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

Data Version TEST updated 2019-04-15

on the SERVER at https://747.terryliittschwager.com
Aircraft















Loads      
  test file
  test file
  test file
  test file
  test file
  test file
 336.4 days
 347.3 days
 434.7 days
 458.7 days
 462.5 days
 525.1 days
 525.9 days
 560.6 days
 610.1 days
 829.3 days
 829.3 days
 861.3 days
 961.4 days
 973.0 days
 974.2 days
 1247.3 days
 1357.7 days
 1501.7 days
 1515.6 days
 1654.6 days
 1655.4 days
 1655.4 days
 1655.5 days
 1655.5 days
 1657.9 days
 1718.8 days
 1773.8 days
 2152.3 days
 2155.6 days
 2371.2 days
 2371.3 days
 2461.4 days
 2509.6 days
 2626.3 days
 2683.1 days
 2728.7 days
 in the LOCAL storage on this computer for this browser 
Aircraft
Loads      
NO LOCAL AIRCRAFT - There are currently no aircraft in
this browser's LOCAL storage. When you select an
aircraft from the SERVER, it will automatically be put
in LOCAL storage for use when there is no Internet
access.
NO LOCAL LOADS - There are currently no loads in this
browser's LOCAL storage.

From an aircraft page, you can use “F9 Save Load to
LOCAL” to put a load in LOCAL storage and it will
show here when you next bring up this page. This happens
independently of whether there is Internet access or not.

If you use the "F10 Send Load to SERVER", a backup copy
of the load sent will also appear here the next time you
bring up this page.

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
  1. N402YY   B747-481F    351438  611000  913000  910000  653000    8     6      no      no      no
  2. N403YY   B747-481F    351603  611000  913000  910000  653000    8     6      no      no      no
  3. N492EV   B747-446BCF  360288  610000  873000  870000  652000    8     6      no      no     yes
  4. N700XX   B747-400F    352577  635000  877000  875000  666000    8     6     yes     yes      no
  5. N740YY   
  6. N741YY   B747-4H6SF   362006  610000  873000  870000  652000   10    10      no      no     yes
  7. N742YY   B747-446SF   363008  610000  873000  870000  652000   10    10      no      no     yes
  8. N743YY   
  9. N744YY   
  10. N745YY   
  11. N760XX   
  12. N761XX   B767-341SF   180750  309000  413000  412000  326000    4     4      no      no      no
  13. N782YY   B747-400ERF  351088  611000  913000  910000  653000    8     6      no      no      no
  14. N919YY   
  15. N952YY   B747-400BCF  365579  610000  873000  870000  652000    8     6      no      no      no

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.
  2.   Triggers using the ZFW > 545,000 lbs takeoff envelope of a 747.
  5.   Triggers exceeding the increased aft body cumulative limits of a 747.
  6.   Triggers exceeding the lateral imbalance limit of a 747.
×

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.