What is the minimum bleed air pressure required for engine start?

The minimum bleed air pressure required for engine start is 45 psi plus/minus 3. This specific pressure range is crucial as it ensures that there is sufficient pneumatic pressure available to start the engine efficiently. Bleed air is used to drive the engine's starter, and inadequate pressure could result in a failed start or damage to the starting system.

Maintaining the required pressure range is essential for optimal starting conditions. When bleed air pressure falls below this recommended level, it may not provide enough energy to engage the starter properly, impacting the overall reliability of the engine start sequence. Thus, knowing the correct minimum pressure helps ensure a safe and successful engine start.