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When snow hits, Metro is ready! Due to this weekend’s forecast, planned track work has been canceled. As we continue to monitor & prepare for a winter storm, check out our deicer trains which spray anti-icing fluid on the third rail to help keep you moving when temps drop! 🚇❄️

36,565 Aufrufe • vor 6 Monaten •via X (Twitter)

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The difference between de-icing and anti-icing ❄️✈️ Pilots are required to ensure that the wings and all control surfaces are clear of any form of frozen contamination. Even small amounts of ice on the wing can significantly reduce its lift capability as well as the stalling angle of attack. De-icing fluid is used when the aircraft is contaminated with snow or ice which needs to be removed, but no further freezing precipitation is expected before departure. This can be accompanied by spraying heated fluid onto the aircraft to remove the contamination. If protection from further frozen contamination buildup is required, such as when it’s snowing, we then spray a second fluid over the clean wing, which adheres to the wing and prevents the buildup for a period of time. This time of protection is called the ‘holdover time’ Pilots calculate the holdover time for the fluid used by using tables and entering the fluid type, concentration, type of precipitation and temperature. As a general rule, the higher the number of the fluid used, the longer the holdover time. Eg Type 2 fluid offers a shorter holdover time than Type 4. The fluids can also be diluted to offer varying levels of protection. Eg 75/25 - This means that the mixture being used consists of 75% de-icing fluid and 25% water. The longest holdover time is achieved by using 100% fluid but this can be less environmentally friendly and very expensive. So if we can achieve the desired holdover time with a lower dilution, we can enhance the efficiency of the operation. 📸 by ig/airlinepilotperformance , iarild

aircraftmaintenancengineer

72,064 Aufrufe • vor 8 Monaten