时间：2011-03-11 23:11来源：蓝天飞行翻译 作者：admin 点击：次
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When the air inside the cylinder is dry, the indicator dye is blue, but if moisture gets into the cylinder, it is absorbed by the silica gel, and the indicator changes its color to pink. deicer. A system or component used to remove ice from a surface. Deicers must not be confused with anti-icers, which prevent the formation of ice. Deicers remove ice after it has formed. deicer boots (aircraft deicing component). Inflatable rubber boots attached to the leading edges of the wings and empennage of an airplane. Compressed air is pumped into tubes in the boots to inflate them in a timed sequence. Ice is allowed to form over these boots while they are deflated, and when they inflate, they break the ice from the surface, and the airflow carries it away. deicing fluid. A fluid that is heated and sprayed onto an aircraft being prepared for takeoff in conditions of freezing temperature and snow. Most deicing fluids contain a form of glycol, with thickeners added to hold the glycol to the surface. These fluids remove the ice and then stick to the surface and prevent the formation of more ice. deka, or deca. The metric prefix that means ten. The prefix deka or deca is often used before such terms as meter (dekameter, or decameter) or liter (dekaliter, or decaliter). delamination. A separation of the layers of a laminated material. Plywood is made up of layers, or laminations, of wood glued together. When the glue weakens, the layers can separate and the plywood is said to be delaminated. Delamination of bonded composite materials causes the materials to lose strength. “Delay indefinite [reason, if known] expect further clearance [time]” (air traffic control). A phrase used by ATC to inform a pilot when an accurate estimate of the delay time and the reason for the delay cannot immediately be determined. Such delays could be a disabled aircraft on the runway, terminal or center area saturation, or weather below landing minimums. delay time (air traffic control). The amount of time an arriving aircraft must lose to cross the meter fix at the assigned meter fix time. This is the difference between actual calculated landing time (ACLT) and the vertex time of arrival (VTA). delivery air duct check valve (pressurization system component). An isolation valve at the discharge side of the air turbine that prevents the loss of cabin pressurization through a disengaged cabin air compressor. delta (Δ). One of the Greek letters which has a common usage in technology to mean a change in something. A small change is indicated by the lower-case letter delta (δ), and a larger change is shown by the use of a triangle, the upper-case letter delta (Δ). delta airplane. An airplane with a triangular-shaped wing. A delta wing has an extreme amount of sweepback on its leading edge and a trailing edge that is almost perpendicular to the longitudinal axis of the airplane. Δ CG (delta CG). A change in the center of gravity of an aircraft. |
