Provided by FlightSafety International

Which components are typically used in certification of a turbojet aircraft to determine the accelerate-stop distance during takeoff?

A. Wheel brakes

B. Wheel brakes, lift-dumping devices (spoilers or speed brakes)

C. Wheel brakes, lift-dump devices (spoilers or speed brakes) and thrust reversers

D. Wheel brakes, lift-dump devices (spoilers or speed brakes) and thrust reversers or drag chutes

 

Correct answer: B

During the certification of most aircraft, thrust reversers or drag chutes are not allowed during accelerate-stop distance calculation and measurement.  The accelerate-stop distances are measured with up to 90 percent brake wear, all lift-dumping devices (spoilers or speed brakes) activated, properly inflated tires and maximum force applied to the brakes until the aircraft comes to a complete stop. Great judgment must be exercised when aborting a takeoff for a blown tire or tires because accelerate-stop distances are not measured with one or more failed tires.