The Fuel Feed and Drain System provides a signal to the FADC/LOCOP when the fuel manifold pressure falls below which value?

The Fuel Feed and Drain System provides a signal to the FADC/LOCOP when the fuel manifold pressure falls below which value?

• A. 100 psig
• B. 150 psig
• C. 200 psig
• D. 250 psig

Answer: (B)

Fuel manifold pressure is a direct indication of how much fuel is actually available to the engine. When that pressure drops to 150 psig, the Fuel Feed and Drain System sends a signal to the FADC/LOCOP to warn that fuel is not reaching the engine as it should. That signal prompts protective actions in the fuel control system and informs the crew, helping prevent fuel starvation from damaging the engine. The 150 psig threshold is chosen to provide timely protection: high enough to catch impending fuel issues early, but not so sensitive that normal pressure fluctuations cause unnecessary alarms. If the threshold were set much lower, like 100 psig, warnings could come too late; if it were higher, such as 200 or 250 psig, alerts could occur during normal operation.

Fuel manifold pressure is a direct indication of how much fuel is actually available to the engine. When that pressure drops to 150 psig, the Fuel Feed and Drain System sends a signal to the FADC/LOCOP to warn that fuel is not reaching the engine as it should. That signal prompts protective actions in the fuel control system and informs the crew, helping prevent fuel starvation from damaging the engine. The 150 psig threshold is chosen to provide timely protection: high enough to catch impending fuel issues early, but not so sensitive that normal pressure fluctuations cause unnecessary alarms. If the threshold were set much lower, like 100 psig, warnings could come too late; if it were higher, such as 200 or 250 psig, alerts could occur during normal operation.