Which condition occurs when the manifold pressure exceeds the manufacturer's limit?

• A. Overboost
• B. Overdrive
• C. Overpower
• D. P-static

Answer: (A)

Overboost is the condition where the pressure in the intake manifold exceeds the maximum value the engine is allowed to operate with. The manifold pressure gauge shows how much boost the engine is getting from the turbocharger or supercharger, and when that pressure goes beyond the manufacturer’s limit, cylinder pressures can rise too high, increasing the risk of engine damage and detonation. To address this, reduce power or boost to bring MAP back within the approved range. P-static measures ambient static pressure and is not related to engine boost. The terms overdrive and overpower don’t describe this specific MAP-overlimit situation in aviation practice.