terry.liittschwager@gmail.com  541-852-8673
HTML source of 2020-08-30    JavaScript source of 2019-04-27

on the SERVER at
Aircraft
Loads      
 in the LOCAL storage on this computer for this browser 
Aircraft
Loads      

AIRCRAFT OVERVIEW
                                                                   # of   max   min fuel  max   zfw>545
               aircraft               max    max     max     max    ACM  legal  density takeoff takeoff
     airplane    type         bow     zfw    taxi  takeoff landing seats  ACMs  by mtow  by zfw envelope

    TEST LOADS
    The test loads below can be used to verify the correctness of the program. They break down into two groups. The “trigger” group is concerned with checking to see if exceeding various limits trigger an alert and if appropriate flight envelopes are used when they should be. The “verify” group is concerned with checking the validity of the numbers produced by the program and verifying that the results match the old DOS program for the same aircraft, position configuration, and load. You can bring up any test load below by clicking on its button. Test loads may include a yellow box with text explaining the load. The box can be removed by clicking the X in its upper corner.
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    JWAB (Javascript Weight And Balance) is a browser-based SPA (Single-Page Application) weight and balance app for freighter aircraft. I wrote it as an exercise to keep my aging brain active. I'm in my 80s now, but I still add to it from time to time. There was some thought that it might replace a DOS program I wrote that was used during the years 1988 through 2016 at three freight carriers, but that didn't happen. The DOS program handled Boeing 727, 747 and 767 aircraft, Douglas DC-8 and DC-9 aircraft, and Lockheed L‑1011 aircraft. The current aircraft in JWAB are just 747s and 767s.

    The app is freeware (GPLv3). Play with it if you like. Questions to Terry at terry.liittschwager@gmail.com.

    USAGE NOTES update of 2020-07-02
    • The POSITION REFERENCE DATA radio button menu on 747 aircraft pages now has three more options:
      • “target offset” shows where each position is relative to the target zero fuel c.g. used by AUTO LOAD.
      • “zfw cg offset” shows where each position is relative to the current zero fuel c.g.
      • “sequence” is the position sequence number starting with one.
      The added options are to help in the development of the AUTO LOAD feature. The AUTO LOAD section is just above the ULD POSITIONS on 747 aircraft, but it's not yet functional. When I have it working on the 747, I'll add it to the 767.
    • Test loads being used for development have a year of 2222 to keep them at the top of the SERVER Loads list, and the word TEST appears in place of the created time of day.
    • The weight unit default for N919YY and N952YY is kilograms. The default for all other aircraft is pounds. You can use the WEIGHT UNIT IN USE radio buttons to change which unit will be used in the display. Kilogram weights are in this color. Pound weights are in this color.
    • You can speed up the program by using the Toggle Plotting button to turn off the plotting. If a linear or cumulative limit is exceeded, the plotting is automatically turned back on so you can see what happened.