Why on these charts there are entries with weights above the MTOW?If you can't even takeoff with such a load, how is you could land?ThanksClaudio

Where did you find landing performance charts? The documentation provided only has landing runway lenghts. Landing speeds are generated from the FMC.

Well, i meant those charts.Sorry if i misleaded you.Claudio

A little up for my question.ThanksClaudio

Claudio,Normally, the higher weights are provided to allow for interpolation to be able to determine the field length associated with the max allowable takeoff weight. Note that the max structural takeoff weights listed in the PMDG Limitations documentation for the 737-600 and -700 are not the certified maximum weights. They must be the weights purchased by the operators on whose manuals the PMDG documentation is based. The max certified structural takeoff weight limits for the 737-600 and -700 are 143,500 lb and 171,000 lb, respectively. Even at these higher weights; however the PMDG landing performance data contains weights higher than would be necessary for interpolating for the max structural takeoff weight.Also, note that the instructions PMDG provides for using the landing peformance data are wrong. The first step should be to use the required runway length wind correction table to determine the equivalent no wind runway length. Enter the table at the left with the available runway length and read the number from the column with the actual wind component in the direction of landing. Contrary to what the table says, headwinds are the positive wind values, while tailwinds are negative. The number read from the table is the wind corrected runway length (which is another way of saying the no wind equivalent runway length). For example, for the 737-600, a 4500 foot runway with a 10-knot headwind is equivalent to a 4823 foot runway with no wind.Then, enter the landing runway limit weight table with the wind corrected runway length to determine the maximum allowable field length limited landing weight. Interpolate linearly in the table if necessary. For the example above, at an airport pressure altitude of 3000 feet, the maximum field length limited landing weight for a dry runway would be 128,600 lb. However, since the maximum structural landing weight for the 737-600 (provided in the PMDG limitations documentation) is 120,500, the maximum allowable landing weight would be 120,500 lb.Hope this helps,Don S.