Preflight lubrication checks include which item?

Preflight lubrication checks include which item?

• A. Quantity of the lubricating oil for the engine and the constant-speed drive unit
• B. Oil color
• C. Oil brand
• D. Oil temperature

Answer: (A)

Checking the oil quantity for both the engine and the constant-speed drive unit is the essential focus of preflight lubrication checks. The amount of oil must be within the specified range to ensure there’s enough lubrication during starting and flight, protecting bearings and gears from wear or seizure. If oil is low, moving parts can overheat and fail; if it’s over the limit, it can cause foaming or leaks. Oil color and oil brand don’t reliably indicate oil condition or suitability for the current flight, and they aren’t used to determine whether the lubrication system is ready for flight. Oil temperature is something you assess after the engine is running, not before start, so it isn’t part of the preflight check. In practice you’d verify the oil quantity with the dipstick (for both the engine and any approved drive unit) and look for signs of leaks or contamination as part of the overall lubrication check.

Checking the oil quantity for both the engine and the constant-speed drive unit is the essential focus of preflight lubrication checks. The amount of oil must be within the specified range to ensure there’s enough lubrication during starting and flight, protecting bearings and gears from wear or seizure. If oil is low, moving parts can overheat and fail; if it’s over the limit, it can cause foaming or leaks.

Oil color and oil brand don’t reliably indicate oil condition or suitability for the current flight, and they aren’t used to determine whether the lubrication system is ready for flight. Oil temperature is something you assess after the engine is running, not before start, so it isn’t part of the preflight check. In practice you’d verify the oil quantity with the dipstick (for both the engine and any approved drive unit) and look for signs of leaks or contamination as part of the overall lubrication check.