FAR 61.125 — Commercial Aeronautical Knowledge
FAR 61.125 lists the aeronautical knowledge areas a commercial pilot applicant must study, from regulations and aerodynamics to weight, balance, and ADM.
In Plain English
FAR 61.125 sets the ground training requirements for anyone seeking a commercial pilot certificate. You must either receive and log instruction from an authorized instructor or complete a home-study course covering the knowledge areas that apply to the category and class rating you're after.
The required subject areas include:
- Federal Aviation Regulations relating to commercial pilot privileges, limitations, and flight operations
- NTSB accident reporting requirements
- Basic aerodynamics and principles of flight
- Meteorology, including critical weather, windshear recognition/avoidance, and use of weather reports and forecasts
- Safe and efficient operation of aircraft
- Weight and balance computations
- Use of performance charts and effects of exceeding performance limits
- Aeronautical charts and magnetic compass for pilotage and dead reckoning
- Use of air navigation facilities
- Aeronautical decision making (ADM) and judgment
- Principles and functions of aircraft systems
- Maneuvers, procedures, and emergency operations
- Night and high-altitude operations
- Operating within the National Airspace System
- Flight and ground training procedures for lighter-than-air ratings
This matters because commercial operations demand a deeper, more professional understanding of flying than the private level — these topics form the foundation of the commercial written exam and oral.
Regulation Text
14 CFR § 61.125§ 61.125 Aeronautical knowledge.
(a)A person who applies for a commercial pilot certificate must receive and log ground training from an authorized instructor, or complete a home-study course, on the aeronautical knowledge areas of paragraph (b) of this section that apply to the aircraft category and class rating sought.
(b)(1) Applicable Federal Aviation Regulations of this chapter that relate to commercial pilot privileges, limitations, and flight operations;
(2) Accident reporting requirements of the National Transportation Safety Board;
(3) Basic aerodynamics and the principles of flight;
(4) Meteorology to include recognition of critical weather situations, windshear recognition and avoidance, and the use of aeronautical weather reports and forecasts;
(5) Safe and efficient operation of aircraft;
(6) Weight and balance computations;
(7) Use of performance charts;
(8) Significance and effects of exceeding aircraft performance limitations;
(9) Use of aeronautical charts and a magnetic compass for pilotage and dead reckoning;
(10) Use of air navigation facilities;
(11) Aeronautical decision making and judgment;
(12) Principles and functions of aircraft systems;
(13) Maneuvers, procedures, and emergency operations appropriate to the aircraft;
(14) Night and high-altitude operations;
(15) Procedures for operating within the National Airspace System; and
(16) Procedures for flight and ground training for lighter-than-air ratings.
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1/5
You are flying VFR in Class E airspace at 8,500 feet MSL during the day. What are your minimum visibility and cloud clearance requirements?
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Oral Exam Questions a DPE Might Ask
Q1What are the two acceptable ways to satisfy the ground training requirement for a commercial pilot certificate?
Per FAR 61.125(a), you must either receive and log ground training from an authorized instructor or complete a home-study course covering the required knowledge areas for the category and class sought.
Q2Name several aeronautical knowledge areas required for the commercial certificate.
FAR 61.125(b) requires areas such as applicable FARs, NTSB accident reporting, aerodynamics, meteorology including windshear, weight and balance, performance charts, ADM, aircraft systems, night and high-altitude operations, and procedures for operating in the NAS.
Q3Does FAR 61.125 require training on weather and windshear?
Yes. FAR 61.125(b)(4) specifically requires meteorology training including recognition of critical weather situations, windshear recognition and avoidance, and the use of aeronautical weather reports and forecasts.
Studying for a checkride?
§61.113 Privileges & Limits
Private pilot compensation, pro-rata sharing, and BasicMed limits
§61.57 Recent Flight Experience
90-day passenger, night, and instrument currency rules
§61.89 Student Pilot Limitations
Solo student limits: no passengers, no compensation, minimum visibility
§61.51 Pilot Logbooks
Logging training, aeronautical experience, and recency for certificates
§61.23 Medical Certificate Duration
First-, second-, and third-class medical requirement and validity periods
Instrument Rating Requirements
IFR eligibility and aeronautical experience
Related Sections in Part 61