FLEX Temperature

[Airbus.De]

My Question is

How do you calculate FLEX Temp for Airbus 320??

[foxmoth]

This normally comes either in a set of performance tables, or off a laptop performance program depending upon company. FLEX will vary on runway and weight.

[OBK!]

I've always wondered why they made the FMS work this out? Since the FMS does have access to performance data, temperatures/surface conditions/obsticle clearance heights and runway lenghts etc. Would seem more appropriate and efficient?

But that's just me! :O

[mutt]

Since the FMS does have access to performance data, temperatures/surface conditions/obsticle clearance heights and runway lenghts etc

I presume that you are talking about Airbus aircraft, but this data is not available on any Boeing aircraft.

Mutt.

[OBK!]

Yes mutt, Airbus.

boeing don't have FLEX! But still, it would be easier to use the FMC. The pilot can insert the required data, within about 30 seconds? and the FMC could work it out. But I think D-TO/FLEX is partly a company thing?

cheers
obk

[RadarContact]

While you certainly could have the FMS calculate TO performace based on MET-data, there is simply no way you could stuff all the environmental/terrain data for each runway into its already overloaded memory. Sad but true.

[RadarContact]

While I don't know about the FMS-link to a database, the personal laptop idea is becoming increasingly common. I use one myself for takeoff power calculation. Connecting it to the FMS would probably prove to be a real bu99er, though...

[saudipc-9]

What is FLEX temp? or D-TO?
cheers

[saudipc-9]

Mike,
Thanks for the explanation :)