Pilot Foundations · Source-checked
Piston engine, fuel and electrical basics
Learning goals
- Describe the purpose of mixture, carburetor heat or fuel injection
- Know where aircraft-specific system details come from
Most training aircraft use four-stroke reciprocating engines. Mixture controls the fuel-air ratio, which must be leaned as air density falls. Carburetor ice forms from fuel vaporization and pressure drop in the venturi; the handbook says it is most likely below about 70°F (21°C) with relative humidity above 80 percent. Fuel injection is less susceptible to icing (impact icing is still possible) but can be harder to start hot and prone to vapor lock on hot days on the ground.
Electrical systems usually combine a battery and an alternator, with a master switch and an ammeter or load meter to monitor charging. Every model differs. The handbook teaches the concepts; the approved AFM/POH and the aircraft's own placards describe the real system you will fly. This course does not describe any specific GA-7 system.
Assigned reading
Pilot's Handbook of Aeronautical Knowledge (FAA-H-8083-25C (2023) with MOSAIC addendum (Oct 2025))
Chapter 7: Aircraft Systems (powerplant, carburetor icing, fuel injection, electrical) · Federal Aviation Administration · reviewed 2026-10-21
Self-check
Original practice questions for self-assessment only — not FAA test questions and not a certification.
Study preparation only. Not FAA-approved ground training, no endorsement, logbook or flight-time credit, and no guaranteed test result. Always follow your instructor and the approved AFM/POH for your aircraft.