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塞斯纳172飞行员操作手册 Cessna 172 PILOT'S OPERATING HANDBOOK(31)

时间:2011-12-29 11:03来源:蓝天飞行翻译 作者:航空 点击:

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AMPLIFIED PROCEDURES STARTING ENGINE
During engine starting, open the throttle approximately 1/ 8 inch. In warm temperatures, one or two strokes of the primer should be sufficient. In cold weather, up to six strokes of the primer may be necessary. If the engine is warm, no priming will be required. In extremely cold tempera¬tures, it may be necessary to continue priming while cranking the engine.
Weak intermittent firing followed by puffs of black smoke from the exhaust stack indicates overpriming or flooding. Excess fuel can be cleared from the combustion chambers by the following procedure: set the mixture control full lean and the throttle full open; then crank the engine through several revolutions with the starter. Repeat the starting proce¬dure without any additional priming.
If the engine is underprimed (most likely in cold weather with a cold engine) it will not fire at all, and additional priming will be necessary. As soon as the cylinders begin to fire, open the throttle slightly to keep it running.
After starting, if the oil gage does not begin to show pressure within 30 seconds in the summertime and about twice that long in very cold weather, stop engine and investigate. Lack of oil pressure can cause serious engine damage. After starting, avoid the use of carburetor heat unless icing conditions prevail.
NOTE
Additional details concerning cold weather starting and operation may be found under COLD WEATHER OPERA¬TION paragraphs in this section.
TAXIING
When taxiing, it is important that speed and use of brakes be held to a minimum and that all controls be utilized (see Taxiing Diagram, figure 4¬2) to maintain directional control and balance. Taxiing over loose gravel or cinders should be done at low engine speed to avoid abrasion and stone damage to the propeller tips.
The carburetor heat control knob should be pushed full in during all ground operations unless heat is absolutely necessary. When the knob is Pulled out to the heat position, air entering the engine is not filtered.
 
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