NORMAL OPERATIONS
CRUISE
A318/A319/A320/A321
FLIGHT CREW TRAINING MANUAL
point of view, the CI affects the speeds (ECON SPEED/MACH) and cruise altitude (OPT ALT). CI=0 corresponds to maximum range whereas the CI=999 corresponds to minimum time.
The CI is a strategic parameter which applies to the whole flight. However, the CI can be modified by the crew in flight for valid strategic operational reasons. For example, if the crew needs to reduce the speed for the entire flight to comply with curfew requirements or fuel management requirements (XTRA gets close to 0), then it is appropriate to reduce the CI.
The SEC F-PLN can be used to check the predictions associated with new CI. If they are satisfactory, the crew will then modify the CI in the primary The SEC F-PLN can be used to check the predictions associated with new CI. If they are satisfactory, the crew will then modify the CI in the primary F-PLN. However, the crew should be aware that any modification of the CI would affect trip cost. However, the crew should be aware that any modification of the CI would affect trip cost.
SPEED CONSIDERATIONS
Criteria: SA
7 Applicable to: MSN 0045-0499
The cruise speed may be either:
? Managed
? Selected
MANAGED
When the cruise altitude is reached, the A/THR operates in SPEED/MACH mode. The optimum cruise Mach number is automatically targeted. Its value depends on:
? CI
? Cruise flight level
? Temperature deviation
? Weight
? Headwind component.
The crew should be aware that the optimum Mach number will vary according to the above
mentioned parameters, e.g. it will increase with an increasing headwind, e.g. +50 kt head wind equates to M +0.01.
SELECTED
Should ATC require a specific cruise speed or turbulence penetration is required, the pilot must select the cruise speed on the FCU. FMS predictions are updated accordingly until reaching either the next step climb or top of descent, where the programmed speeds apply again. The FMS predictions are therefore realistic.
NORMAL OPERATIONS
CRUISE
A318/A319/A320/A321
FLIGHT CREW TRAINING MANUAL
At high altitude, the speed should not be reduced below GREEN DOT as this may create a situation
where it is impossible to maintain speed and/or altitude as the increased drag may exceed the available thrust.
SPEED CONSIDERATIONS
Criteria: P3560, P7373, P7519, P7666, SA
8 Applicable to: MSN 1668-4078
The cruise speed may be either:
? Managed
? Selected
MANAGED
When the cruise altitude is reached, the A/THR operates in SPEED/MACH mode. The optimum cruise Mach number is automatically targeted. Its value depends on:
? CI
? Cruise flight level
? Temperature deviation
? Weight
? Headwind component.
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