The PTU will kick in if yellow/green pressure exceeds:

The PTU will kick in if yellow/green pressure exceeds:

• A. 500psi
• B. 450psi
• C. 600psi
• D. 550psi

Answer: (A)

The Power Transfer Unit automatically engages when the difference between the yellow and green hydraulic pressures reaches a set threshold, to keep essential hydraulic power available to the green system. For this configuration, that threshold is 500 psi, so when yellow pressure exceeds green pressure by about 500 psi, the PTU kicks in and transfers hydraulic power to support the green system. This design prevents loss of control authority when one system is low, by using the higher-pressure side to bolster the lower-pressure side. The other numbers would indicate a different activation point not used by this aircraft’s setup.

The Power Transfer Unit automatically engages when the difference between the yellow and green hydraulic pressures reaches a set threshold, to keep essential hydraulic power available to the green system. For this configuration, that threshold is 500 psi, so when yellow pressure exceeds green pressure by about 500 psi, the PTU kicks in and transfers hydraulic power to support the green system. This design prevents loss of control authority when one system is low, by using the higher-pressure side to bolster the lower-pressure side. The other numbers would indicate a different activation point not used by this aircraft’s setup.