- The ADX is the FAA Aircraft Dispatcher Knowledge Test - required before you can sit for the practical (oral and practical) exam.
- You must be at least 23 years old and able to read, speak, write, and understand English to be eligible.
- The test spans six specific domains, from Flight Planning/Dispatch Release through Abnormal and Emergency Procedures.
- Passing the knowledge test does not expire your eligibility immediately, but you must complete the practical within 24 months.
Who Needs the ADX Certificate?
Every person who wants to work as a certificated aircraft dispatcher in the United States needs to pass the FAA Aircraft Dispatcher Knowledge Test - commonly called the ADX - as one of two major milestones on the path to certification. The knowledge test comes first, and it is the gate through which every candidate must pass before scheduling the oral and practical evaluation with an FAA-designated examiner.
Aircraft dispatchers hold a shared responsibility for every domestic and international flight operated under Part 121 (air carrier) rules. They co-sign the dispatch release, monitor flights in progress, and hold the legal authority to delay, divert, or cancel a flight if conditions warrant. Airlines - including major carriers, regional carriers, and cargo operators - require their dispatchers to hold the FAA Aircraft Dispatcher Certificate. That single credential is non-negotiable under 14 CFR Part 65.
If you are exploring whether this career path is right for you, start by reviewing the full ADX Exam Prerequisites and Eligibility Requirements checklist so you understand every hurdle before you invest in training.
FAA Eligibility Requirements
The requirements to take the ADX knowledge test are set by the FAA under 14 CFR Part 65, Subpart C. They are deliberately accessible compared to pilot certification, but they are firm.
Age
You must be at least 23 years old to be issued an Aircraft Dispatcher Certificate. However, there is no requirement to be 23 at the time you sit for the knowledge test - you can pass the ADX before your 23rd birthday and then complete the practical after you reach that age. The certificate itself cannot be issued until you meet the age threshold.
Language Proficiency
You must be able to read, speak, write, and understand the English language. This is a hard requirement with no waivers. The dispatch environment - NOTAMs, PIREPs, ATIS broadcasts, ATC coordination, airline operations manuals - is entirely conducted in English, and the exam reflects that reality from start to finish.
Knowledge Requirement
You must demonstrate the aeronautical knowledge outlined in 14 CFR 65.59 by passing the FAA knowledge test. The test is a prerequisite for the practical exam; you cannot schedule the oral and practical evaluation until you hold a passing score report.
Practical Experience or Approved Training
Before the certificate is issued, you must also meet one of the experience pathways: either complete an FAA-approved aircraft dispatcher course (typically around 200 hours of ground instruction at a Part 65 school) or accumulate a combination of flight time, meteorology experience, and air traffic control experience as defined in the regulation. Most candidates today attend an approved dispatcher school, which also prepares them directly for the knowledge test content.
What the Knowledge Test Actually Covers
The ADX is not a general aviation quiz. It tests a tightly defined body of knowledge mapped to six domains, and every question connects to something a working dispatcher would actually need to know or decide. Understanding the domain structure before you begin studying is one of the most important strategic moves you can make.
Domain 1: Flight Planning / Dispatch Release
This is the largest and most foundational domain. It covers the construction and legal requirements of the dispatch release, fuel planning (including alternate fuel, reserve fuel, and contingency fuel), route selection, airspace structure, performance planning, weight and balance concepts, and the regulations governing the dispatcher's authority and co-sign responsibility.
- Minimum fuel calculations and fuel planning logic under Part 121
- Alternate airport requirements and the conditions under which an alternate is required
- Dispatch release contents required by regulation
- Weight and balance principles as they apply to dispatch authority
- Route filing, preferred routes, and NAVAID/fix identification
Domain 2: Preflight, Takeoff, and Departure
This domain tests your understanding of the preflight phase from the dispatcher's seat - not the cockpit. It includes NOTAMs, airport analysis, takeoff performance data, obstacle departure procedures, SIDs, and the coordination responsibilities that exist between dispatch and the flight crew before the aircraft leaves the gate.
