Aircraft systems and instrumentsQuestion 627 of 934

What do the green and red marks on an oil pressure gauge show?

  1. Green marks the minimum; red marks the normal range
  2. Green marks the maximum; red marks the minimum
  3. Both show the normal range for different rpm
  4. Green is normal range; red marks the pressure limits
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Correct answer: Green is normal range; red marks the pressure limits

There should be an indication of oil pressure during engine start.

Source: Pilot's Handbook of Aeronautical Knowledge (FAA-H-8083-25C), Chapter 7: Aircraft Systems — Oil Systems, page 176

Practice aircraft systems and instruments

Questions last reviewed: 18 October 2026