Fuel scheduling during APU start and under varying pneumatic bleed and electrical loads is maintained

Fuel scheduling during APU start and under varying pneumatic bleed and electrical loads is maintained

• A. Automatically by the APU fuel control system
• B. Manually through power control lever position
• C. Automatically by the aircraft main engine fuel control
• D. Automatically by the bleed air system

Answer: (A)

Automatic control of fuel flow by the APU fuel control system maintains the correct fuel schedule during start and as bleed air and electrical loads vary. The APU control unit meters fuel to keep the APU at its target speed, responding to changes in load from pneumatic systems (like air conditioning packs and other bleed demands) and electrical generation. This automatic adjustment ensures a smooth start and stable operation without manual intervention. Manual adjustment through a power control lever wouldn’t reliably compensate for rapid load changes, and the main engine fuel control or the bleed air system don’t manage the APU’s fuel schedule.

Automatic control of fuel flow by the APU fuel control system maintains the correct fuel schedule during start and as bleed air and electrical loads vary. The APU control unit meters fuel to keep the APU at its target speed, responding to changes in load from pneumatic systems (like air conditioning packs and other bleed demands) and electrical generation. This automatic adjustment ensures a smooth start and stable operation without manual intervention. Manual adjustment through a power control lever wouldn’t reliably compensate for rapid load changes, and the main engine fuel control or the bleed air system don’t manage the APU’s fuel schedule.