28-01-00
AMM
% 3. Operation
% A. Normal Operation
% The engine pumps take fuel from the left fuel tank. Fuel flows through the finger filter to the % emergency fuel valve. From the valve it flows through the strainer in the gascolator. The % gascolator is also a water separator. The fuel flows to the main filter and the engine fuel system.
% The engine fuel pumps always supply more fuel than the fuel injection system can use. The % unwanted fuel is hot. It flows back to the right fuel tank and though the cooling loop. Heat transfers % from the return fuel to the cold fuel in the tank. The return fuel flows from the cooling loop to the % left tank. The return fuel mixes with the fuel in the left tank.
% This process keeps the Diesel fuel warm in both tanks when the airplane operates in cold % conditions.
% As the engine uses fuel, the fuel level in the left tank decreases. Air flows in through the vent % system to fill the space left by the fuel. This prevents the tank pressure from decreasing to less % than atmospheric pressure. It allows the engine pumps to continue to take fuel from the tank.
% B. Fuel Transfer
% As the engine uses fuel, the fuel level in the left tank decreases. The fuel level in the right tank % does not change. To balance the tank contents, the electric transfer pump moves fuel from the % right tank to the left tank. It is operated through a switch (marked FUEL TRANS .) on the left of % the instrument panel. A status light (FUEL TRANS) on the annunciator panel is illuminated as long % as the fuel transfer pump is running.
% The high fuel sensor in the left tank outer top corner automatically switches off the fuel transfer % pump when the fuel level is high in the left tank. The low fuel sensor in the right tank inner bottom % corner automatically switches off the fuel transfer pump when the fuel level is low in the right tank.
% C. Emergency Operation
% In an emergency (for example, the transfer pump fails) you can set the emergency fuel valve to % connect the right tank transfer line to the fuel supply line. This is the EMERGENCY setting. The % engine takes fuel from the right tank. However, the return fuel still flows through the cooling loop % to the left tank. As fuel is used from the right tank, the level of fuel in the left tank will slowly % increase.
Page 4 Doc # 6.02.01 09 Jan 2003 Rev. 4
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本文链接地址:钻石40飞机维护手册 DA 40 SERIES AMM 3(30)