seagull
Well-Known Member
Discussion the other day on the topic so thought I'd post an older article:
Cold Temperature and Wind Effects on Altimetry
Cold Temperature and Wind Effects on Altimetry
Cold Temperature and Wind Effects on Altimetry
- Thread starter seagull
- Start date
typhoonpilot
Well-Known Member
The background on that makes it impossible to read Shem
TP
TP
z987k
Well-Known Member
You guys are aware of the cold temperature correction now mandatory for approaches? There's a snowflake in the top corner of the approach chart and you have to add X feet to MDA as well as notify ATC that you are applying the correction. It's in the AIM as well as a notice that the FAA put out last December.
FAA Safety Team | Safer Skies Through Education
Cold temperature altitude corrections at “Cold Temperature Restricted Airports”
Notice Number: NOTC5758
Cold Temperature Restricted Airports have now been designated in the United States National Airspace System. The list of airports, the segment of the approach requiring the altitude correction and operating procedures may be found in the Notice to Airmen Publication (NTAP) http://www.faa.gov/air_traffic/publications/notices/ Part 4. Graphic Notices, Section 1. General. Cold Temperature Restricted Airports. The list will also be available as a PDF on the bottom of the FAA Digital Products, “Terminal Procedures Basic Search” page: http://www.faa.gov/air_traffic/flight_info/aeronav/digital_products/dtpp/search/
A symbol will be placed on the approach plates for the restricted airport. The symbol indicates a cold temperature altitude correction is required on this approach when reported temperature is at or below the published temperature. The list should be reviewed to determine which segment or segments of the approach require an altitude correction. Some airports may have two temperature restrictions. Temperatures for Cold Temperature Restricted Airports are completely separate from the temperatures published on RNAV approaches. Temperature restrictions on RNAV approaches must be followed, even if warmer than the temperature listed with the snowflake symbol.
New verbiage will also be found throughout the AIM regarding Cold Temperature Altitude Corrections. Pilots must understand they are responsible for applying altitude corrections and advising ATC when these corrections are to be made. Advising ATC of altitude corrections in the final segment is not required. Air Traffic Control will not be responsible for making any altitude corrections and/or advising pilots that an altitude correction is required at the restricted airport.
Cold temperature altitude corrections are only required at the listed airports and only at or below the restricted temperature(s). Applying this procedure is not required at any airfield greater than 2500 feet that is not included on the Cold Temperature Restricted Airport list.
Recommended Actions: Operators of aircraft, directors of safety, directors of operations, chief pilots, dispatch supervisors, fractional ownership program managers and training managers should accomplish the following:
1. View Notice to Airmen Publication (NTAP) http://www.faa.gov/air_traffic/publications/notices/ Part 4.
Graphic Notices, Section 1. General - Cold Temperature Restricted Airports.
2. Understand the procedures required at Cold Temperature Restricted Airports.
Contact: Questions or comments should be directed to Kel Christianson, Aviation Safety Inspector, AFS-470 at (202) 267-8838.
FAA Safety Team | Safer Skies Through Education
Cold temperature altitude corrections at “Cold Temperature Restricted Airports”
Notice Number: NOTC5758
Cold Temperature Restricted Airports have now been designated in the United States National Airspace System. The list of airports, the segment of the approach requiring the altitude correction and operating procedures may be found in the Notice to Airmen Publication (NTAP) http://www.faa.gov/air_traffic/publications/notices/ Part 4. Graphic Notices, Section 1. General. Cold Temperature Restricted Airports. The list will also be available as a PDF on the bottom of the FAA Digital Products, “Terminal Procedures Basic Search” page: http://www.faa.gov/air_traffic/flight_info/aeronav/digital_products/dtpp/search/
A symbol will be placed on the approach plates for the restricted airport. The symbol indicates a cold temperature altitude correction is required on this approach when reported temperature is at or below the published temperature. The list should be reviewed to determine which segment or segments of the approach require an altitude correction. Some airports may have two temperature restrictions. Temperatures for Cold Temperature Restricted Airports are completely separate from the temperatures published on RNAV approaches. Temperature restrictions on RNAV approaches must be followed, even if warmer than the temperature listed with the snowflake symbol.
New verbiage will also be found throughout the AIM regarding Cold Temperature Altitude Corrections. Pilots must understand they are responsible for applying altitude corrections and advising ATC when these corrections are to be made. Advising ATC of altitude corrections in the final segment is not required. Air Traffic Control will not be responsible for making any altitude corrections and/or advising pilots that an altitude correction is required at the restricted airport.
Cold temperature altitude corrections are only required at the listed airports and only at or below the restricted temperature(s). Applying this procedure is not required at any airfield greater than 2500 feet that is not included on the Cold Temperature Restricted Airport list.
Recommended Actions: Operators of aircraft, directors of safety, directors of operations, chief pilots, dispatch supervisors, fractional ownership program managers and training managers should accomplish the following:
1. View Notice to Airmen Publication (NTAP) http://www.faa.gov/air_traffic/publications/notices/ Part 4.
Graphic Notices, Section 1. General - Cold Temperature Restricted Airports.
2. Understand the procedures required at Cold Temperature Restricted Airports.
Contact: Questions or comments should be directed to Kel Christianson, Aviation Safety Inspector, AFS-470 at (202) 267-8838.
typhoonpilot
Well-Known Member
I've worked for foreign operators for the last 13+ years. We've always made corrections starting at a threshold temperature of 0 degrees C. The only exception is approaches with a published temperature range.
TP
TP
z987k
Well-Known Member
Even to en-route altitudes and flight levels? Or you're just talking the approach segment?
typhoonpilot
Well-Known Member
0 degrees C or colder: Corrections to published minimums as well as minimum safe and minimum obstruction clearance altitudes
-30C or colder = To all approach procedure altitudes (Procedure turn, intermediate fix, FAF, DA, and missed approach altitude)*
* In a number of regions radar vector altitudes are already temperature compensated by ATC
Typhoonpilot
seagull
Well-Known Member
I wonder if that is a specific browser? Anybody else have an issue with it?
BarbieDreamPilot
homeless
It was fine with Safari, Chrome, and Firefox.
skyrunner1500
Well-Known Member
If it's warmer than -15 degrees C, a good approximate correction is increasing the heights by 4% for every 10 deg. C below standard. For colder temperatures, using published tables is more safe.
We also usually start to adjust at 0 degrees C, but adjust all approach altitudes, as well as the flight path angle, depending on the approach type.
ATC is usually well aware in mountainous areas and/or areas where very cold temperatures are common and clear you to different initial altitudes, at least in Europe.
