When the main engine control system fails and cannot be rectified immediately, the second engineer must act swiftly to ensure the engine's continued operation and the safety of the vessel. The first step is to revert the engine room to regular watchkeeping arrangements, ensuring that there is sufficient manpower to monitor the situation closely. The second engineer should then initiate the changeover to emergency or local manoeuvring control. This involves switching the control from the bridge to the Engine Control Room (ECR) or directly to the local control stand, depending on the vessel's design. Ensure that the telegraph is set to the stop position on both the bridge and in the ECR before proceeding.

Next, the fuel pump control should be switched to manual operation by disengaging the governor linkage. Depending on the engine type, a cone clutch arrangement or mechanical lever may be provided to allow manual control of the fuel rack. The starting handle should be set from "stop" to "start," and the engine starting air supply solenoid valve should be manually activated to start the engine. Once the engine reaches about 10 RPM, the fuel supply should be increased, and the speed should be adjusted using the manual fuel lever or handwheel to achieve the desired RPM. Throughout this process, all engine parameters must be closely monitored and logged to ensure the engine is operating within safe limits. It is also essential to establish and maintain effective communication between the local control stand and the wheelhouse.

During local or emergency manoeuvring, the second engineer should issue clear instructions to the engine room staff to maintain safety and efficiency. First, it should be emphasised that at least two persons must be present in the engine room at all times during this operation. The duty engineer must remain at the local manoeuvring stand, closely monitoring the engine parameters on the gauge board. Effective communication with the wheelhouse is essential, so the duty engineer should establish and maintain a reliable communication link.

Subordinates should be instructed to continuously check temperatures, pressures, and all other parameters locally, reporting any abnormalities immediately to the duty engineer. The local manoeuvring stand must never be left unattended during emergency operations. In case of any uncertainty or difficulties, the duty engineer must not hesitate to call the Second Engineer or the Chief Engineer for assistance.

Finally, the duty engineer should be reminded that most safety systems might be bypassed during emergency operations, which increases the risk of overlooking important parameters. Therefore, extra vigilance is required, and no parameter should be neglected. The second engineer’s instructions should focus on maintaining a safe environment, ensuring all personnel are aware of their roles, and monitoring the engine’s performance to prevent further complications.