ADX Exam Retake Policy: Rules, Fees, and Timelines 2026

Understanding the ADX Retake Policy

Failing the Aircraft Dispatcher Knowledge Test - officially the ADX - is frustrating, but it is not a career-ending event. The Federal Aviation Administration has a clearly defined retake policy that governs how soon you can test again, how many times you can attempt the exam, and what the process looks like each time you sit down at a PSI testing center. If you failed or are preparing a contingency plan before your first attempt, understanding these mechanics in advance can save you both time and money.

The ADX is administered through PSI Exams (previously CATS), the FAA's designated computer testing provider. Because the exam is a federally regulated knowledge test, the retake rules are set by FAA regulations rather than by the testing vendor or any individual training program. That distinction matters - it means the policy is uniform across every testing center in the country, and no center can waive or modify waiting periods on your behalf.

Waiting Periods and Attempt Limits

The Mandatory Wait After a Failure

Under FAA regulations, if you fail the ADX knowledge test you must wait a minimum of 30 calendar days before you are eligible to retake it. This rule applies to your second attempt, your third attempt, and every subsequent attempt after that. The 30-day clock starts on the date you took the test - not the date you received your official score report, not the date you tell your training program, and not the date you re-register. The test date on your score report is the authoritative start point.

There is one narrow exception to the 30-day waiting period: if a certificated ground instructor or an authorized instructor provides you with additional training and endorses your logbook or training record specifically recommending you for a retest, the FAA does not require you to wait the full 30 days in all circumstances. However, the practical reality is that most testing centers still enforce the standard window because the administrative process of verifying an instructor endorsement takes time. Candidates who are pursuing this exception should contact their PSI testing center directly and have their documentation prepared well in advance.

Is There a Maximum Number of Attempts?

The FAA does not impose a hard cap on the total number of times you can attempt the ADX knowledge test. In theory, you can retake it as many times as needed, provided you observe the 30-day waiting period between each attempt and pay the associated fee. However, employers and dispatch training programs do track attempt history. Airlines and aviation operations centers that hire dispatchers will typically review your airman records through the FAA Airmen Inquiry system, and a long string of failed attempts can raise questions during the hiring process. Practicality, not regulation, is the real limit on attempts.

Fees, Registration, and What You Pay Each Time

The Cost of Each Attempt

The ADX knowledge test carries a fee that is paid directly to PSI Exams at the time of registration. This fee is required for every single attempt - including retakes. There is no discounted second-attempt rate, no fee waiver for candidates who narrowly missed a passing score, and no refund if you cancel outside of PSI's cancellation window. Every time you register, you are paying the full testing fee from scratch.

The fee structure is set by PSI under its contract with the FAA and can be updated periodically, so the most reliable place to verify the current amount before you register is directly on the ADX Exam Prep practice test platform or through the PSI scheduling portal. Budget for the possibility of multiple attempts when you are financially planning your path to dispatch certification.

Registration Mechanics

Registering for a retake follows the exact same process as your original registration. You schedule through PSI's online portal, select a testing center, choose a date that falls at least 30 days after your previous attempt (or later if you need more preparation time), and pay the fee. There is no special "retake registration" pathway - the system treats each attempt as a fresh booking. Bring your government-issued photo identification to the testing center on the day of your exam; the requirements do not change for a retake.

If you are enrolled in a Part 65 dispatch training program, notify your program coordinator when you schedule your retake. Some programs have their own internal policies about how many attempts they will support, and coordinating with them early ensures you have access to any additional instructor-led review they offer before your next test date. For a full overview of what approved programs provide, see the ADX Approved Training Programs and Courses 2026 guide.

What the Test Covers on a Retake

One of the most important things to understand about retaking the ADX is that the exam question pool does not change between your attempts based on your previous performance. The FAA maintains a large question bank, and the testing software draws a randomized selection each time you sit. You will not simply see "the questions you got wrong last time" on a retake - you will receive a new, randomized sample from the full pool covering all six exam domains.

This is why a targeted, domain-specific review strategy is far more effective than trying to memorize the exact questions from your previous attempt. Your score report already tells you exactly where your knowledge is weakest, which makes it the single most valuable document in your retake preparation.

Diagnosing Your Domain Gaps After a Failure

Your ADX score report from PSI breaks down your performance across the six FAA knowledge test domains. This breakdown is not just a formality - it is a diagnostic map. Before you open a single study resource, read this report carefully and identify which domains fell below an acceptable performance level for you personally.

Domains 2 through 5 - covering Preflight, Takeoff, and Departure; Inflight Procedures; Arrival, Approach, and Landing Procedures; and Post-Flight Procedures - each carry their own clusters of commonly missed question types. Domain 3 (Inflight Procedures) in particular features weather deviation, PIREP interpretation, and fuel monitoring scenarios that require integrating several knowledge areas at once. Domain 4 (Arrival, Approach, and Landing Procedures) frequently tests instrument approach minimums, NOTAM interpretation affecting landing performance, and alternate minimums - all areas where candidates who studied broadly but not deeply will struggle on a retake.

Structuring Your Retake Preparation by Domain

The 30-day minimum waiting period is actually a reasonable amount of time for a focused retake campaign - provided you use your score report to set the agenda rather than starting over from the beginning. The structure below is a domain-prioritized approach that allocates review time based on where candidates most commonly fail rather than treating all six domains equally. Adjust based on your personal score report findings.

If your training program offers instructor access during your retake window, use it specifically for the domains where your score was lowest. Instructor-led review of Domain 1 (Flight Planning and Dispatch Release) in particular - walking through actual dispatch release documents, weather packages, and fuel planning calculations - is difficult to replicate through self-study alone. For candidates who want a more comprehensive look at what structured programs offer, the ADX Approved Training Programs and Courses 2026 article outlines how different program types support retake candidates.

One final note on timing: do not schedule your retake the moment you become eligible. The 30-day minimum is a floor, not a target. If your practice test scores on the ADX Exam Prep platform are not consistently reaching passing territory across all six domains, add additional time before you book. Every failed attempt adds cost and, depending on where you are in the certification process, delays your path to the Part 65 certificate and dispatcher employment. The employers who hire dispatchers - airlines operating under Part 121, charter carriers, and some cargo operators - are not evaluating raw speed to certificate. They are evaluating reliability and competence, and your approach to a retake reflects both.

For a broader look at how the retake policy fits into the full certification journey, revisit the ADX Exam Retake Policy: Rules, Fees, and Timelines 2026 overview for context on how these rules interact with your overall certification timeline.

Frequently Asked Questions