- Takeoff minimums under Part 121 vs. general aviation rules
- Obstacle departure procedure (ODP) and SID interpretation
- NOTAM types (FDC, local, TFR) and their operational impact
- Airport analysis charts and balanced field length concepts
Domain 3: Inflight Procedures
Once the aircraft is airborne, the dispatcher's responsibility does not end - it continues. Domain 3 covers weather monitoring en route, divert decision-making, turbulence and icing reports, PIREP interpretation, ATC reroutes, and how dispatchers communicate with flight crews to fulfill the joint responsibility standard.
- In-flight weather products: SIGMETs, AIRMETs, PIREPs, center weather advisories
- Fuel monitoring and decision altitude for diversions
- ETOPS (extended operations) concepts and divert airport requirements
- Radio communication responsibilities and documentation
Domain 4: Arrival, Approach, and Landing Procedures
This domain shifts focus to the destination environment. It tests instrument approach procedure interpretation, landing minimums, ATIS decoding, runway condition reporting (RCR/RCAM), STARs, and the conditions under which a dispatcher must coordinate a destination change.
- ILS, RNAV, VOR, and NDB approach minimums and their differences
- Category II and Category III operations (low-visibility approaches)
- Runway condition assessment matrix (RCAM) and braking action reports
- ATIS/D-ATIS decoding and its operational significance
Domain 5: Post-Flight Procedures
Often overlooked in casual study, Domain 5 covers the dispatcher's obligations after the flight completes: irregularity reporting, record retention, ASAP (Aviation Safety Action Program) considerations, and how post-flight data informs future dispatch releases. Questions here tend to be regulation-based and reward precise knowledge of CFR language.
- Record-keeping requirements under Part 121
- Irregularity report filing and timeframes
- Safety reporting systems and non-punitive reporting culture
Domain 6: Abnormal and Emergency Procedures
This is arguably the highest-stakes domain on the exam because it maps most directly to life-safety decisions. It covers in-flight emergencies from the dispatcher's perspective - decompression, engine failures, fuel emergencies, hijack procedures, medical emergencies, and the dispatcher's authority and legal obligations when an emergency exists.
- Dispatcher authority to declare an emergency on behalf of the flight
- Minimum equipment list (MEL) and its relationship to dispatch decisions
- Emergency fuel definitions and divert thresholds
- Decompression and emergency descent profiles as they affect routing decisions
- Hijack and security event procedures under current federal requirements
To truly prepare for all six domains, you need more than reading - you need timed, scored practice under exam conditions. The ADX Exam Prep practice test platform gives you access to questions organized by domain so you can identify weak areas before test day.
Registration, Testing Centers, and Fees
The ADX knowledge test is administered by FAA-approved testing vendors at Authorized Testing Centers across the country. You do not register through the FAA directly for the knowledge test - you schedule through the testing vendor's online portal.
What to Bring to the Testing Center
On test day, you will need to present a government-issued photo ID. You will also need an FAA-issued written test authorization if applicable, or documentation from an approved Part 65 dispatcher school certifying that you have completed the required training. The testing center will provide a calculator and scratch paper; personal calculators are not permitted.
The Test Format
The ADX knowledge test consists of multiple-choice questions. Each question has three answer choices. The passing standard set by the FAA is a score of 70 or higher. Questions are drawn from the FAA's published Airman Knowledge Test question bank - which means practicing with realistic question formats matters as much as studying the underlying material.
Building the Domain-Specific Knowledge You Need
Passing the ADX is not a matter of memorizing a list of facts. The questions often present operational scenarios - a weather product, a performance chart, a regulatory excerpt - and ask you to apply knowledge to a decision. That means your preparation needs to go two levels deep: first, understanding the concept, and second, being able to apply it under time pressure with three plausible answer choices in front of you.
The most important references to internalize are the Federal Aviation Regulations (14 CFR Parts 1, 61, 65, 71, 91, 119, and 121), the Aeronautical Information Manual (AIM), FAA Advisory Circulars relevant to dispatch operations, and the FAA Dispatcher Handbook. Every domain on the test draws from one or more of these sources.
Weather interpretation is a significant cross-domain skill. METARs, TAFs, PIREPs, SIGMETs, AIRMETs, prog charts, and winds-aloft forecasts appear across Domains 1, 2, 3, and 4. If you have limited weather background, invest extra time here before moving to performance calculations.
