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What is MHMEB?
Hot bearing in main engine
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What are the indications of MHMEB?
- Rapid rise in main bearings (1-9) high temp alarm 194 F
- Rapid rise in thrust bearings high temp alarm 165 F
- Journal bearing temp spread between main bearing 1-9 exceeds 20 F
- Babbitt or foreign matter discovered in L/O strainers.
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NOTE: What max temp spread for Journal Bearings to be considered a HOT main engine bearing?
20 F
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NOTE: What temp do thrust bearings operate due to its location outside the engine sump?
15-20 F less than journal bearing
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NOTE: What temp is considered a controllable hot main engine bearing temp?
- 1-9 journal bearing: 15-19 F
- Individual journal bearing: less than 194 F
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NOTE: What temp is considered an uncontrollable hot main engine bearing temp?
- 1-9 journal bearing: 20 F or more
- Individual journal bearing: 194 or above
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NOTE: What is considered an uncontrollable hot bearing for the thrust bearing?
165 F
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NOTE: AHD 1/3 on program mode, full power, split plant, and trail shaft corresponds to what shaft rpm?
64 rpm
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NOTE: AHD 1/3 full power and split plant corresponds to what pitch?
49%
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How many degrees increase from the last recorded reading during steady state operations to take controlling actions?
15 F
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What are the Controlling Actions of the PACC?
- EOOW, hot main engine bearing _ main engine.
- Shift thrust control to CCS
- Slow both shafts in standard speed decrements and continue to monitor bearing temperature until AHD 1/3 is obtained. If temp continues to rise and/or exceeds 194 F, proceed to Immediate Actions.
- EOOW, _ main engine bearing temp stable at _ F.
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What are the Controlling Actions of the EOOW?
- IMC, Hot bearing, _ main engine. CRT, lay to (space).
- OOD, hot main engine bearing _ main engine; shifting thrust control from pilothouse to CCS. Slowing both shafts in standard speed decrements to AHD 1/3.
- Order PACC to shift thrust control to CCS and slow both shafts in standard speed decrements of AHD 1/3
- OOD, _ main engine bearing temperature stable at _ F. Maximum speed available _ knots.
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What are the Controlling Actions of the Rover/CRT?
Manned and ready.
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What are the Immediate Actions of the PACC?
- EOOW, _ main engine bearing temp uncontrollable; stopping/E-stopping _ main engine.
- E-stop affected shaft
- Stop affected main engine. Verify clutch disengages
- Place affected shaft in trailing mode
- EOOW, thrust control shifted from pilothouse to CCS. _ main engine stopped; clutch disengaged, _ shaft trailing, ECS is in trailing mode.
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What are the Immediate Actions of the EOOW?
- CRT report status
- OOD, _ main engine bearing temp uncontrollable; stopping _ main engine.
- OOD, _ main engine stopped and shaft trailing. Thrust control shifted to CCS. Maximum speed available _ knots.
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What are the Immediate Actions of the Rover/CRT?
- Manned and ready.
- Verify _ main engine clutch has automatically disengaged, if not, manually disengage/dump _ clutch.
- EOOW, _ main engine clutch is disengaged
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