PART V - OPERATING DATA

        (b)  Use of the tables
             
              (i)  Pre-flight planning
                   
                   Enter the cruise data table in the sea level block at
                   the fuel state applying immediately after take-off.
                   Select the height at which maximum range is avail-
                   able at that fuel state.  The distance available
                   includes distance covered on the climb, but not on
                   the descent.  (Absolute maximum range is obtained
                   by adding on the descent distance provided that the
                   let-down is commenced at that distance from the
                   destination.)  For short range flights inspect the sea
                   level block and select the height at which the
                   distance to be covered requires the least amount of
                   fuel.  This is the best altitude for the flight.
                   
              (ii) In-flight planning
              
                    At any stage of a flight the available range may be
                    ascertained by applying the fuel state to the level
                    flight range in the particular altitude block.
                    If increase in range is required, or if a climb has to
                    be made, the new available range may be obtained
                    by entering the existing altitude block at the
                    particular fuel state and moving vertically down-
                    wards within the block until the new altitude is
                    reached.  Figures in heavy type indicate the best
                    altitude for the maximum increase in range.  Above
                    these heights no further range increase is possible.
                    If a descent is necessitated the new range is shown by
                    moving direct from the existing altitude level flight
                    range for the particular fuel state to the new altitude
                    level flight range.

        (c)  ANM per 100 lb./T.M.N./r.p.m. curves
        
             The graphs on pages 108 and 109 show the ANM per
             100 lb. at various altitudes plotted against True Mach
             Number.  Superimposed on the curves are dotted lines
             which show the approximate r.p.m. required for a given
             speed.

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