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To view this page ensure that Adobe Flash Player version 9.0.124 or greater is installed. FIRES Although engine fires are extremely rare in flight, the steps of the appropriate checklist should be followed if one is encountered. After completion of this procedure, execute a forced landing. Do not attempt to restart the engine. The initial indication of an electrical fire is usually the odor of burning insulation. The checklist for this problem should result in elimination of the fire. EMERGENCY OPERATION IN CLOUDS (Vacuum System Failure) In the event of a vacuum system failure during flight, the directional indicator and attitude indicator will be disabled, and the pilot will have to rely on the turn coordinator if he inadvertently flies into clouds. The following instructions assume that only the electrically-powered turn coordinator is operative, and that the pilot is not completely proficient in instrument flying. EXECUTING A 180° TURN IN CLOUDS Upon inadvertently entering the clouds, an immediate plan should be made to turn back as follows: 1. Note the compass heading. 2. Note the time of the minute hand and observe the position of the sweep second hand on the clock. 3. When the sweep second hand indicates the nearest half-minute, initiate a standard rate left turn, holding the turn coordinator symbolic airplane wing opposite the lower left index mark for 60 seconds. Then roll back to level flight by leveling the miniature airplane. 4. Check accuracy of the turn by observing the compass heading which should be the reciprocal of the original heading. 5. If necessary, adjust heading primarily with. skidding motions rather than rolling motions so that the compass will read more accurately. 6. Maintain altitude and airspeed by cautious application of elevator control. Avoid overcontrolling by keeping the hands off the control wheel as much as possible and steering only with rudder. EMERGENCY DESCENT THROUGH CLOUDS If conditions preclude reestablishment of VFR flight by a 180° turn, a descent through a cloud deck to VFR conditions may be appropriate. If possible, obtain radio clearance for an emergency descent through clouds. To guard against a spiral dive, choose an easterly or westerly heading to minimize compass card swings due to changing bank angles. In addition, keep hands off the control wheel and steer a straight course with rudder control by monitoring the turn coordinator. Occasionally check the Compass heading and make minor corrections to hold an approximate course. Before descending into the clouds, set up a stabilized let-down condition as follows: 中国通航网 www.ga.cn 通航翻译 www.aviation.cn 本文链接地址：塞斯纳172飞行员操作手册 Cessna 172 PILOT'S OPERATING HANDBOOK(21) |
