What is the maximum engine oil consumption per hour per engine?

What is the maximum engine oil consumption per hour per engine?

• A. 6.4 oz per hour
• B. 4 oz per hour
• C. 8 oz per hour
• D. 10 oz per hour

Answer: (A)

Oil consumption rate is the amount of oil the engine can lose each hour while operating, and the manufacturer sets a maximum to protect lubrication and engine reliability. For the CRJ-550, the limit is 6.4 ounces per hour for each engine. This means every engine must stay at or below that rate; if one engine exceeds it, maintenance must investigate for leaks or excessive wear. Since the limit is per engine, the airplane with two engines could collectively consume up to 12.8 ounces per hour in total, but each engine must individually stay within its 6.4-ounce-per-hour cap. In practice, pilots and maintenance monitor oil quantity over time and note any unusual increase in consumption, which would prompt inspection. The other numbers aren’t the approved maximum for a single engine.

Oil consumption rate is the amount of oil the engine can lose each hour while operating, and the manufacturer sets a maximum to protect lubrication and engine reliability. For the CRJ-550, the limit is 6.4 ounces per hour for each engine. This means every engine must stay at or below that rate; if one engine exceeds it, maintenance must investigate for leaks or excessive wear. Since the limit is per engine, the airplane with two engines could collectively consume up to 12.8 ounces per hour in total, but each engine must individually stay within its 6.4-ounce-per-hour cap. In practice, pilots and maintenance monitor oil quantity over time and note any unusual increase in consumption, which would prompt inspection. The other numbers aren’t the approved maximum for a single engine.