Class 4 (4th Engineer) MEKM 📅 Jan 2023

Exam Question

During your watch, main engine operation suddenly becomes erratic with speed varying widely even though fuel control remains at the value originally set:

(a) State with reasons the possible cause of this behaviour; (8)

(b) Explain in detail how this cause can be traced and the problems rectified. (8)

Reference Answer

### (a) Possible Causes of Erratic Main Engine Speed
Erratic engine speed, where RPM fluctuates widely despite a constant fuel control setting, points to an unstable equilibrium between power generation and the propeller load. This instability is typically caused by inconsistencies in the combustion process or a malfunction in the speed control system. The primary possible causes are:
1. **Fuel System Contamination or Interruption:** This is the most common category of faults.
* **Water in Fuel Oil:**

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