一种通用航空飞机半主动起落架控制的试验。
Test of Semiactive Landing Gear Control For a General Aviation Aircraft.
全球大约有34万架通用航空飞机，其中70%为美国所有。
Globally there are approximately 340, 000 GA aircraft, of which the US accounts for about 70 per cent.
事发空域是一个非常繁忙的通用航空走廊，天气晴好的时候那里的观光飞机络绎不绝。
The accident happened in a busy general aviation corridor over the river that is often filled with sightseeing craft on sunny days.
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