What are the two types of fuel injection systems used on modern reciprocating aircraft engines?

What are the two types of fuel injection systems used on modern reciprocating aircraft engines?

• A. Teledyne Continental system
• B. Teledyne Continental (TCM) system and Precision Airmotive (Bendix) system
• C. Bosch and Bendix
• D. Continental and Lycoming

Answer: (B)

Two continuous-flow fuel injection systems are used on modern piston aircraft engines, coming from the two main suppliers: Teledyne Continental Motors (TCM) and Precision Airmotive (Bendix). The Teledyne Continental system meters fuel with a dedicated fuel/air control unit powered by the engine, sending a metered flow through a flow divider to individual discharge nozzles in each cylinder. In contrast, the Precision Airmotive Bendix RSA system uses a servo-type regulator that responds to the amount of air flowing through the intake (via a venturi) to meter fuel; that fuel then goes through a flow divider to the cylinder nozzles. Both systems continuously spray fuel into the intake to mix with air, but they achieve metering with different mechanisms: TCM relies on its control unit’s metering arrangement, while Bendix RSA uses an airflow-sensing servo to regulate fuel flow. The other options refer to brands or engine manufacturers rather than the two primary system families in use today.

Two continuous-flow fuel injection systems are used on modern piston aircraft engines, coming from the two main suppliers: Teledyne Continental Motors (TCM) and Precision Airmotive (Bendix). The Teledyne Continental system meters fuel with a dedicated fuel/air control unit powered by the engine, sending a metered flow through a flow divider to individual discharge nozzles in each cylinder. In contrast, the Precision Airmotive Bendix RSA system uses a servo-type regulator that responds to the amount of air flowing through the intake (via a venturi) to meter fuel; that fuel then goes through a flow divider to the cylinder nozzles. Both systems continuously spray fuel into the intake to mix with air, but they achieve metering with different mechanisms: TCM relies on its control unit’s metering arrangement, while Bendix RSA uses an airflow-sensing servo to regulate fuel flow. The other options refer to brands or engine manufacturers rather than the two primary system families in use today.