ACS Codes on Your Knowledge Test Report

Your score tells you the result. The codes give your next study session a direction. This guide focuses on the Private Pilot Airplane test and uses a real ACS element as an example; the report-review scenarios are original teaching examples.

What are the key facts?

For Private Pilot Airplane, use the report, the applicable ACS and your instructor together.

What should you check on the report first?

Check that the report belongs to you and reflects the test you took before you start decoding its codes.

Review your name and FTN, test category, test date, score and result. Note the expiration information and the complete missed-area codes. Compare identity information with your testing and certification records. Raise discrepancies with the testing center and your instructor rather than assuming that changing an online profile repairs an already-issued report.

The FAA says the AKTR contains your name, FTN, score and codes for incorrect-answer areas. Its report instructions also address name corrections and replacement reports (FAA testing FAQ, page 3). Keep the original somewhere you can find it, with a backup copy for your own records.

Start with the report's identity, result and codes, then retain it for the next certification steps. This is an editorial checklist based on the FAA's AKTR guidance.

Make a separate study note containing the codes and topics. That lets you organize practice without copying personal identifiers into every notebook, discussion or study tool. Your study note supplements the report; it does not replace the document needed for the practical test.

How do you decode an ACS code?

Read the code from left to right: the applicable standard, Area of Operation, Task and specific element.

For example, PA.I.C.K3a appears in the current Private Pilot Airplane ACS under Weather Information. Its full topic is Atmospheric composition and stability (FAA-S-ACS-6C, printed page 3).

Worked example from FAA-S-ACS-6C, printed page 3. Copy the entire code, including its final lowercase letter.

The FAA's ACS coding explanation, printed page 9 identifies K as knowledge, R as risk management and S as skill. These letters describe different kinds of ACS elements. In this example, K identifies the knowledge element; the code is not a record of a failed flight maneuver.

Treat the last letter as useful information. K3 points to the broader meteorology element, while K3a identifies a particular part of it. Reading only “weather” is too broad to diagnose what to review. Conversely, memorizing the letters without understanding the topic does not resolve the gap.

How do you find the right element in the ACS?

Search the complete code in the applicable FAA ACS PDF and read the surrounding Task, not just the search-result line.

Use the FAA ACS index to identify the current Private Pilot Airplane document. Search for the full code exactly as printed, preserving Roman numerals, periods and any trailing letter. Then read the element and the Task's reference list.

A code points to an element in the standard, rather than directly naming a handbook chapter. The Task's references guide your reading. For the weather example, find the relevant FAA weather material and discuss the concept with your instructor. Start with the specific weakness, then connect it to the broader Task.

If a code is absent from the current PDF, check whether it has been archived. The ACS Companion Guide, Section 2 and Section 8 explains that a still-valid AKTR can contain an archived code. Use the ACS revision in effect when you tested, or the Companion Guide's archived-code list. Do not substitute a nearby current code merely because the letters look similar.

How can you turn a code into a useful review task?

Translate each code into something you can explain and apply, then discuss remaining weaknesses with your instructor.

Make a small review worksheet. Record the complete code, its exact topic, the reference you used and an explanation you can give without an answer cue. These examples show the method; they are not claims about which questions appeared on your test.

The topics above are verified in FAA-S-ACS-6C, printed pages 3 and 6. The suggested review activities are our editorial study method.

A study workflow, not an FAA endorsement process. The instructor determines whether your knowledge is satisfactory.

Try this sequence for every listed area:

1. Name the gap. Write the full code and the topic in plain language. Record whether your difficulty was a rule, a definition, a calculation or interpreting a figure.
2. Return to the reference. Read the relevant FAA material and rework the idea without looking at a practice answer.
3. Change the example. Explain what would change if one condition, chart feature or input were different. Include guesses among the topics you revisit.
4. Discuss and recheck. Bring uncertain explanations to your instructor, then return to mixed practice after a break.

Do not count distinct codes as a reconstruction of the exact questions or answers you missed. Use the list as a map of deficient elements. A familiar practice question can support review, but remembering its option letter is weak evidence of understanding.

