I'm writing software to integrate a weight and balance chart into my website. Most of the Type Certificate Data Sheets TCDS I've read follow the form:

x to y at z lbs. or less
a to b at c lbs.
Straight line variation between points given.

I want to make sure that I test this against more complex scenarios. Are there general aviation aircraft that have more than 2 "ranges" or are otherwise exceptional that would make for good test cases? I am only concerned with GA aircraft at this time.


1 Answer 1


Are there general aviation aircraft that have more than 2 "ranges"

Yes. I happen to fly one (the PA-28 series, TCDS 2A13).
The loading graphs look like this:

PA28 loading graphs & ranges

Note also that the aircraft is certificated in both the Normal and Utility category, and the weight/CG ranges are different (Utility being a subset of what's permissible for Normal category operations) - so there are two different operating envelopes that must be considered.

  • $\begingroup$ Awesome answer! Thanks for taking the time to include the graphs. This will make a great test scenario. $\endgroup$ Jun 13, 2014 at 21:30
  • $\begingroup$ @dazedandconfused The Piper TCDS actually has the graphs in it, so it was just a cut-and-paste job. There are probably more complex examples out there, I just happen to know this one because I have to deal with the funny-shaped graph every time I work a W&B calculation. (I can't think of any aircraft which are not "straight-line variation" between the ranges offhand, so I think you can avoid having to do curve-fitting...) $\endgroup$
    – voretaq7
    Jun 13, 2014 at 21:36
  • 1
    $\begingroup$ This is actually very similar to most business jets that I have flown as well. $\endgroup$
    – Lnafziger
    Jun 13, 2014 at 22:29

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