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Atm box in EFB for takeoff calculations

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    Atm box in EFB for takeoff calculations


    First of all what does atm stand for and can you put anything other than the pre populated maximum thats already in there,i looked in fcom and the EFB manual but could not answer this,thanks
    Wayne Such

    ATM is assumed temprature method, you'll probably have heared of it by the name flex temprature.
    Flex temp is the Airbus work, ATM the Boeing one.


      That is the Assumed Temperature Method, which is one of two ways TO thrust is allowed to be reduced. The other being TO Derates.
      Xander Koote - F/O B777
      All around aviation geek


        Thanks very much, should it only always be maximum in the atm box
        Wayne Such


          Originally posted by Jetman View Post
          Thanks very much, should it only always be maximum in the atm box
          Derated takeoffs can be accomplished in three different ways with Boeings as far as I know (I'm not a real pilot but I play one on the computer). The first method is the ATM as described above, while the second method utilizes a fixed DTO rate in which either DTO1 or DTO2 is selected. The DTO method simply limits thrust to a constant fixed maximum N1, whilst the ATM method thrust output varies according to calculations based on local runway conditions. The third method utilizes a combination of both the ATM and the DTO methods. If you enter a DTO setting in the thrust selection box instead of leaving it at MAX, the OPT will output a modified ATM temperature based on both local runway conditions and the DTO selection made.

          PMDG's second tutorial included with the NGXu package illustrates a DTO + ATM derate combination method in fact.

          Real pilots on here please correct me if I have it wrong....

          -Aaron Cumberland


            Thank you kind sir
            Wayne Such


              In our company's EFB, the ATM in OPT is locked at MAX as well.
              As OPT manual says, it's company's setting to unlock that, thus you can use lower ATM.
              While it's also OK just imput lower ATM in FMC than what EFB gives and use EFB's V-speed, if you really want to be conservative, but most carrier and airport would like you to use the lowest possible thrust for all the benefit.
              ZHU Hai
              B737 Ground instructor