Ybacpa From United States of America, joined Feb 2001, 1108 posts, RR: 1 Posted (10 years 8 months 3 days 12 hours ago) and read 7766 times:
Yesterday (April 7), on my flight to Houston (CO 51), due to the unexpected snow in the New York area, we had to do a deicing. One thing I noticed during the deicing was it appeared that when the fluid was sprayed onto a plane (both the wing of mine, and some of the others in the immediate area), it appeared to change to a dark pink / red upon contact with the fuselage / wing. From what I could tell this occured near areas where ice or snow were present.
So, for my question: Does deicing fluid actually change color to indicate the presence of ice, or was this just some sort of optical illusion, or unrelated side effect?
Also, Newark has an open air hanger that was originally built to deice aircraft, but it doesn't appear that it is ever in use when deicing is necessary. Does anyone know if it is ever used, or why it is no longer used?
Thanks in advance for any information.
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NKP S2 From United States of America, joined Dec 1999, 1714 posts, RR: 5 Reply 2, posted (10 years 8 months 3 days 7 hours ago) and read 7703 times:
De-icing/anti -ice fluid, "Type 1" ( propylene glycol ) is pink-ish and sprayed on hot...and is used for ice removal and nominal anti-ice capability.
Anti-ice fluid Type 4, ( if used ) is slime green and sprayed on at relative ambient temperatures ( although heat transfer from the adjacent Type 1 tank in the truck will probably raise this temp via osmosis ), and is used ONLY for anti-icing. It greatly increases hold-over times while precipitation is present.
NKP S2 From United States of America, joined Dec 1999, 1714 posts, RR: 5 Reply 6, posted (10 years 8 months 1 day 5 hours ago) and read 7516 times:
Temperature will decide which glycol/water mix will be used for anti/de-icing ratio of Type 1. Anywhere from 10/90 to a maximum of 60/40.
Type 4, since it is shot at 100%, is generally used only when there is precipitation that would unduly shorten hold-over times...and only on wings and horizontal stabs. I say "generally" due to the fact some use it as a preventive measure on A/C parked overnight where precipitation is forcast...apply it to a clean A/C so that it makes an easier job of de-icing later, or the next day/morning before it flies again. It can really help: A plane sittiing, cold soaked, in blowing, freezing rain for hours and hours can really get some thick ice on it, and can take a full 30 minutes or more to de-ice...using up a sh!tload of Type 1.