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#1
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The pigs will be flying long before there is a 5F day at OAK.
Mike MU-2 "Fred E. Pate" wrote in message ... John Bell wrote: Let me add two links to the discussion: This is on problems with cold weather altimetry: http://www.aircraftbuyer.com/learn/train06.htm This is about the accuracy of unaided GPS altitude in the context of vertical guidance, but it bears some relavence to the discussion of the accuracy of GPS altitude: http://www.bluecoat.org/reports/Graham_2001_RawGPS.pdf John Bell www.cockpitgps.com This one's for the Canadians on this thread. A notice on the new Oakland, California (KOAK) "RNAV (GPS) RWY 29" approach (http://www.myairplane.com/databases/.../OAK_agr29.pdf): "BARO-VNAV NA below -15 deg C (5 deg F)" And this is for a decision altitude of only 294 ft AGL. Seems like the FAA is moving towards taking into account temperature errors in barometric alitmetry. And, by implication, this supports the premise that WAAS altitude figures are more accurate than the trusty old "sensitive altimeter." (In the legend they specifically state that WAAS-based VNAV can be used when BARO-VNAV is not approved due to temperature.) |
#2
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Sure, but that's not tne point. These restrictions will be standard on all of these types of approaches nation wide. Its the first time I am aware of that the FAA has included temperature altimetry errors in instrument procedures.
Mike Rapoport wrote: The pigs will be flying long before there is a 5F day at OAK. Mike MU-2 "Fred E. Pate" wrote in message ... John Bell wrote: Let me add two links to the discussion: This is on problems with cold weather altimetry: http://www.aircraftbuyer.com/learn/train06.htm This is about the accuracy of unaided GPS altitude in the context of vertical guidance, but it bears some relavence to the discussion of the accuracy of GPS altitude: http://www.bluecoat.org/reports/Graham_2001_RawGPS.pdf John Bell www.cockpitgps.com This one's for the Canadians on this thread. A notice on the new Oakland, California (KOAK) "RNAV (GPS) RWY 29" approach (http://www.myairplane.com/databases/.../OAK_agr29.pdf): "BARO-VNAV NA below -15 deg C (5 deg F)" And this is for a decision altitude of only 294 ft AGL. Seems like the FAA is moving towards taking into account temperature errors in barometric alitmetry. And, by implication, this supports the premise that WAAS altitude figures are more accurate than the trusty old "sensitive altimeter." (In the legend they specifically state that WAAS-based VNAV can be used when BARO-VNAV is not approved due to temperature.) |
#3
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I agree in principle but in actuality it never gets cold enough in the US to
make a difference. The only times that we have really low temperatures (-40 and below) there is an inversion. Mike MU-2 wrote in message ... Sure, but that's not tne point. These restrictions will be standard on all of these types of approaches nation wide. Its the first time I am aware of that the FAA has included temperature altimetry errors in instrument procedures. Mike Rapoport wrote: The pigs will be flying long before there is a 5F day at OAK. Mike MU-2 "Fred E. Pate" wrote in message ... John Bell wrote: Let me add two links to the discussion: This is on problems with cold weather altimetry: http://www.aircraftbuyer.com/learn/train06.htm This is about the accuracy of unaided GPS altitude in the context of vertical guidance, but it bears some relavence to the discussion of the accuracy of GPS altitude: http://www.bluecoat.org/reports/Graham_2001_RawGPS.pdf John Bell www.cockpitgps.com This one's for the Canadians on this thread. A notice on the new Oakland, California (KOAK) "RNAV (GPS) RWY 29" approach (http://www.myairplane.com/databases/.../OAK_agr29.pdf): "BARO-VNAV NA below -15 deg C (5 deg F)" And this is for a decision altitude of only 294 ft AGL. Seems like the FAA is moving towards taking into account temperature errors in barometric alitmetry. And, by implication, this supports the premise that WAAS altitude figures are more accurate than the trusty old "sensitive altimeter." (In the legend they specifically state that WAAS-based VNAV can be used when BARO-VNAV is not approved due to temperature.) |
#4
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Mike Rapoport wrote:
The pigs will be flying long before there is a 5F day at OAK. Mike MU-2 Oh yeah, I forgot to add that those pigs will be using WAAS and LAAS equipment to make their approaches into Oakland when it happens |
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