Q2
With reference to bridge control of a large slow speed propulsion engine:
(16)
(a) How is starting and reversing achieved?
(b) Investigate and suggest remedial action required if the engine
(i) Fails to turn on air
(ii) Turns on air but fails to fire on fuel
(iii) Fails to reverse
Reference Answer
### (a) Starting and Reversing of a Large Slow-Speed Propulsion Engine Starting and reversing a modern large slow-speed engine from the bridge is a highly automated process managed by a sophisticated control system. The sequence involves a series of safety checks (interlocks), mechanical or electronic adjustments for direction, and the controlled admission of high-pressure air followed by fuel. #### 1. Initiation of Command The process begins when the bridge officer moves the engine telegraph lever to the desired speed and direction (e.g., Dead Slow Ahead). This sends an electrical signal to the Engine Control Room (ECR) console and the Main Engine Control Unit (MECU).
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