Why review missed areas after passing?

A pass clears the knowledge-test threshold; it does not remove the deficient-area review required before the practical test.

14 CFR 61.39(a)(6)(iii) requires the authorized instructor's endorsement to certify satisfactory knowledge of areas in which you were deficient on the knowledge test. Bring the report to that review rather than relying on your overall score.

The ACS Companion Guide, Section 2 also explains that the evaluator reviews deficient subject areas during the oral portion of the practical test. That does not make the code list the complete scope of the practical test. Continue preparing across the applicable ACS Tasks while giving listed weaknesses focused attention.

How long is the passing report useful?

For the usual private-pilot case, apply the 24-calendar-month rule to the month the practical test is completed.

For example, a knowledge-test pass on October 15, 2026 normally supports completion of the practical test through October 31, 2028. Completion on November 1, 2028 falls outside that window. This is an example applying 14 CFR 61.39(a)(1)(i), not a deadline measured as 730 days from the test date.

Check the report's expiration information and your actual timeline with your instructor. Booking a practical test before a deadline is not the same as completing it within the required period. Leave time for weather, aircraft availability and any unfinished preparation.

What changes after a failed attempt?

Use the report to guide additional training, then obtain the required retest endorsement from the authorized instructor who gave that training.

14 CFR 61.49(a) requires necessary training, a proficiency determination and that instructor's endorsement. The FAA testing matrix, page 13 also lists the failed report for a PAR retest.

An old initial-test endorsement or a new appointment does not replace those retest requirements. Read the knowledge-test endorsement guide and test-day document checklist while arranging the training.

Check yourself

These are original report-reading scenarios, not released FAA test questions.

Frequently asked questions

Do ACS codes reveal the actual questions I missed?

No. They identify ACS elements to review, rather than providing the question text or your wrong answer. The FAA does not publicly release live knowledge-test questions (FAA testing FAQ, pages 1–2). Study the underlying subject and use changed examples to check your understanding.

What if my code is missing from the newest ACS?

Check the revision in effect on your test date and the archived codes in Section 8 of the ACS Companion Guide. A code can be archived while a report is still valid. Ask your instructor to resolve an uncertain match rather than guessing.

What if I lose my knowledge test report?

For tests taken on or after January 13, 2020, the FAA says you can print a duplicate through your PSI account. Earlier reports follow the FAA replacement process described in its testing FAQ, page 3. Keep the original and a backup now, and arrange replacement before your practical-test paperwork needs it.

Can FirstSolo.ai sign off my ACS review or endorsement?

No. FirstSolo.ai is solely a study tool and does not issue endorsements, now or in the future. Use it to support practice and identify topics for discussion. An authorized instructor must perform the applicable training, proficiency assessment and endorsement.

What is your next step?

Copy your complete code list into a review worksheet, identify each element and arrange a focused discussion with your instructor.

Use the private pilot written-test guide to see the whole process. Keep the endorsement requirements and test-day packing list handy if you are planning a retest.

Practice private-pilot knowledge with FirstSolo.ai, then use the topics you cannot yet explain to guide your next study session.

Sources and review notes

• FAA Private Pilot Airplane ACS, FAA-S-ACS-6C: printed pages 3 and 6 for the worked codes.
• FAA ACS index: current standard checked October 8, 2026.
• FAA ACS Companion Guide, FAA-G-ACS-2: Sections 2 and 8 for reports, review and archived codes.
• FAA ACS coding FAQ: printed page 9 for the coding structure. Its historical implementation dates are not used as current testing logistics.
• FAA knowledge-testing FAQ: updated June 1, 2026; report retention, replacement and live-question policy.
• FAA testing matrix: revised September 25, 2026; PAR threshold and retest documents.
• 14 CFR 61.39 and 14 CFR 61.49: practical-test prerequisites and retesting.

Facts checked October 8, 2026. Study activities and calendar examples are editorial teaching aids. Your instructor should confirm your report, applicable requirements and readiness.

FirstSolo.ai is independent and is not affiliated with or endorsed by the FAA. It is a study tool and does not issue knowledge-test endorsements.