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met, an amber asterix will be displayed. Once the constrained waypoint is sequenced, the ECON
Mach is resumed.
The constant Mach segment option enables to fly cruise segment at constant Mach. This guidance
is performed under managed speed control and is taken in to account for cruise predictions. This
facility is also available in the SEC F-PLN.
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.
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.
A330/A340 FLIGHT CREW TRAINING MANUAL
NORMAL OPERATIONS
CRUISE
A330/A340 FLEET NO-070 P 5/12
FCTM 17 JUN 09
SPEED CONSIDERATIONS
Criteria: LR
Applicable to: , ,
The cruise speed may be either:
• Managed
• Selected
MANAGED
When the cruise altitude is reached, i.e. "ALT CRZ " on the FMA, 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.
Should ATC require a specific time over a waypoint, the crew can perform a vertical revision
on that waypoint and enter a time constraint. The managed Mach number would be modified
accordingly, between green dot and M 0.84, to achieve this constraint. If the constraint can be met,
i.e. within ± 2 min, a magenta asterix will be displayed on the MCDU; if the constraint cannot be
met, an amber asterix will be displayed. Once the constrained waypoint is sequenced, the ECON
Mach is resumed.
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.
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.
A330/A340 FLIGHT CREW TRAINING MANUAL
NORMAL OPERATIONS
CRUISE
A330/A340 FLEET NO-070 P 6/12
FCTM 17 JUN 09
ALTITUDE CONSIDERATIONS
Applicable to: ALL
The MCDU PROG page displays:
• REC MAX FL
• OPT FL.
REC MAX FL
REC MAX FL reflects the present engine and wing performance and does not take into account
the cost aspect. It provides a 0.3 g buffet margin. If the crew inserts a FL higher than REC MAX
into the MCDU, it will be accepted only if it provides a buffet margin greater than 0.2 g. Otherwise,
it will be rejected and the message "CRZ ABOVE MAX FL" will appear on the MCDU scratchpad.
Unless there are overriding operational considerations, e.g. either to accept a cruise FL higher
than REC MAX or to be held significantly lower for a long period, REC MAX should be considered
as the upper cruise limit.
OPT FL
OPT FL displayed on the MCDU is the cruise altitude for minimum cost when ECON MACH is
flown and should be followed whenever possible. It is important to note that the OPT FL displayed
on the PROG page is meaningful only if the wind and temperature profile has been accurately
entered. The crew should be aware that flying at a level other than the OPT FL would adversely
affect the trip cost.
For each Mach number, there will be a different OPT FL. Should an FMGS failure occur, the crew
should refer to the Refer to FCOM/PER-CRZ-AEO-ALT-10 CRUISE LEVEL CHARTS or Refer
to FCOM/99 Duref Cible FCOMQRH to determine the OPT FL. FCOM and QRH charts are only
provided for four different Mach numbers.
STEP CLIMB
Applicable to: ALL
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 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
　
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