5 hours ago, Bobsk8 said:

Yeah, I wouldn't think some iPad calculation would  be foolproof for the safety of a  $300 million dollar aircraft. 

It’s not just an iPad calc though irl. You get the figures from a load sheet and check them with your own expected weights from the OFP and the FMC then you both do a calc checking the inputs and the results etc 

The performance input phase of the FMC setup is pretty important and although the actual calc is pretty simple and can be done on an iPad (Boeing OPT app) there’s multiple checks on all the data going into the calculation itself. 

2 hours ago, g-liner said:

It’s not just an iPad calc though irl. You get the figures from a load sheet and check them with your own expected weights from the OFP and the FMC then you both do a calc checking the inputs and the results etc 

The performance input phase of the FMC setup is pretty important and although the actual calc is pretty simple and can be done on an iPad (Boeing OPT app) there’s multiple checks on all the data going into the calculation itself. 

Yup, that's all captured on the load closeout procedure which will be performed either way.

But the advantage of the server side system like Dynamic Source is that it's attached to the factored performance data for each tail in the fleet, as continuously updated by FOQA and other software on the aircraft.  Thus credit can be taken (and penalties applied) for engines that are producing actual thrust values on either side of an average for a given N1.

Doing this via an iPad app would require an Internet connection (not always guaranteed) to access this server side data anyway.

The iPad OFP is a perfectly safe perf calculator and of course more than enough for the sim, but like I said, there's a reason that most airlines in real life are using a superior system.