
complying with the baro-VNA V temperature note on an RNA V (GPS) approach. Correction is not required nor
expected to be applied to procedure altitudes or VNA V paths outside of the final approach segment.
2. Operators must advise ATC when making temperature corrections on RNP authorization required (AR)
approaches while adhering to baro-VNA V temperature note.
3. Reporting altitude corrections is required when complying with CTAs in conjunction with the
baro-VNA V temperature note. The CTA altitude corrections will be reported in this situation. No altitude
correction reporting is required in the final segment.
NOTE-
When executing an approach with vertical guidance at a CTA (i.e., ILS, localizer performance with vertical guidance (LPV),
LNAV/VNAV), pilots are reminded to intersect the glideslope/glidepath at the corrected intermediate altitude (if applicable)
and follow the published glideslope/glidepath to the corrected minima. The ILS glideslope and WAAS generated glidepath
are unaffected by cold temperatures and provide vertical guidance to the corrected DA. Begin descent on the ILS glideslope
or WAAS generated glidepath when directed by aircraft instrumentation. Temperature affects the precise final approach fix
(PFAF) true altitude where a baro-VNAV generated glidepath begins. The PF AF altitude must be corrected when below the
CTA temperature restriction for the intermediate segment or outside of the baro-VNAV temperature restriction when using
the LNAV/VNAV line of minima to the corrected DA.