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referred to as a Step Climb, is typically accomplished by initially climbing approximately 2 000 ft above the optimum altitude and then cruising at that flight level until approximately 4 000 ft below optimum. The MCDU STEP ALT page may be called a vertical revision from the MCDU F-PLN page or from the MCDU PERF CRZ page. Step climb can either be planned at waypoint (STEP AT) or be optimum step point calculated by the FMGS (ALT). If predictions are satisfactory in term of time and fuel saving, the crew will insert it in F-PLN provided it is compatible with ATC.
It may be advantageous to request an initial cruise altitude above optimum if altitude changes are
difficult to obtain on specific routes. This minimizes the possibility of being held at a low altitude and high fuel consumption condition for long periods of time. The requested/cleared cruise altitude should
 

  NORMAL OPERATIONS
CRUISE
A318/A319/A320/A321
FLIGHT CREW TRAINING MANUAL 

be compared to the REC MAX altitude. Before accepting an altitude above optimum, the crew should determine that it will continue to be acceptable considering the projected flight conditions such as turbulence, standing waves or temperature change.
OPT FL follow up
 
The diagram above shows three step climb strategies with respect to OPT and REC MAX FL. Strategy 1 provides the best trip cost, followed by 2 then 3.
STEP CLIMB

Criteria: P7373, P7519, P7666, SA
10 Applicable to: MSN 1668-4078
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 when the aircraft weight permits. This technique,
referred to as a Step Climb, is typically accomplished by initially climbing approximately 2 000 ft above the optimum altitude and then cruising at that flight level until approximately 4 000 ft below optimum. The MCDU STEP ALT page may be called a vertical revision from the MCDU F-PLN page or from the MCDU PERF CRZ page. Step climb can either be planned at waypoint (STEP AT) or be optimum step point calculated by the FMGS (ALT). If predictions are satisfactory in term of time and fuel saving, the crew will insert it in F-PLN provided it is compatible with ATC.
The OPT STEP computation will be accurate if vertical wind profile has been properly entered. Refer to FMS USE of this section. Refer to FCOM/PER-CRZ-AEO-ALT-20 WIND ALTITUDE TRADE FOR CONSTANT SPECIFIC RANGE to provide valuable tables to assess the effect of the vertical wind profile on the optimum cruise flight level.
 

  NORMAL OPERATIONS
CRUISE
A318/A319/A320/A321
FLIGHT CREW TRAINING MANUAL 

It may be advantageous to request an initial cruise altitude above optimum if altitude changes are
difficult to obtain on specific routes. This minimizes the possibility of being held at a low altitude and high fuel consumption condition for long periods of time. The requested/cleared cruise altitude should be compared to the REC MAX altitude. Before accepting an altitude above optimum, the crew should 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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