boctal Posted January 29, 2022 Report Share Posted January 29, 2022 I have ice accumulation on the wings in south Florida on the ground and the lowest temperature in the last 24 hours was 12C. The airframe was flown in to the airport yesterday. Coming from experience, you would never see ice form at that temperature. Yes, it can remain on the wing up to 10C if it was previously formed, but I've never seen it form on top of the wing unless it was "close" to the freezing point. Cold air can sink and cause surface frost while the air above remains above freezing, but again, it at least has to be close to the freezing point for that to happen. Quote Link to comment Share on other sites More sharing options...
richjb Posted January 29, 2022 Report Share Posted January 29, 2022 Are they perhaps modeling the effects of cold soaked fuel and wing icing? I would not put it past them given the level of detail here. Cold soaked wing fuel can cause icing on the wing surfaces exposed to the fuel tank at temperatures up to +10C. This has caused accidents, the most famous being the SAS MD 80 back in the 80's. If the wing surface temperature is near freezing due to cold soaked fuel, and the temp/dewpoint are close (I've seen guidance of 3 degree spread) then yes it is possible to get ice on top of the wing surface up to about +10C. Quote Link to comment Share on other sites More sharing options...
boctal Posted January 29, 2022 Author Report Share Posted January 29, 2022 (edited) 9 minutes ago, richjb said: Are they perhaps modeling the effects of cold soaked fuel and wing icing? I would not put it past them given the level of detail here. Cold soaked wing fuel can cause icing on the wing surfaces exposed to the fuel tank at temperatures up to +10C. This has caused accidents, the most famous being the SAS MD 80 back in the 80's. If the wing surface temperature is near freezing due to cold soaked fuel, and the temp/dewpoint are close (I've seen guidance of 3 degree spread) then yes it is possible to get ice on top of the wing surface up to about +10C. Cold soaked fuel icing is usually found (not always) on the underside of a wing. Even if they were simulating that, the fuel wouldn't have been cold soaked as the temperature on the ground never went below 12C and the aircraft had been on the ground for an extended period of time, so high altitude cold soaked fuel wouldn't have caused it either. Another aspect that I'm not sure could be simulated is how solar radiation can, fairly quickly, melt away frost via surface heating or cause sublimation, even below freezing. Edited January 29, 2022 by boctal Quote Link to comment Share on other sites More sharing options...
richjb Posted January 29, 2022 Report Share Posted January 29, 2022 26 minutes ago, boctal said: Cold soaked fuel icing is usually found (not always) on the underside of a wing. Even if they were simulating that, the fuel wouldn't have been cold soaked as the temperature on the ground never went below 12C and the aircraft had been on the ground for an extended period of time, so high altitude cold soaked fuel wouldn't have caused it either. Another aspect that I'm not sure could be simulated is how solar radiation can, fairly quickly, melt away frost via surface heating or cause sublimation, even below freezing. True, usually on the bottom, but can form on the top which is why the MD80s had heater blankets installed after the SAS accident. Our CL300/350 requires us to check for cold soaked fuel ice on top of the wing in certain conditions. However, you're correct that it's not likely in the conditions you describe. This add-on has amazed me with their level of detail, so nothing right now surprises me. Delights me...yes! Rich Boll 1 Quote Link to comment Share on other sites More sharing options...
Goran_M Posted January 29, 2022 Report Share Posted January 29, 2022 (edited) We'll look into it Edited January 30, 2022 by Goran_M 1 Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.