What is the pressure tolerance of the T-6B hydraulic system's normal operating pressure?

• A. +/- 50 psi
• B. +/- 120 psi
• C. +/- 150 psi
• D. +/- 225 psi

Answer: (B)

Understanding how hydraulic pressure tolerance works helps here: the system runs at a nominal operating pressure, but it won’t be perfectly constant due to pump speed variations, fluid temperature changes, viscosity shifts, and different actuator loads. The tolerance defines the acceptable window around that nominal value where the system is still considered healthy. For the T-6B hydraulic system, about ±120 psi provides a realistic balance—small enough to catch genuine issues but large enough to accommodate normal operating fluctuations. A much tighter tolerance (like ±50 psi) would be too sensitive to normal changes, while a looser one (±150 or ±225 psi) could hide faults or lead to unsafe operation. So the ±120 psi range best matches how the system behaves in practice.