SRobertson Posted February 5, 2011 Report Share Posted February 5, 2011 Hi all... This topic is for anyone to share knowledge of arctic flying. Steve Quote Link to comment Share on other sites More sharing options...
SRobertson Posted February 5, 2011 Author Report Share Posted February 5, 2011 APPLIED TEMPERATURE CORRECTION: I flew the other day (VFR) and was in the old situation of low pressure and temperature combined with flying into higher terrain. I thought it would be good to write about the realities of this as opposed to just reading about it on an IFR exam. I thought it would be a good example of real altitude change due to cold and low pressure situations while flying in the arctic. Route was from a Sea Level location (40 feet) to an 1100' destination. Altimeter was 29.42. Temperature was -30C. Flew out and back at about FL030. At FL021 (the original plan), we would be at 1000' above highest obstacle enroute...maybe. The real altitude (confirmed by RADALT) for experimental purposes will be much different. Please follow: QNE for enroute is 29.92 - 29.42 (QNH) = 500 feet lower also subtract about 200' lower for temperature correction (CAP GEN pg 27). Therefore, at FL 021, the real RADALT altitide (height) over destination is 300 feet. The old saying: COLD and LOW - LOOK OUT BELOW came in handy here. |hope this is useful. Fly Safe. Steve Quote Link to comment Share on other sites More sharing options...
FREDDIE Posted February 6, 2011 Report Share Posted February 6, 2011 Try finding a sun chart for setting your DG. I cannot remember off hand how to do it all something about turning towards the sun and lining the shadow up on the broom closet check the time then set your DG from the chart. Age is a bad thing some of the details are fuzzy now If I can find the chart in my old stuff I will post it. Quote Link to comment Share on other sites More sharing options...
FREDDIE Posted February 6, 2011 Report Share Posted February 6, 2011 Here is a link to the sun charts http://www.mysundial.ca/tsp/sun_charts.html Have fun they are a great navigation skill if you lose your GPS Quote Link to comment Share on other sites More sharing options...
sharkbait Posted February 6, 2011 Report Share Posted February 6, 2011 http://shop.tc.gc.ca/TChtml/ibeCCtpItmDspRte.jsp?item=40663&language=US This is what I used. Quote Link to comment Share on other sites More sharing options...
hybrid Posted February 6, 2011 Report Share Posted February 6, 2011 Another big debate is, at what temperature does icing cease in cloud. I have seen it form as low as -20, have been told that it won't form in cloud much below that. Would be interested in hearing opinions from some seasoned arctic IFR pilots? Quote Link to comment Share on other sites More sharing options...
SRobertson Posted February 7, 2011 Author Report Share Posted February 7, 2011 Try finding a sun chart for setting your DG. I cannot remember off hand how to do it all something about turning towards the sun and lining the shadow up on the broom closet check the time then set your DG from the chart. Age is a bad thing some of the details are fuzzy now If I can find the chart in my old stuff I will post it. Thank goodness for GPS. We use the DG and line it up on the GPS track or traditional navaid if its available. I usually have to re-align every 15-20 minutes to the GPS track. The company has installed dual GPS which I think is a great idea since your alternates are so far apart and going off in the wrong direction is NOT an option. Quote Link to comment Share on other sites More sharing options...
SRobertson Posted February 7, 2011 Author Report Share Posted February 7, 2011 Another big debate is, at what temperature does icing cease in cloud. I have seen it form as low as -20, have been told that it won't form in cloud much below that. Would be interested in hearing opinions from some seasoned arctic IFR pilots? I prefer not to test the theory. From my experience, ice crystals won't ice you up, but they will adversely affect visibility; especially when combined with blowing snow and/or darkness. However, ice fog or BR seems to occur at below -20 (seen it at -30). I definitely don't want to go into it as its water molecules still and my aircraft is incapable of handling it. There seems to be allot more open cracks in the ocean now than what I have heard of in the past. These seem to contribute to more moisture, sea smoke rising causing BR / FG conditions at colder than -20 temperatures. Therefore icing conditions will exist in that below -20. Great comments, would like to hear other opinions or experience. Quote Link to comment Share on other sites More sharing options...
SRobertson Posted February 8, 2011 Author Report Share Posted February 8, 2011 Just to add: I happened to be at a place that has just posted this strip: Note the temperature and the condition. 1700Z 33010KT 1/4SM -SN +BLSN FZFG OVC130 M25/M29 A2931 REBLSN RMK BLSN4AC4 SLP926 Quote Link to comment Share on other sites More sharing options...
hybrid Posted February 8, 2011 Report Share Posted February 8, 2011 Just to add: I happened to be at a place that has just posted this strip: Note the temperature and the condition. 1700Z 33010KT 1/4SM -SN +BLSN FZFG OVC130 M25/M29 A2931 REBLSN RMK BLSN4AC4 SLP926 Interesting for sure. Is that near sea level? Usually you wouldn't have open water at those temps, but I have seen some this year in tidal water when the ice is shifting. I am interested to see what the coldest temperature that anyone has picked up ice in cloud (at altitude), enough to be a major concern? Quote Link to comment Share on other sites More sharing options...
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