Performance drop on B772ER ?

Date:         09 Sep 98 04:12:38 
From:         Marc Schaeffer <marcmsc*@cmdnet.lu>
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I was reported the following :

""If the airframe deterioration of the B777-200X is similar to that of
the B777-200ER then customers are in trouble. For reasons not understood
the B777-200ER has deteriorated some 1.5 to 2 percent fuel burn. What's
interesting is that this performance loss appears to be primarily
airframe related rather than engine related. For such a new aircraft it
appears to have got Boeing worried and they have yet to explain it.

Furthermore Boeing want to take up to add a further 1.5 percent weight
to the Operating Empty Weight i.e. 1.5 percent less payload available to
the operator.""

Performance drop in time are common, but frame related drops are really
strange. Can't believe this. Any 777 pilots out there to
comment/deny/confirm. Would appreciate.

Also what does the 1.5% OEW increase cover ?

Really curious,
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