Originally Posted by
Check Airman
2. Automatic WAI is inhibited when “Takeoff mode is selected” what exactly is takeoff mode? Does this refer to takeoff thrust (THR REF)?
3. Also, why’s WAI inhibited for the first 10 minutes?
Hi!
2. It looks likes “Takeoff mode” in this case is the same as for alert inhibits during takeoff: “Either engine in takeoff thrust range”.
3. Only automatic WAI operation is inhibited for 10 minutes. For manual operation it’s 5 minutes.
I agree with Rayfill, that’s done for performance reason, particularly for One Engine Inop takeoff. There’s extended 10 minute AFM time limitation for Takeoff thrust in the event of loss of thrust of one engine during takeoff. So they want to secure operating engine from inappropriate thrust reduction during that phase.