What is the pre-charge pressure for the brake accumulator on a 737-800?

The pre-charge pressure for the brake accumulator on a Boeing 737-800 is 1,000 psi. This pressure ensures that the accumulator is adequately charged with nitrogen, enabling it to store hydraulic energy for the braking system operation. When the brake system is engaged, the accumulator releases this stored energy to assist in providing braking pressure, particularly during normal operations or in case of a failure in the hydraulic system.

Having the correct pre-charge pressure is crucial, as it affects the brake system's responsiveness and overall functionality. If the pre-charge pressure is too low, the accumulator will not function effectively, potentially leading to insufficient braking force. Conversely, if the pressure is too high, it could lead to excessive wear on components or system failures. Therefore, knowing that 1,000 psi is the standard ensures optimal performance of the aircraft’s braking capabilities.