NCAA PPL Aircraft General Knowledge
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ExploreAbout this exam
The NCAA Private Pilot Licence Aircraft General Knowledge knowledge test is one of the ground examinations a candidate must pass before applying for a Nigerian private pilot licence. It is administered by the Nigeria Civil Aviation Authority, which regulates aviation in Nigeria under the Civil Aviation Act and publishes its syllabi and requirements for all knowledge tests in Advisory Circular NCAA-AC-PEL 018, found under Personnel Licensing Advisory Circulars on ncaa.gov.ng. The test is multiple choice and is delivered in English. It covers aircraft general knowledge in the broad sense: airframe structure and components, aircraft systems such as fuel, electrical, hydraulic, pneumatic, ice and fire protection, flight controls, landing gear and pressurisation; the powerplant, including piston engine principles, carburation, ignition, cooling, lubrication and propellers; and flight instruments, including pitot-static and gyroscopic instruments and their failure modes. You must score at least 75% to pass, and a pass is valid for 24 calendar months from the date the result is issued, so plan the remaining ground tests and the flight test around that window. Applications to sit knowledge tests are submitted at the Authority's headquarters in Abuja or at the regional offices in Lagos, Kaduna and Enugu. Preparation should combine a current PPL ground-training textbook for systems and instruments, the applicable Nig. CARs 2023 provisions on instruments and equipment, and repeated practice questions on system purpose, component function and instrument error recognition. This page is an independent study resource and is not affiliated with or endorsed by the NCAA.
What you'll study
About NCAA PPL Aircraft General Knowledge preparation
What score do I need to pass the NCAA Aircraft General Knowledge knowledge test?
The passing grade for NCAA knowledge tests is 75%, as stated in the Authority's published frequently asked questions. There is no partial credit for a strong section: aim to be consistently above 75% on practice sets before booking, because a single weak area such as instruments or electrical systems can pull a borderline score below the line.
How long is my pass valid?
Knowledge test results are valid for 24 calendar months from the date of issuance of the result. That window covers the rest of your ground examinations and the skill test, so if your other subjects or flying hours are behind schedule, check the expiry date before you sit Aircraft General Knowledge.
Where do I apply to take the test?
Applications to take NCAA knowledge tests can be submitted at the Authority's headquarters in Abuja and at the regional offices in Lagos, Kaduna and Enugu. Contact details for the regional offices are published on the NCAA website, and the syllabi and requirements for all knowledge tests are in Advisory Circular NCAA-AC-PEL 018.
What happens if I fail?
Applicants who fail a knowledge test can apply to retake it after presenting evidence of having received additional instructions from an Authorised Instructor in the areas of deficiencies. In practice this means a documented session targeting your weak topics, so keep a record of what you got wrong and have an instructor sign off on the remedial ground instruction.
Where is the official syllabus for this test?
The syllabi and requirements for all knowledge tests are found in Advisory Circular NCAA-AC-PEL 018, located under Personnel Licensing Advisory Circulars on the Authority website at ncaa.gov.ng/documents. Download it and use its aircraft general knowledge objectives as your checklist rather than relying on a generic textbook table of contents.
What does Aircraft General Knowledge actually cover?
Expect airframe structure and controls, hydraulic, pneumatic, electrical, fuel, ice and fire protection systems, landing gear, and the piston powerplant with its carburation, ignition, cooling, lubrication and propeller. Instruments are a large share: pitot-static and gyroscopic instruments, their sources of error, and the indications produced by blockages or failures.
How should I order my study for this subject?
Start with airframe and flight controls so system diagrams make sense, then the powerplant, then systems, and finish with instruments, which draws on everything else. For each system learn purpose, major components, normal indications and the most likely failure. Close with timed mixed sets so recall holds under exam pressure.
What are the most common ways candidates lose marks?
Two patterns dominate. First, memorising component names without understanding what each system does, which collapses on applied questions. Second, weak instrument-failure reasoning, such as confusing a blocked static source with a blocked pitot tube. Also watch unit and terminology slips, and read each stem fully before choosing an option.