START VALVE OPEN amber light indicates?

• A. The start valve is closed and air is not supplied to the starter.
• B. The start valve is open and air is supplied to the starter.
• C. The engine is not ready.
• D. The starter is inoperative.

Answer: (B)

The starting concept is that the start valve controls bleed air to the pneumatic starter. When the amber light shows the start valve is open, it means bleed air is being fed to the starter, so the starter is able to spin the engine for starting. In other words, air is flowing to the starter and the engine can be started. If the valve were closed, no air would reach the starter and starting wouldn’t occur. This light doesn’t alone confirm engine readiness or indicate a starter fault; those states are shown by other indicators.