Aeronautical Knowledge (private Pilot)

Research Notes — § 61.105 Aeronautical Knowledge (Private Pilot)

Governing Reference — Private Pilot ACS

The Airman Certification Standards for Private Pilot — Airplane (FAA-S-ACS-6C) is the definitive reference for knowledge test and practical test evaluation. Each knowledge area in § 61.105(b) maps to ACS task codes. Available at: faa.gov — ACS

Knowledge Test Reference

The FAA Private Pilot Airplane knowledge test (PAR) has 60 questions, 2.5-hour time limit, 70% passing score. Weather-related topics and airspace regulations historically carry the most questions. FAA test prep resources: faa.gov — Knowledge Test Information

Knowledge Areas

Section 61.105(b) covers: applicable FARs, national airspace system, meteorology and meteorological services, aircraft systems and instruments, performance and limitations, weight and balance, navigation (pilotage, dead reckoning, radio navigation), radio communications, aeronautical decision-making and risk management, preflight action, and aerodynamics principles.

Regulatory Cross-References

• 14 CFR § 61.35 — knowledge test prerequisites: instructor endorsement required
• 14 CFR § 61.37 — knowledge test conduct requirements
• AC 61-65K — endorsement wording (Appendix 1, endorsement A-32)
• AIM Chapter 3 — airspace classifications cross-referenced

Source: 14 CFR § 61.105 — eCFR.gov

The PPL Knowledge Test Domains — § 61.105 Decoded

Many students treat § 61.105 like a syllabus checklist — a list of topics ground school has to cover and the FAA's question bank gets to draw from. That is not wrong, but it misses the structure. Paragraph (a) states how a person may study (instructor-logged ground training OR a home-study course). Paragraph (b) states what — thirteen knowledge areas the rule names individually. The PPL Airplane knowledge test (the FAA calls it the PAR — Private Airplane Recreational/Private) is 60 multiple-choice questions, drawn from a public question bank, and a score of 70% is required to pass. The thirteen areas below are the bank; the PAR is the evaluation.

Two source documents the FAA expects applicants to know thoroughly by the time they sit the PAR: the Pilot's Handbook of Aeronautical Knowledge (PHAK, FAA-H-8083-25) and the Airplane Flying Handbook (AFH, FAA-H-8083-3). Both are free PDFs at faa.gov. The PHAK is the textbook for the knowledge test. The AFH is the textbook for the practical. Most missed test questions trace back to a paragraph in one of those two books that was skimmed instead of read.

What an Examiner Asks About § 61.105

61.105 itself rarely comes up by section number — DPEs ask about the knowledge areas, not the rule that lists them. But the question pattern is predictable:

• "What knowledge areas does the PPL require?" All thirteen verbatim are not needed. Grouping works: regs, weather, navigation/charts, performance & W&B, aerodynamics & systems, ADM, preflight planning. Covering those buckets covers (b)(1) through (b)(13).
• "What's the PHAK?" The Pilot's Handbook of Aeronautical Knowledge — FAA-H-8083-25. The primary textbook for everything in 61.105(b). An applicant who cannot name it signals study from a test-prep app instead of the source.
• "How was the PAR studied for?" A realistic answer: ground school plus a question bank app (Sheppard Air, King Schools, Sporty's). The DPE is not grading the study method — only checking that the applicant can name a real path.
• "What's the passing score?" Seventy percent. 42 of 60 questions correct.
• The trick question: "Is NTSB Part 830 in the FARs?" No. The National Transportation Safety Board's rules live under Title 49 of the CFR — not Title 14. But 61.105(b)(2) makes Part 830 required PPL knowledge anyway. Applicants who assume "FARs = everything" miss this one. It lives outside the FARs but inside the applicant's responsibility.

Preparing for the PPL Knowledge Test, Under § 61.105

Consider an applicant roughly three weeks from the checkride. Ground school is done. Most of the practical maneuvers have been flown. The PAR is the last gate before scheduling the practical — here is how to approach it.

Step one: take a full-length practice test cold. Without studying first: 60 questions, 2.5 hours, the same conditions as the real test. Whatever score results is an honest baseline. Well-prepared applicants commonly land somewhere in the high 70s to low 80s on a cold run.

Step two: map the misses back to § 61.105(b). Every wrong answer slots into one of the thirteen areas. Tallying them shows the pattern. If eight of twelve misses are weather, the weak area is (b)(6), not "the test" generally. The next week can go toward reading PHAK Chapter 12 and decoding twenty METARs/TAFs a day. If the misses cluster in W&B, working through five sample CG problems a night makes the math automatic.

Step three: repeat until practice-test scores sit consistently at 85%+, then schedule the PAR at a PSI testing center. A reasonable standard is clearing 85% on at least three different full-length practices before taking the real test. The 70% line is the FAA's floor, not the target. Scoring in the 90s leaves room.

Step four — the one many new pilots miss — bring the knowledge-test score sheet to the practical. 14 CFR § 61.43 and the Airman Certification Standards require the DPE to review the knowledge-test report and quiz the applicant on every area where a question was missed. If the sheet shows a weak area in "weather information" and the applicant cannot explain what an AIRMET Tango is, that can mean busting the ground portion before the airplane is touched. Knowing what was missed matters. Re-reading those PHAK chapters the night before the practical, and walking in able to explain every wrong answer, is the safe approach.

The PAR is not a hurdle to clear and forget. It tells the DPE exactly where to dig.