During the watch the main engine crankcase mist detector alarm has sounded; what steps do you take?
Short answer
- Acknowledge: confirm alarm at main machinery control station, verify genuine
- Engine action: reduce load, stop if mist density rises/persists, do NOT open crankcase doors
- Isolate: keep crankcase sealed to exclude air
- Alarms: audible/visual at main machinery control station, another manned station, and bridge in marine mode (A.1023(26) ch-8 §8.7.1)
- Safety: prepare fixed fire-fighting media, account for personnel
- Cooling: wait sufficient time before opening crankcase
- Inspect: open crankcase per maker’s procedure/permit-to-work, check bearings/crankshaft/connecting rods/sump
- Rectify: replace damaged components, restore lube-oil flow/pressure, verify oil condition
- Detector: clean lens/sampling tube, verify function, reset after cause rectified
- Restart: start engine, monitor oil-mist detector and bearing temperatures
Full answer
The full answer explains each point step by step, with the regulations and figures behind it and the discussion from other candidates. It is in the MEO Class IV section of the Marine One forum, open to members enrolled for the MEO Class IV exam.