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The above two constraints limit the maximum flexible temperature at ISA +40 (55 °C at sea level).
‐ The flexible takeoff thrust cannot be lower than the Max Continuous thrust used for the final takeoff
flight path computation (at ISA +40).
‐ The flexible temperature cannot be lower than the flat rating temperature, TREF (ISA +15), or the
actual temperature (OAT).
‐ Flexible takeoff is not permitted on contaminated runways.
‐ The operator should check the maximum thrust (TOGA) at regular intervals in order to detect any
engine deterioration, or maintain an adequate engine performance monitoring program to follow up
the engine parameters.
A330/A340 FLIGHT CREW
OPERATING MANUAL
PERFORMANCE
TAKEOFF
TAKEOFF CHARTS - FLEXIBLE TAKEOFF (TEMPERATURE ENTRY)
A330/A340 FLEET PER-TOF-TOC-14-30 P 2/2
FCOM 19 AUG 10
REQUIREMENTS
Applicable to: ,
Thrust must not be reduced by more than 25 ‐ % of the full rated takeoff thrust.
‐ The flexible takeoff EPR cannot be lower than the Max Climb EPR at the same flight conditions.
The FADEC takes the above two constraints into account to determine the flexible EPR.
The above two constraints limit the maximum flexible temperature at ISA +48 (63 °C at sea level).
‐ The flexible takeoff thrust cannot be lower than the Max Continuous thrust used for the final takeoff
flight path computation (at ISA +40).
‐ The flexible temperature cannot be lower than the flat rating temperature, TREFSee * , or the
actual temperature (OAT).
Note: *TREF being a function of pressure altitude read it on the takeoff chart.
‐ Flexible takeoff is not permitted on contaminated runways.
‐ The operator should check the maximum thrust (TOGA) at regular intervals in order to detect any
engine deterioration, or maintain an adequate engine performance monitoring program to follow up
the engine parameters.
A330/A340 FLIGHT CREW
OPERATING MANUAL
PERFORMANCE
TAKEOFF
TAKEOFF CHARTS - FLEXIBLE TAKEOFF (TEMPERATURE ENTRY)
A330/A340 FLEET PER-TOF-TOC-14-40 P 1/2
FCOM 19 AUG 10
RECOMMENDATION
GENERAL
Applicable to:
• Extension of engine life will be provided by the use of the highest flexible temperature. However a
reduction of a few degrees from a high flexible temperature does not cause significant penalty to
engines.
• A higher flap setting will provide additional aft body clearance, lower speeds and more comfort.
Using the same takeoff chart, for a given weight it is possible to :
‐ Select a temperature lower than the maximum determined one and keep the speeds defined at
maximum temperature or,
‐ Move towards the left side (tailwind) of the takeoff chart while remaining within the same
configuration and looking for the same actual takeoff weight at lower temperature.
This produces a lower flexible temperature and, in general, lower takeoff speeds (V1/VR/V2).
Using one of the two above possibilities, check that the selected temperature is greater than the
actual temperature (OAT) and greater than the flat rating temperature (TREF).
GENERAL
Applicable to: ,
• In order to extend engine life, it is recommended to use the greatest thrust reduction level.
• However, to improve the takeoff performance the thrust can be increased by selecting a lower flex
temperature.
Using the same takeoff chart, for a given weight it is possible to :
Select a temperature lower than the maximum determined one ‐ and keep the speeds defined at
maximum temperature or,
‐ Move towards the left side (tailwind) of the takeoff chart while remaining within the same
configuration and looking for the same actual takeoff weight at lower temperature.
This produces a lower flexible temperature and, in general, lower takeoff speeds (V1/VR/V2).
Using one of the two above possibilities, check that the selected temperature is greater than the
actual temperature (OAT) and greater than the flat rating temperature (TREF).
TAKEOFF PROCEDURE
Applicable to: ALL
Depending on environmental takeoff conditions, the following procedure is recommended.
A330/A340 FLIGHT CREW
OPERATING MANUAL
PERFORMANCE
TAKEOFF
TAKEOFF CHARTS - FLEXIBLE TAKEOFF (TEMPERATURE ENTRY)
A330/A340 FLEET PER-TOF-TOC-14-40 P 2/2
FCOM 19 AUG 10
CONDITIONS PROCEDURE REASON
Dry or wet, well paved runway Use flap setting giving the optimum
performance. If takeoff performance is not
limiting, consider the use of higher flap setting.
Extend engine life/improve aft body
clearance.
High altitude takeoff Use CONF2/CONF3 Improve comfort.
Badly paved runway
or
Accelerate stop distance limited
runway
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A330/A340机组操作手册 FLIGHT CREW OPERATING MANUAL FCOM 6(24)
