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FAA · ADX · Cheat sheet

Aircraft Dispatcher (ADX) Knowledge Test cheat sheet

A one-page summary of key ADX topics.

Certificate basics

  • Knowledge test at age 21; certificate at age 23
  • Approved course: at least 200 hours of instruction
  • Practical test on one type of large aircraft used in air carrier operations

Dispatch rules

  • Domestic fuel: destination, most distant alternate, then 45 minutes
  • No destination alternate needed with 2,000 ft and 3 SM from 1 hour before to 1 hour after ETA (domestic)
  • Domestic redispatch after more than 1 hour on the ground at an intermediate stop

Weather

  • SIGMETs cover severe hazards; AIRMETs cover moderate ones
  • A ceiling is the lowest broken or overcast layer, or vertical visibility
  • Microbursts last about 15 minutes and span under 2.5 miles

Weight and balance

  • Moment = weight × arm
  • CG = total moment ÷ total weight
  • Maximum zero fuel weight excludes usable fuel

Test yourself on ADX

Reading a summary is the easy part. Take the free 10-question diagnostic to see which of these domains you actually have, then drill the rest.