时间：2011-03-11 23:13来源：蓝天飞行翻译 作者：admin 点击：次
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mallet. A type of hammer whose head has the shape of a cylinder. Mallet heads are usually made of a soft material such as wood, plastic, fiber, leather, or a soft metal, such as brass or lead. mandatory altitude (air traffic control). An altitude depicted on an Instrument Approach Procedure Chart requiring the aircraft to maintain altitude at the depicted value. mandrel (machine tool). A tapered shaft or spindle that fits into a hole. A mandrel is used to support and center a device or piece of material so it can be machined in a lathe or balanced on a balancing machine. mandrel (tube bending machine). A long steel rod with a rounded end that is inserted into a piece of thin-wall metal tubing when it is being bent in a tube-bending machine. The rounded end of the rod is held at the point the bend is started to keep the tubing from flattening as it is bent. mandrel (propeller balancing component). A precision steel bar on which a propeller is mounted for balancing. The mandrel is placed across two perfectly level knife-edge plates and the propeller is allowed to rotate until it stops with its heavy point at the bottom. manganese. A silvery, brittle, metallic chemical element. Manganese’s symbol is Mn, its atomic number is 25, and its atomic weight is 54.938. Manganese is used as an alloy for steel to increase its strength, hardness, and wear resistance. manganese dioxide. A chemical compound used as a depolarizer in carbon-zinc batteries. Hydrogen gas forms in bubbles on the carbon rod when electrons flow to it from the zinc can. If these bubbles are allowed to remain on the rod, they will insulate it from the electrolyte and shut off the flow of electrons. Manganese dioxide absorbs the hydrogen gas, allowing the electrolyte to remain in contact with the carbon rod and keep the electrons flowing. Manganin. The registered trade name for an alloy of copper, manganese, and nickel. Manganin is used for wire-wound resistors because its resistance changes very little as its temperature changes. manifold absolute pressure. See MAP. manifold (hydraulic system component). The portions of an aircraft hydraulic system to which the selector valves are connected. Selector valves receive pressurized fluid from the pressure manifold and route return fluid from the actuators to the return manifold and then to the reservoir. manifold (reciprocating engine exhaust system component). A chamber connected to the exhaust ports on the cylinders of an engine. All the cylinders empty their exhaust gases into the manifold from which they are carried overboard through the muffler and tail pipe. manifold cross-feed fuel system. A type of fuel system commonly used in large transport-category aircraft. All fuel tanks feed into a common manifold, and the dump chutes and the single-point fueling valves are connected to the manifold. Fuel lines to each engine are taken from the manifold. manifold pressure. 14 CFR Part 1: “Absolute pressure as measured at the appropriate point in the induction system and usually expressed in inches of mercury.” |
