FAA Aviation Mechanic Powerplant (AMP)Fuel, Induction and LubricationEasy
A mechanic is performing a pre-flight inspection on a reciprocating engine aircraft. What is the primary purpose of checking the fuel strainer sump drain?
- ATo check for proper fuel pressure before engine start.
- BTo remove any accumulated water and sediment from the fuel system.
- CTo verify the fuel quantity indicated on the cockpit gauge.
- DTo ensure proper operation of the engine-driven fuel pump.
Show answer & explanationAnswer & explanation
Correct answer: B. To remove any accumulated water and sediment from the fuel system.
Checking the fuel strainer sump drain primarily serves to remove any water or sediment that may have settled in the lowest point of the fuel system. Water is denser than fuel and can cause engine stoppage if ingested.
Why the other options are wrong
- A. Fuel pressure is checked with a gauge, usually after the engine is running or boost pump is activated, not by draining the sump.
- C. Fuel quantity is checked via gauges or visual inspection, not the sump drain.
- D. Fuel pump operation is typically checked during engine start or specific system tests, not by draining the sump.
Fuel Sump Drain Check
A pre-flight procedure to remove water and sediment from the lowest point of an aircraft's fuel system to prevent engine issues.
- Water is heavier than fuel and settles at the bottom.
- Sediment can clog fuel lines and filters.
- Essential for safe flight operations.
Memory trick: Water & sediment sink, so drain to think clear.