What is the primary role of the Fuel Flow Transmitter in the fuel flow indicating system?

• A. To display fuel flow in pounds-per-square-inch
• B. To provide an electrical signal proportional to the mass rate of fuel flow
• C. To detect fire in the engine compartment
• D. To illuminate the flight station's fire warning light

Answer: (B)

The primary role of the Fuel Flow Transmitter in the fuel flow indicating system is to provide an electrical signal that is proportional to the mass rate of fuel flow. This functionality is essential for accurately measuring the amount of fuel being supplied to the engine, which is critical for efficient operation and performance.

By converting the physical flow of fuel into an electrical signal, the transmitter allows the aircraft's instrumentation to display real-time data regarding fuel consumption. This information is vital for pilots and engineers to monitor fuel usage and manage the aircraft’s fuel strategy effectively. Understanding the mass flow is also important for calculating the aircraft's performance and fuel economy, which are crucial for flight planning and operational efficiency.

The other choices do not relate to the core purpose of the Fuel Flow Transmitter; for example, displaying fuel flow in pounds-per-square-inch pertains to pressure measurement rather than flow rate, while fire detection and warning light illumination are functions of different systems that deal with safety rather than fuel flow measurements.