The threshold for Auto Cross Flow activation is 200 pounds, and it results in the low tank becoming how many pounds heavier than the other after fueling?

The threshold for Auto Cross Flow activation is 200 pounds, and it results in the low tank becoming how many pounds heavier than the other after fueling?

• A. 25
• B. 50
• C. 75
• D. 100

Answer: (B)

Balancing fuel between the left and right wing tanks is done by Auto Cross Flow during fueling. When the difference between tank quantities reaches the activation threshold of 200 pounds, the crossflow valve opens and fuel moves from the fuller tank to the lighter one to reduce that imbalance. This crossflow continues until a small residual difference is left, which is how the system prevents overcorrecting. In the CRJ-550, the residual imbalance after fueling with crossflow active is 50 pounds. Therefore, the low tank ends up about 50 pounds heavier than the other tank after fueling.

Balancing fuel between the left and right wing tanks is done by Auto Cross Flow during fueling. When the difference between tank quantities reaches the activation threshold of 200 pounds, the crossflow valve opens and fuel moves from the fuller tank to the lighter one to reduce that imbalance. This crossflow continues until a small residual difference is left, which is how the system prevents overcorrecting.

In the CRJ-550, the residual imbalance after fueling with crossflow active is 50 pounds. Therefore, the low tank ends up about 50 pounds heavier than the other tank after fueling.