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Class 4 (4th Engineer) MEKM 📅 Mar 2023

Exam Question

(a) What are the safety interlocks provided in compressed air starting system of main engine? (8)

(b) Describe with a diagram the air starting system of a main engine (8)

Exam question diagram

Reference Answer

### (a) Safety Interlocks in a Main Engine Compressed Air Starting System (8 Marks)
Safety interlocks are critical systems designed to prevent engine operation under unsafe conditions, protecting both personnel and machinery from catastrophic failure. A comprehensive set of interlocks is fitted to the main engine starting system. The primary interlocks and their functions are as follows:
1. **Turning Gear Interlock:**
* **Purpose:** This is the most critical mechanical interlock. It physically prevents the admission of starting air to the engine while the turning gear is engaged with the flywheel.

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