B744 engine shutdown question

Date:         23 May 97 09:03:29 
From:         "FRANK TONG" <frantong@mbox2.singnet.com.sg>
Organization: Singapore Telecom Internet Service
Followups:    1 2
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When working on B744 with RB211-524G/H engine powered aircraft, when
shuting down engines, why does the engine control switch on overhead panel
will turn to alternate and alternate ligth will be on for few seconds ?
 Also, in the course note, it states that every time you shutdown the
engine, FAFC channel will switch from A to B, or B to A. However, I never
note this happen. Could somebody advice ?