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Questions and Answers
What is the primary function of the scavenge pumps in an engine lubrication system?
What is the primary function of the scavenge pumps in an engine lubrication system?
- To filter the oil before it enters the engine, ensuring only clean oil lubricates the components.
- To cool the oil as it circulates through the engine, preventing overheating.
- To remove oil from the engine bearing chambers and gearboxes and return it to the oil tank. (correct)
- To pressurize the oil before it enters the engine bearings.
How are the nine scavenge pumps driven within the engine's oil system?
How are the nine scavenge pumps driven within the engine's oil system?
- A series of belts connect each pump to the engine's main crankshaft.
- They are driven by the flow of oil through the system, using turbine-like impellers.
- They are driven by a common drive shaft that also drives the pressure pump. (correct)
- Each pump has its own dedicated electric motor.
What is the purpose of the strainer located at the inlet of each scavenge pump?
What is the purpose of the strainer located at the inlet of each scavenge pump?
- To prevent debris from entering the pump. (correct)
- To regulate the oil pressure entering the pump.
- To cool the oil before it enters the pump, preventing overheating.
- To measure the flow rate of oil entering the pump.
What happens when the scavenge filter in the Oil Debris Monitoring System (ODMS) becomes completely blocked with debris?
What happens when the scavenge filter in the Oil Debris Monitoring System (ODMS) becomes completely blocked with debris?
How does the Engine Electronic Controller (EEC) monitor the condition of the scavenge filter in the Oil Debris Monitoring System (ODMS)?
How does the Engine Electronic Controller (EEC) monitor the condition of the scavenge filter in the Oil Debris Monitoring System (ODMS)?
Flashcards
Scavenge Pumps
Scavenge Pumps
Pumps that remove oil from engine bearing chambers/gearboxes and return it to the oil tank.
Scavenge Pump Location
Scavenge Pump Location
Located within the oil pump assembly.
Scavenge Pump Drive
Scavenge Pump Drive
Driven by a common driveshaft that also drives the pressure pump.
Oil Debris Monitoring System (ODMS)
Oil Debris Monitoring System (ODMS)
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ODMS Components
ODMS Components
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Study Notes
Oil Scavenge Pumps
- Scavenge pumps are located within the oil pump assembly.
- They remove oil from engine bearing chambers and gearboxes, returning it to the oil tank.
- Nine scavenge pumps are driven by a common drive shaft, which also drives the pressure pump.
- The driveshaft is splined and locates into the external gearbox
- During engine operation, scavenge pumps remove oil from bearing chambers and gearboxes, returning it to the oil tank.
- Each scavenge pump directs oil into a common return to the oil tank.
- A strainer at the inlet of each scavenge pump prevents debris from entering the pump.
Oil Debris Monitoring System (ODMS)
- The ODMS is located on the side of the oil tank.
- Its purpose is to collect and monitor debris from the scavenge oil flow returning to the oil tank.
- Consists of: a tubular housing, an oil debris sensor (ODS), a scavenge filter, a scavenge filter bypass valve, and a scavenge filter pressure differential transducer.
- It separates and monitors debris from the scavenge oil before it enters the oil tank.
- The tubular housing separates debris from the scavenge oil flow before the scavenge filter.
- Debris collected in the tubular housing is monitored by the ODS as part of the EHM system.
- The disposable scavenge filter collects debris in the oil flow before the oil enters the tank.
- The scavenge filter is located within a yellow removable cover attached to the ODMS tubular housing.
- The scavenge filter bypass valve is located at the top of the scavenge filter.
- The scavenge filter bypass valve opens when the filter is completely blocked with debris, allowing oil to bypass the filter.
- A differential pressure transducer monitors the condition of the scavenge filter through the EEC.
- The differential pressure transducer provides the cockpit with an indication of an impending filter blockage.
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Description
Scavenge pumps, located within the oil pump assembly, remove oil from engine bearing chambers and gearboxes, returning it to the oil tank. The Oil Debris Monitoring System (ODMS) collects and monitors debris from the returning scavenge oil flow.
