VERTICAL NAVIGATION STEP CLIMB
Since the optimum altitude increases as fuel is consumed during the flight, from a cost point of view, it is preferable to climb to a higher cruise altitude every few hours. This technique, referred to as a step climb is typically accomplished by initially climbing approximately 2000 ft above the optimum altitude and then cruising at that flight level until approximately 2000 ft below the new optimum altitude. In RVSM airspeed, It is possible to bracket the optimum altitude by 1000 ft. Step climbs can either be planned at waypoints or be optimum step points calculated by the FMGS. The FMGS computed step climb provides for minimum trip cost for the flight. The CFP Tends to indicate a step climb as soon as the predicted aircraft weight would allow. Constraints in the CFP design mean that climbs can only be designated at waypoints and not at the ideal point. For most flights, one or more step climbs may be required. It may be advantageous to request an initial cruise altitude above optimum, if altitude changes are difficult to obtain on specific routes. This could minimise the possibility of being held at a low altitude and high fuel consumption condition for a long period of time. The required/cleared cruise altitude should be compared to the REC MAX altitude. Before accepting an altitude above optimum, determine that it will continue to be acceptable considering the projected flight conditions such as turbulence standing waves or temperature change.
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