Blah,
That's correct (almost). To dispatch you must legally comply with the regulations and so that must include the factors. This is therefore covered before taxi and should be looked after by your ops guys hence it is displayed as a limiting weight on the OPT.
Once flight has started ie "enroute" you only have to safely land with whatever you have so no factors are included in the OPT and it simply displays actual landing distance needed. That means you do not have to apply any factors to the enroute landing data at any stage in the flight and that also includes non-normals when airborne so relax. The enroute page is simply a reproduction of the advisory data in the performance in flight section of the QRH.
Here's 2 extracts from the manuals below; if you want to know more check out this http://www.ifalpa.org/downloads/Leve...20aircraft.pdf
Dispatch related Landing Info includes landing weight limitation for the selected RWY condition and for the selected aircraft configuration. The associated speed Vref30+5 is displayed. In addition, landing weight limitation for icing and low visibility conditions under the same aircraft configuration is given.
Dispatch related landing information on a DRY runway is based on the "Required Landing Distance" which is 167% of the demonstrated landing distance during aircraft certification.
Dispatch related landing information on a WET runway is based on 115% of the required landing distance on a DRY runway.
Dispatch related landing information on a SLIPPERY and CONTAMINATED runway is based on 115% of the actual landing distance on contaminated runway during aircraft certification OR the required landing distance on the WET runway, which ever is longer.
Quick Turnaround weight and time are included in the dispatch related landing info. If landing weight exceeds the maximum quick turnaround weight for the airport OAT and QNH wait the specified time and check the wheel thermal plugs that they are not melted before executing a subsequent takeoff.
Advisory information-These values are actual landing distances and do not include the 1.67 regulatory factor. Therefore they cannot be used to determine the dispatch required landing field length.
Last edited by 8che; 2nd May 2013 at 23:08.