FAA Powerplant Written Practice Test

How are discharge nozzles in a fuel injected reciprocating engine identified for their flow range?

1. Color-coded markings on the nozzle

2. By an identification letter stamped on the nozzle body

3. Numerical sizes printed on the body

4. By manufacturer specifications

The correct answer is: By an identification letter stamped on the nozzle body

Discharge nozzles in a fuel-injected reciprocating engine are identified for their flow range primarily by an identification letter stamped on the nozzle body. This identification system allows for a standardized method of categorizing nozzles based on their flow characteristics, which is crucial for ensuring that the engine receives the correct amount of fuel under varying operating conditions. Using identification letters is beneficial because it provides a clear and concise reference that can be easily understood by technicians and mechanics when troubleshooting or replacing components. This system also aids in maintaining compatibility with different engine models, contributing to operational efficiency and safety in aircraft systems. While other identification methods such as color-coding, numerical sizes, or manufacturer specifications may provide additional information, the stamped identification letters are specifically designed to convey critical flow range information directly associated with the nozzle’s performance in the engine.