The use of a fluid with a viscosity above its MOWV indicates that its LOUT has not been established. The temperature resulting from the aerodynamic acceptance test (AAT) in AS5900, whichever is warmer.įor EG106, this is the same temperature as its freezing point is -36☌ and the AAT temperature is -29☌.The freezing point of the AAF + a 7☌ buffer or.The LOUT of this AAF was established as the warmer temperature of either: The LOUT of EG106 may be impacted due to viscosities higher than its MOWV. To fully utilize a holdover timetable, an AAF must have a viscosity that is above its lowest on-wing viscosity (LOWV) to achieve an adequate holdover time while also having a viscosity below the MOWV to ensure that the fluid can be used down to its lowest operational use temperature (LOUT). The HOT Guidelines contain tables with time ranges for the use of many AAFs. The HOT Guidelines, developed and published annually by TC, are based on the Society of Automotive Engineers (SAE) Aerospace Recommended Practice (ARP)5718B - Qualifications Required for SAE Type II/III/IV Aircraft Deicing/Anti-Icing Fluid. There are no regulatory requirements for fluid manufacturers or service providers within the CARs. TC implements the Canadian Aviation Regulations (CARs) 602.11 – Aircraft Icing which prescribes operator ground icing requirements, including those pertaining to the use of the Holdover Time (HOT) Guidelines through Standard 622.11 - Ground Icing Operations. Canadian Aviation Regulations (CARs) 602.11 – Aircraft Icing However, DOW informed TC that the batch viscosities have ranged between 48,000 and 52,500 mPa-s.ĭOW advised its customers of the product's inconsistency and provided a "No Technical Objection" (NTO) allowing its continued use. The shipments from the 6 production batches were delivered to the following stations: Background:ĭOW, an AAF manufacturer, recently advised TC that six (6) production batches of their (AAF) named UCAR ENDURANCE EG106 ADF/AAF (also known as EG106) had viscosity measurements that tested above its specified MOWV in the product information guidance (UCAR ENDURANCE EG106 Ethylene Glycol Type IV Aircraft Deicing/Anti-Icing Fluid). This CASA serves as an awareness tool to all stakeholders with recommended measures to minimize safety risks for air operations in ground icing conditions. Transport Canada (TC) was recently made aware that an aircraft deicing/anti-icing fluid (AAF) produced by DOW Chemical (DOW) was distributed throughout numerous stations within Canada and could have viscosity measurements higher than its specified maximum on-wing viscosity (MOWV). All operators and de/anti-icing service providers File Classification No.:
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