Exam Question

### (a) Procedure to Stop an Overspeeding Auxiliary Engine
When an auxiliary engine overspeeds and the primary overspeed trip fails to operate, immediate and decisive action is required to prevent catastrophic failure. The following steps should be taken in a logical sequence, escalating from remote to local and from standard to emergency procedures:
1. **Emergency Stop Activation:** The first action should be to operate the remote Emergency Stop push-button, typically located in the Engine Control Room (ECR) and on the local engine control panel. This is designed to override the governor and shut off the fuel supply via a solenoid valve.
2. **Manual Fuel Rack Operation:** If the emergency stop is ineffective, proceed directly to the engine. Manually force the fuel pump rack linkage to the 'zero' or 'no-fuel' position. This physically moves the fuel pump plungers to a position where no fuel is injected. Extreme caution is necessary when approaching a vibrating, overspeeding engine.