I recently heard the term QBD which the Aviation Dictionary explains is the fuel endurance in terms of hours. If it is an acronym, what is its expansion? If not, what is it derived from?

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    $\begingroup$ @VivianjeetSinghSudan There is also a more polite way to let members know that their question could have been answered with a bit of Google-Fu. A "Welcome to Aviation.SE" as the start of your comment especially with new users can make the difference. ;) $\endgroup$ – SentryRaven Jun 2 '15 at 9:00
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    $\begingroup$ Welcome to Aviation.SE, topher! :) $\endgroup$ – SentryRaven Jun 2 '15 at 9:09
  • $\begingroup$ @VivianjeetSinghSudan I did and found the explanation as in the question but no information on its origins. Google is subjective. $\endgroup$ – topher Jun 2 '15 at 10:27
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    $\begingroup$ We don't direct people to Google; Google directs people to us. $\endgroup$ – Marcks Thomas Jun 2 '15 at 10:56
  • $\begingroup$ I smell pride, @MarcksThomas $\endgroup$ – Victor Juliet Jun 2 '15 at 11:51

It comes from Q codes for morse communication. They where set up without a clear rhyme or reason that I can see besides being ordered alphabetically.

  • $\begingroup$ I'm not sure you can even say they are grouped alphabetically. QRJ? ("How many words have you to send?") doesn't have much in common with QRM? ("Are you being interfered with?"), just to mention one example. $\endgroup$ – a CVn Jun 2 '15 at 11:41

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