Hi, just a couple of questions regarding take-off requirements:
I'm reading through a performance book published in Aussie
The ASDA is stated that it must be the higher of:
- The distance required to accelerate to Vef, continue to accelerate to V1 + 2 seconds, then abort the T.O. ; or
- The distance required to accelerate to V1 + 2 seconds, then abort the T.O. with both engines operating.
There is also a requirement for this to be demonstrated without use of reverse thrust, or if using reverse thrust, without brakes.
Is there any situation where the ASDR with both engines operating will actually be less than the ASDR with an engine failure? Since there will be more acceleration, and more idle thrust to brake against surely it must be longer.
The only situation I can think or is if the aircraft demonstrated the RTO with reverse thrust rather than brakes?
The other problem is very similar, it states the TODR is the greatest of:
- The distance to accelerate to V2 and attain 35ft, after recognition of an engine failure at V1; or
- The distance to accelerate to V2 and attain 35ft, with both engines operating, multiplied by a factor of 1.15
This one I would assume that the T.O. with two engines will always require less distance than with the engine failure?
However with the correction factor of 1.15 does this make the TODR with both engines the longer one?
If it can be either then what sort of variables are we looking at to make it go one way or another?
[Edited 2010-09-14 04:47:00]