​Sorry -- I think we're talking across purposes!

 

Michael asked earlier why you were up at FL410 -- you can cap the maximum level PFPX will climb you to using the box described in the Aircraft Details page, but I don't think it's necessary for this route personally. Some routes/citypairs are level-capped by the SRD or Eurocontrol, this particular route between Glasgow and LGW isn't.

 

To enter the altitude constraints, see Andy's post above, which is on the Advanced Options page -- just drop down the Speed/Altitude/Holding tab, select the appropriate waypoint and enter a flight level.

Tried entering altitude constraints per andys post but it doesn't work the way it should. I tried entering altitude constraints at waypoints before DISIT and KIDLI without success

Your loosing me here!

So is that the reason i can't enter FL200 and FL150 because of the upper airway?

What i'm trying to do is enter the altitude constraints at DISIT and KIDLI

Vernon

 

Per the PFPX Manual there are five Main Panels. The one I am writing about is the Flight Panel. The altitude I mentioned is the cruise altitude. It has nothing to do with altitude constraints at waypoints be they enroute or part of a STAR.

Well i just set PFPX fuel BIAS to 100% and i got using reserve fuel. Think i'll go back to 103

First, make sure the forecast winds used by PFPX are the same as actual winds during your session.  Also, it makes a difference that you select a reserve value that is appropriate for your intended use for the advisory message.  If you set it to expected fuel remaining has different meaning from setting it to the alternate reserves, for example.

 

The only way you are likely to have identical planned and actual winds is to "predate" your trip such that the planning and execution are using historical data.

 

When you set the bias to 103%, you are not telling PFPX to increase reserves but rather telling it you use 3% more fuel for given conditions. This means your planning is not worth much if you want to check fuel use enroute at waypoints because the planned amount used will always be higher than actual and you get a false sense that all is going well.

 

The best way to adjust bias is to compare enroute use, not fuel remaining could be just an arbitrary amout that you enter on the PERF CDU page.

PFPX winds matched ASN and was checked on the OFP.

 

My Reserve value that i always enter into the FMC is Diversion fuel + Final reserve fuel which was 1820 i rounded it off to 1.9.

 

PFPX calculated i would land with 2.1 tonnes but instead i landed with 1.8 tonnes.

 

I never had this problem when using 103.

When i used 103 enroute fuel matched that on my OFP.