Re: Fuel Weight versus Initial Cruise..

From:         Alexander Schuetz <100010.1375@CompuServe.COM>
Organization: via CompuServe Information Service
Date:         14 Oct 94 02:23:35 
References:   1
Next article
View raw article
  or MIME structure

> leveling off at an intermediate FL to burn off fuel

The most economic FL (called optimum altitude by Boing) differs 
with gross weight.
The B767 for example :
Gross Weight 110 tons - 41000ft
Gross Weight 180 tons - 30000ft

As you burn about 4 to 5 t/h the optimum altitude raises about 
700ft/h on the B767.