Accelerate-Stop Distance Question

[Michael25nc]

For the Pilots of the Group:

Suppose you have a runway that is 9300 feet long. This runway is constrained on both ends due to housing developments, roads etc., barring any form of runway extension, unless of course the airport buys up the neighborhood land or diverts the road (think Chicago Midway). This also means that the runway does not have the required Runway Safety Area at the end because of these constraints. In order to have the required Runway Safety Area of 1000 feet beyond the runway, it has been proposed to reduce the Accelerate-Stop Distance Available by 1000 feet, making the runway 8300 feet for take-off calculations. Now the question is this: As a pilot, do you base your Go/No Go decision to use that runway based on the ASDA (8300
feet) or the Take-off Distance Available (TODA)/Take-off Run Available (TORA)? (9300 feet)

In other words, is the Accelerate-Stop Distance (ASDA) the limiting factor for take off..or would you continue to use TODA/TORA for your takeoff calculations?

Any insight you can provide would be great!

 

[BoeingBoy]

Assuming that the usable runway for takeoff was officially shortened - the official length becomes 8300 ft - then that is the length that is used for all calculations. To do otherwise would just negate the improved safety margin that the RSA was intended to provide.

Look at it this way - a 5000 ft runway that has 3000 ft of open field beyond the end as a safety area. You wouldn't base your takeoff calculations, including accelerate/stop, on having 8000 ft of "runway" available.

Jim