או קי אני רואה שיש הרבה שאלות אז בואו
נעשה סדר: So let’s start talking about ground icing: But before I will do that lets clear 2 things: De-Ice: remove ice that already accumulated on the aircraft airframe Anti-Ice: to protect the aircraft airframe from Ice that would adhere to it . The accumulation of frost snow and other precipitation under freezing condition require us pilots a great deal of attention. Ground icing is being performed by ground crews when ground icing is anticipated. Ground icing is accomplished by using ground equipment that spray material that called: Glycol-based liquid. That martial is sprayed on the airframe of the aircraft. This liquid can be categorized into 3 types: Type I: low viscosity. Orange or pink colors, limited anti-icing effects, and being used usually for ice and snow removal. That’s is also what you see in the picture, that morning the sky were clear and we only had some frost over the wings, so we only had to use type one. Type II: this type is more thick-i.e. high viscosity, this type is almost like type I but because he is more thick it sticks to the airframe for several minutes, and by doing that its providing anti-ice capability. The color of this fluid is amber. Type IV: is basically an improve type II. Its main benefit is ant-icing effectiveness when applied to the airframe the extra thickness may cause the fluid to appear wavy or bumpy. The color of this fluid is pale green. Now in the airlines we use the FAA criteria for determine how long the anti-ice fluid will prevent the formation of snow or ice on the aircraft surface during taxi to take off and this time called :Hold over time. Basically what we have is a chart that has the type of fluid we use, the temperature out side, and the type of precipitation, and by using this chart we can determine if we can still T/O without having any frozen surface on our aircraft. Holdover time begins when the final application of the fluid starts and expires and loses its effectiveness. Now there is what we called a pre T/O inspection: if the aircraft will cross the hold short line within the holdover time guidelines and icing condition still exist, then a visual inspection by the flight crew from the flight deck must be made, like wings or windshield wipers. Not done yet my dear friends we also have a pre T/O contamination inspection: if the aircraft will cross the hold short line outside the holdover time guidelines and icing conditions still exist then a pre T/O contamination inspection must be made, and that could be accomplish by walking through the cabin and look at the wings. After this check we have 5 min to cross the hold short line. Now I know I just named type I II and IV, and I skipped type III , but I cannot remember why they got rid of it, but I will get the answer for that and will let you know.