If the fuel filter clogs, which indicators or actions occur?

• A. Bypass indicator pops out
• B. Bypass valve opens
• C. Both the bypass indicator pops out and the bypass valve opens
• D. No effect

Answer: (C)

When a fuel filter becomes clogged, the system is designed to keep fuel flowing by diverting it around the blocked element. A bypass valve opens to route fuel past the clogged filter, driven by the pressure drop across the filter reaching a threshold. At the same time, the bypass indicator pops out to warn the crew that the bypass path is in use. So, both events occur: the valve opens to maintain fuel flow, and the indicator signals that bypass is active. This ensures the engine continues to receive fuel, though unfiltered, until the clogged filter can be replaced at the next opportunity.