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Free ADX Practice Questions

10 free, exam-style Aircraft Dispatcher Knowledge Test (ADX) practice questions with answers and explanations. No signup required. Work through them below, then take the full free ADX practice test to study every exam domain.

Question 1

For a domestic Part 121 flight that requires an alternate, the dispatch release must provide enough fuel to fly to the destination, then to the most distant required alternate, and thereafter to fly for how long at normal cruising fuel consumption?

  1. 30 minutes
  2. 45 minutes
  3. 60 minutes
  4. 2 hours
Show answer & explanation

Correct answer: B - 45 minutes

Question 2

A domestic flight is planned to an airport whose TAF, valid from 1 hour before to 1 hour after the ETA, forecasts a ceiling of 2,500 feet and visibility of 2 statute miles. Regarding a destination alternate, the dispatcher must:

  1. List no alternate, because the forecast ceiling exceeds 2,000 feet
  2. List no alternate, because visibility is forecast above 1 statute mile
  3. List at least one alternate, because visibility is below 3 statute miles
  4. List at least two alternates, because the forecast is below basic VFR
Show answer & explanation

Correct answer: C - List at least one alternate, because visibility is below 3 statute miles

Question 3

Weather at the departure airport is below the landing minimums in the operator's specifications, so a takeoff alternate is required for a two-engine turbojet. The takeoff alternate must be no farther from the departure airport than:

  1. 1 hour at normal cruising speed in still air with one engine inoperative
  2. 1 hour at normal all-engine cruising speed under forecast winds
  3. 2 hours at normal cruising speed in still air with one engine inoperative
  4. 350 nautical miles measured along the planned route of flight
Show answer & explanation

Correct answer: A - 1 hour at normal cruising speed in still air with one engine inoperative

Question 4

A Part 121 airplane lands gear-up. No one is injured, and the damage is confined to the landing gear, flaps, wheels, and two wingtips. Under the NTSB definitions, this event is classified as:

  1. An accident, because the airplane required major repair
  2. An accident, because a gear-up landing always involves substantial damage
  3. An incident, but immediate NTSB notification is still required
  4. An incident, because the damage listed is excluded from 'substantial damage'
Show answer & explanation

Correct answer: D - An incident, because the damage listed is excluded from 'substantial damage'

Question 5

A dispatcher needs the in-flight advisory that addresses moderate icing and freezing levels affecting a planned route. Which AIRMET should be reviewed?

  1. AIRMET Sierra
  2. AIRMET Tango
  3. AIRMET Zulu
  4. Convective SIGMET
Show answer & explanation

Correct answer: C - AIRMET Zulu

Question 6

During which stage of a thunderstorm's life cycle are both updrafts and downdrafts present, producing the most violent conditions, including the greatest potential for hail and severe turbulence?

  1. Cumulus stage
  2. Mature stage
  3. Dissipating stage
  4. Towering cumulus stage
Show answer & explanation

Correct answer: B - Mature stage

Question 7

On an IFR low-altitude enroute chart, a route segment shows a published MOCA that is lower than the MEA. Compared with the MEA, the MOCA assures obstacle clearance but:

  1. Guarantees acceptable navigation signal coverage only within 22 NM of the VOR
  2. Guarantees acceptable navigation signal coverage for the entire route segment
  3. Provides no obstacle clearance over mountainous terrain
  4. Applies only when operating in radar contact with air traffic control
Show answer & explanation

Correct answer: A - Guarantees acceptable navigation signal coverage only within 22 NM of the VOR

Question 8

In transport-category takeoff performance, V1 is best described as the:

  1. Speed at which the nosewheel is lifted off the runway
  2. Lowest speed at which the airplane is controllable after losing the critical engine
  3. Maximum speed at which the pilot must take the first action to reject the takeoff
  4. Speed that provides the best engine-inoperative climb gradient after liftoff
Show answer & explanation

Correct answer: C - Maximum speed at which the pilot must take the first action to reject the takeoff

Question 9

An airplane has a gross weight of 90,000 lb. To correct a loading problem, 2,500 lb of cargo is moved aft from station 220 to station 580 (a shift of 360 inches). How far does the center of gravity move?

  1. 9.0 inches aft
  2. 10.0 inches aft
  3. 11.3 inches aft
  4. 10.0 inches forward
Show answer & explanation

Correct answer: B - 10.0 inches aft

Question 10

A dispatcher is computing the minimum required fuel for a domestic flight that requires an alternate. The figures are: taxi 1,500 lb; burn to destination 22,000 lb; destination to most distant alternate 4,000 lb; 45-minute reserve 3,500 lb. What is the minimum fuel that must be aboard at dispatch?

  1. 27,500 lb
  2. 29,500 lb
  3. 30,000 lb
  4. 31,000 lb
Show answer & explanation

Correct answer: D - 31,000 lb

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