For a complete look at how to sequence your preparation across these domains, the ADX Study Schedule: How to Plan Your Prep Time article walks through a structured approach week by week.
A Domain-Focused Prep Schedule
Every candidate's timeline differs, but the six domains do not carry equal weight or equal difficulty. Here is a framework that prioritizes high-volume and high-application domains early, builds toward regulatory precision in the middle weeks, and uses the final stretch for timed full-length practice.
Domain 1: Flight Planning / Dispatch Release
- Study Part 121 fuel requirements in depth; be able to calculate alternate fuel logic without reference
- Memorize dispatch release required contents under 14 CFR 121.687
- Begin working through Domain 1 practice questions on the ADX practice test platform
Domains 2 and 4: Departure and Arrival Procedures
- Read and decode at least one SID and one STAR chart daily
- Study ILS approach plates: identify DA, MDA, visibility minimums, and missed approach procedures
- Review takeoff minimums and how they differ from Part 91 operations
Domain 3: Inflight Procedures and Domain 6: Abnormal/Emergency
- Practice decoding SIGMETs and center weather advisories under time pressure
- Study dispatcher authority during emergencies - know exactly what 14 CFR 121.557 and 121.559 say
- Work MEL scenarios: know when a dispatch can proceed with inoperative equipment
Domain 5 and Full-Length Practice
- Review record-keeping regulations and irregularity reporting procedures
- Take at least two full-length timed practice tests and review every missed question by domain
- Return to your weakest domain for a final targeted review session
| Domain | Core Regulatory Reference | Key Skill to Master | Common Weak Area |
|---|---|---|---|
| Domain 1: Flight Planning/Dispatch Release | 14 CFR 121.617-121.693 | Fuel planning and alternate requirements | Conditional alternate weather minimums |
| Domain 2: Preflight, Takeoff, and Departure | 14 CFR 121.197; AIM Departure Procedures | Obstacle departure and SID interpretation | Takeoff alternate requirements |
| Domain 3: Inflight Procedures | AIM; AC 00-45 (Weather Services) | In-flight weather product decoding | ETOPS divert airport rules |
| Domain 4: Arrival, Approach, and Landing | 14 CFR 121.651; TERPS | Approach plate minimums; RCAM | Category II/III operational requirements |
| Domain 5: Post-Flight Procedures | 14 CFR 121.695-121.711 | Record retention and irregularity reports | Exact retention timeframes |
| Domain 6: Abnormal and Emergency | 14 CFR 121.557-121.559 | Dispatcher authority in emergencies | Joint vs. sole dispatcher authority distinction |
Frequently Asked Questions
No. The Aircraft Dispatcher Certificate is entirely separate from any pilot certificate. You do not need flight hours, a student pilot certificate, or a medical certificate. You do need to meet the age, language, knowledge, and experience requirements under 14 CFR Part 65, Subpart C - none of which involve holding a pilot certificate.
A passing ADX knowledge test result is valid for 24 months from the date you pass. You must complete the oral and practical examination with an FAA-designated examiner within that 24-month window. If you do not, you must retake and pass the knowledge test before you can attempt the practical again.
The FAA allows you to take the knowledge test before completing your training, but most Part 65-approved dispatcher schools recommend completing the curriculum first because the test draws directly from course content. Check with your specific school - some require completion before they will endorse you for the test, while others allow concurrent preparation.
The FAA requires a minimum score of 70 to pass the ADX knowledge test. There is no partial credit - your score is calculated as a percentage of questions answered correctly out of the total questions on your test. Candidates who do not reach 70 may retake the test after a waiting period set by the testing vendor.
Start with Domain 1 (Flight Planning/Dispatch Release) and Domain 6 (Abnormal and Emergency Procedures) - these two domains are the most content-dense and carry the most direct connection to operational dispatcher authority. Then work systematically through the remaining domains. The ADX Study Schedule: How to Plan Your Prep Time provides a week-by-week breakdown to guide your sequencing.
Ready to Start Practicing?
The best way to confirm you understand the ADX domains - not just that you've read about them - is to answer questions under realistic test conditions. Our practice test platform covers all six domains with questions drawn from the FAA knowledge test bank, full explanations for every answer, and domain-level scoring so you know exactly where to focus next.
Start Free Practice Test