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What is MHLSB?
Hot Line Shaft Bearing
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What are the indications of MHLSB?
- Bearing cover is hot to touch.
- L/O temp above normal for existing load.
- Unusual rise in bearing L/O sump temp, exceeds 165 F.
- Bearing temp exceeds 250 F.
- Unusual noise or vibration in shafting or MRG.
- Babbitt or foreign matter discovered in L/O sample.
- Bearing emitting smoke.
- Bearing high temp alarm 250 F.
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NOTE. What is an uncontrollable hot line shaft bearing?
- Sump temp above 185 F.
- Bearing Babbitt temp 250 F
- If bearing temp cannot be controlled at AHD 1/3.
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NOTE: When to proceed to Immediate Actions?
When bearing temp is uncontrollable.
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What actions to take if the reduction of speed or other means do not stabilize bearing temp?
E-stop shaft
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What is considered a controllable LSB?
- Sump temp below 185 F
- Bearing Babbitt below 250 F
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What are the Controlling Actions of the PACC?
- EOOW, _ LSB overheating.
- Shift thrust control to CCS.
- Slow shaft in standard speed decrements.
- Monitor bearing temp at each speed change.
- EOOW, hot LSB, thrust control shifted to CCS. Shafts slowed to _. Monitoring bearing temp, bearing temp is controllable/uncontrollable.
- When affected bearing temp stabilizes observe and record the SRPM/pitch.
- EOOW, _ shaft, _ LSB temp stable at _ F. SRPM/pitch at _.
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What are the Controlling Actions of the EOOW?
- IMC, Hot line shaft bearing. CRT, lay to (space).
- OOD, Hot line shaft bearing on _ shaft; shifting thrust control to CCS. Slowing both shafts in standard speed decrements.
- OOD, _ shaft, _ LSB temp stable at _ F. maximum speed available _ knots.
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NOTE: What actions to take if LSB L/O sump level cannot be monitored on dip stick?
Proceed to Immediate Actions
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What are the Controlling Actions of the Rover/CRT?
- Manned and ready.
- Set bearing watch.
- Ensure L/O pump level is normal.
- Ensure oil slinger ring is operating properly.
- Monitor and report LSB L/O sump temp.
- Report status of investigation
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What are the Immediate Actions of the PACC?
- EOOW, _ LSB temp uncontrollable, stopping _ shaft.
- E-stop affected shaft.
- Shift thrust control to CCS.
- Stop affected main engine. Verify clutch disengages.
- EOOW, thrust control shifted to CCS. _ main engine stopped, clutch disengaged, _ shaft stopped.
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What are the Immediate Actions of the EOOW?
- OOD, _ LSB temp uncontrollable, stopping _ shaft.
- OOD, _ LSB temp uncontrollable, _ main engine stopped and _ shaft stopped. 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 the air to _ main engine clutch.
- EOOW, _ main engine clutch is disengaged.
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