Hi Bear,
I am sure if the BEA reported this as they did, the speed was reduced to Mach 0.80, the turbulance penetration speed and it was done by moving the throttle levers while in AP/AT. When you do this, it doesn't drop out of AP/AT. However, when the disagree event occurred and the AP & AT did dropped out, the thrust locked into whatever the setting was in AP/AT. So, I assume this would be a slightly reduced N1% verses normal level cruise N1%. If my assumption is correct, it sure influenced speed bleedoff (more rapid) in the subsequent climb event to 38K as the throttles were never touched until the TOGA command.
Last edited by Jetdriver; 14th Jun 2011 at 03:08.