Originally Posted by
Capt Quentin McHale
JammedStab,
That's one of those questions that make you say Hmmmm. Could not find anything to explain as to why. The engineers said bleed air is prioritised to the ADP's to assist the centre hydraulic system electric pumps for flap and gear retraction, and, yes your engine out scenario definitely has merit with bleed air loads increasing on the good engine. 10mins is a long time... but you just never know....
Apparently 10 minutes at takeoff thrust is an option for some Boeing aircraft, typically I think for hot and high operations. So the guess is that perhaps the 10 minute inhibit would cover that option where you might not want it to come on at an innopportune while struggling to climb out with an engine failure. The 10 minute inhibit is only in auto so you still are left with the On option for that rare occasion during normal ops that you actually need it wing anti-ice. Just a guess though.
I notice that some of the other inhibits for this system while in flight that were listed earlier are at times where you may be in a situation where engine thrust would not want to be wasted for bleed use.