The primary purpose of a fuel tank sump is to provide a

Question

BlackTom AI · Accepted Answer

A fuel tank sump provides a low point in the tank where water and particulate contaminants collect so they can be removed by draining.

1) Relevant knowledge points and concepts:
- Fuel is less dense than water; any free water in a tank will settle to the lowest point.
- Contaminants and sediment also tend to accumulate at low points.
- A sump (drain) is an intentionally designed lowest area with a drain valve or drain fittings to permit removal of water and debris during servicing or preflight checks.
- The sump is not designed as a usable fuel reserve or as part of an automated fuel-management system.

2) Step-by-step reasoning process:
Step 1: Recognize that free water and dirt in fuel tanks are hazardous (can clog filters, feed water to engines, cause flameouts).
Step 2: Determine where those contaminants will gather—because water is heavier than fuel, it migrates to the tank’s lowest point.
Step 3: Identify the purpose of a sump—provide an accessible low point with drain fittings so ground crews or pilots can check for and remove water/contaminants.
Step 4: Conclude that the primary function is collection and drainage of contaminants, not storage or fuel-level control.

3) Intermediate steps/details (design and procedure):
- Sumps are located at the tank’s lowest geometry.
- During preflight, pilots drain small amounts from the sump and inspect for water (clear separation or droplets) and sediment.
- Maintenance drains remaining contaminants during servicing.

4) Why the correct answer is correct:
Because the sump’s geometry and fittings are specifically intended to let heavier water and solids collect at an accessible point for removal, preventing those contaminants from entering fuel lines or pumps.

5) Why the other options are incorrect:
- “Reserve supply of fuel” is incorrect: a sump contains only a small amount and is not intended as usable reserve fuel for landing.
- “Positive system of maintaining minimum fuel” is incorrect: that describes fuel transfer, pumps, or management systems, not a passive drain designed for contamination removal.

6) Conclusion:
Therefore, the primary purpose of a fuel tank sump is to provide a place where water and dirt accumulations in the tank can collect and be drained, which matches the provided answer.

The primary purpose of a fuel tank sump is to provide a 单项选择题

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