B744 Thrust Reduction

Date:         01 Nov 97 18:55:52 
From:         "Frank Tong" <frantong@mbox2.singnet.com.sg>
Organization: Singapore Telecommunications Ltd
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Recently B744 with RB211 engines has a problem of thrust reduction after
takeoff.  An uncommand thrust change from takeoff to climb just after lift
off (400 ft).  This happen after Vnav taking over control of aircraft.
Temporary solution is to cycle FMC (left and right) CBs every transit.
I belive is the software problem in FMC, need to reset all the flags in
FMC.  Therefore, this problem should has been encounted long time ago.
Does anybody have detail on this ?