Thanks for the info guys... managed to get my hands on the AMM
Quote from it...
Operational Mode Inhibits
With AUTO or ON selected, any of these operational mode inhibits keeps the WAI valves closed:
- Airplane on the ground (except during an initiated or periodic BITE test)
- TAT is more than 50F and the time since takeoff is less than 5 minutes
- Takeoff mode and airplane in the air less than 10 minutes
- Auto slat operation
- Air-driven hydraulic pump operation
- Engine start
- Bleed air temperature less than 200F (93C).