This is the first time I experienced restriction in taxi weight on B737-800. Have you experienced that before? All I know that restrictions will be from MZFW/MTOW/MLW.

When does it happen?

  • $\begingroup$ MZFW = Maximum Zero Fuel Weight, MTOW = Maximum Take Off Weight, MLW = Maximum Landing Weight, MRW = Maximum Ramp Weight, MTW = Maximum Taxi Weight (MRW is synonymous with MTW) ... I think $\endgroup$
    – CGCampbell
    Nov 20 '19 at 19:16
  • $\begingroup$ @CGCampbell MTW and MRW are synonymous, or at least were up to my retirement in 1999. In the case of 747-100, 200, and 400 aircraft, the MRW was 3000lb greater than the highest MTOW. I say "greater than the highest MTOW" because the MTOW varied depending on the center of gravity. $\endgroup$
    – Terry
    Nov 20 '19 at 21:05

The Maximum Taxi Weight (MTW) is one of the weight limitations in the FCOM:

737-800 Weight Limitations
(Boeing 737-800 FCOMv1 L.10.3 Limitations - Operating Limitations - Weight Limitations)

It can be the limiting factor when the actual takeoff weight including required fuel is very close to the MTOW and adding taxi fuel would get you above this limit. Note that the difference between MTW and MTOW is only 500 lbs (about 2 hours of APU use or 35 minutes of taxi). If the required taxi fuel is higher than that (which can happen at a busy airport), you are limited by MTW.


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