Contaminated runway Vs clearway
Here is the following problem... had a few days ago:
Runway is 1800m long and raining (quite a lot). If applying the take off corrections through AFM (not using your airport analisys) you`ll find 4 tables (an A320 AFM) for:
Wet runway weight and speed decrements
1- Bleeds OFF no clearway
2- Bleeds OFF with clearway
3- Bleeds ON no clearway
4- Bleeds ON with clearway
Well the runway had a clearway, not long however, only 180 metres.
But the greatest weight decrement was using "with clearway" option. That`s the opposite of what I tought...!
So that`s my question... if you have a clearway you`re supposed to get more weight off the runway... right? Because you can achieve V2 at 35ft beyond runway end, on the clearway.
An other question... If option "no clearway" gives you best weight (more weight for takeoff). Can you actually use it, instead of "with clearway" option? Remember runway had a 180m clearway...
Thanks!