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Lesson 8 背景知识选择-2There are three categories of instrument approach procedures:_with course and glide path guidance ,approach with vertical guidance(APV), and __without glide path information

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Lesson 8 背景知识选择-3Fuel dumping(or afuel jettison) is a procedure used by aircraft to ____in certain _ situationswhen they have to for landing shortly after takeoff or they have to land_____ of the intended destination airport.

Lesson 8 背景知识选择-4Fuel-dumping operations are ____withair traffic control, and precautions are taken to keep other aircraft _ of such areas. Fuel dumping is usually accomplished at a high enough altitude (minimum 6,000 feet,AGL), where the fuel will ______before reaching the ground.

Lesson 8 背景知识选择-5In the event of an emergency requiring a return to the departure airport, the aircraft without fuel dump systems have to _ （盘旋）nearby in order to consume fuel to get down to within the maximum structural landing weight limit, or, if the situation demands, simply lands (超重）without delay

Lesson 8 背景知识填空－６If an aircraft lands at more than its maximum allowable weight, it might suffer ________（结构受损） or even break apart（解体） on landing.