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塞斯纳172飞行员操作手册 Cessna 172 PILOT'S OPERATING HANDBOOK(20)

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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After an engine failure in flight, the best glide speed as shown in figure 3-1 should be established as quickly as possible. While gliding toward a suitable landing area, an effort should be made to identify the cause of the failure. If time permits, an engine restart should be attempted as shown in the checklist. If the engine cannot be restarted, a forced landing without power must be completed.

0 2 4 6 8 10 12 14 16 18 20
GROUND DISTANCE - NAUTICAL MILES
Figure 3-1. Maximum Glide
 
FORCED LANDINGS
If all attempts to restart the engine fail and a forced landing is imminent, select a suitable field and prepare for the landing as discussed under the Emergency Landing Without Engine Power checklist.
Before attempting an "off airport" landing with engine power availa• ble, one should fly over the landing area at a safe but low altitude to inspect the terrain for obstructions and surface conditions, proceeding as dis. cussed under the Precautionary Landing With Engine Power checklist.
Prepare for ditching by securing or jettisoning heavy objects located in the baggage area and collect folded coats for protection of occupants' face at touchdown. Transmit Mayday message on 121.5 MHz giving location and intentions. Avoid a landing flare because of difficulty in judging height over a water surface.
LANDING WITHOUT ELEVATOR CONTROL
Trim for horizontal flight (with an airspeed of approximately 60 KIAS and flaps set to 20°) by using throttle and elevator trim controls. Then do not change the elevator trim control setting; control the glide angle by adjusting power exclusively.
At flareout, the nose-down moment resulting from power reduction is an adverse factor and the airplane may hit on the nose wheel. Consequent¬ly, at flareout, the elevator trim control should be adjusted toward the full nose-up position and the power adjusted so that the airplane will rotate to the horizontal attitude for touchdown. Close the throttle at touchdown.
 
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