De-ice technology develops

De-ice Technology Develops New systems you can bet your boots on By Greg Napert October 1998 There are three basic types of ice prevention systems that have been in common use over the years: The rubber bladder type — typically...

Fluid weight depends entirely on the quantity carried. At a weight of 9.2 pounds per gallon, fluid weight falls in the range of 55 to 70 pounds. This weight can, however, be eliminated in non-icing seasons by draining the fluid tank or not replenishing it.

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Handling, Servicing, and Maintenance
Prolonged out of Service Care During Flyable Storage Ensure that the de-icing fluid tank contains at least the minimum take off quantity of fluid (1 gallon), and that all system components are filled with fluid. If necessary, operate pump(s) until all air is dispelled from components and pipelines (see Priming, below). Recheck tank contents.

1. De-icing Fluid Tank (See Limitations for specified de-icing fluids). The filler cap is located on the right fuselage aft of the baggage compartment. To preclude the possibility of contaminated fluid, always clean the top of fluid containers before dispensing, and if required, maintain a clean, measuring vessel solely for de-icing fluid. Secure the filler cap immediately after filling. The tank is vented through the filler cap and an additional vent line is provided.
2. Ice Protection Fluid Strainer Ordinarily, the de-icing fluid strainer in the fluid tank outlet should not require cleaning, unless there is a definite indication of foreign matter in the tank.
3. Ice Protection Fluid Filter

Illumination of the HIGH PRESSURE warning in flight (or during ground testing) indicates the need for filter element renewal. Warnings arising from system operation in the MAXIMUM flow mode and/or at abnormally low temperatures (below -30ûC, -22ûF) may be ignored. 4. Pump Priming

The airframe/propeller pumps may not be self priming, and are primed, when required, by operation of the corresponding windshield pump. Windshield pump 1 primes main pump 1, and windshield pump 2 will prime main pump 2.

Porous panels contain a plastic membrane which may be damaged by certain solvents, particularly Methyl Ethyl Ketone, lacquer thinner, and other types of thinners. Mask panels when painting aircraft or when using solvents for other purposes in the proximity of the porous panels.

Only the solvents listed in the Limitations are permitted for use on porous panels. The porous panels may be washed with mild soap and water using a brush or cloth.

Ice Protection Fluid
The active element of any TKS system is the antifreeze solution. In most instances, three fluids have been approved for use in TKS systems certified in the United States, but only one is typically used. This fluid is commonly known as AL-5, manufactured to the British specification DTD 406B.

DTD 406B is a relatively simple mixture consisting of 3 parts: 85 percent ethylene glycol, 5 percent isopropyl alcohol, and 10 percent de-ionized water by volume. The fluid weighs 9.2 pounds per gallon. Simple as it is, the fluid is well filtered before distribution to remove even the smallest contaminants that could adversely affect the operation of a TKS system. The fluid is available from a number of manufacturers in the U.S. and is readily available at a number of fixed-base operators throughout the country.

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