Podcast
Questions and Answers
What is the likely cause of increasing RGB oil pressure?
What is the likely cause of increasing RGB oil pressure?
- Debris lodged in the oil galleries (correct)
- Failure of the system pressure relief valve
- Excessive oil flow to the planetary gear system
- Lack of oil mist in the accessory drive train
Where does the oil mist come from to lubricate the accessory drive train?
Where does the oil mist come from to lubricate the accessory drive train?
- Filter outlet
- Main scavenge pump (correct)
- Propeller brake
- System pressure relief valve
How is the RGB scavenge system divided?
How is the RGB scavenge system divided?
- By the propeller shaft
- By the planetary gear system
- By a bearing diaphragm (correct)
- By the system pressure relief valve
What are the two pumps used to effectively scavenge the RGB?
What are the two pumps used to effectively scavenge the RGB?
At what pressure does the system pressure relief valve begin to open?
At what pressure does the system pressure relief valve begin to open?
What is the purpose of the check valve in the RGB oil system?
What is the purpose of the check valve in the RGB oil system?
How is the oil returned to the accessory gearbox after being removed by the breather?
How is the oil returned to the accessory gearbox after being removed by the breather?
In what scenario would the filter bypass in the RGB pump and filter assembly open?
In what scenario would the filter bypass in the RGB pump and filter assembly open?
What ensures that oil does not drain into the RGB from the oil tank when the engine is not running?
What ensures that oil does not drain into the RGB from the oil tank when the engine is not running?
How is the RGB (Reduction Gearbox Assembly) pump pressure typically regulated?
How is the RGB (Reduction Gearbox Assembly) pump pressure typically regulated?
What is the function of the nose scavenge pump?
What is the function of the nose scavenge pump?
Where is the main scavenge pump located?
Where is the main scavenge pump located?
What does the pressure relief valve in the scavenge system do?
What does the pressure relief valve in the scavenge system do?
When is the nose scavenge pump particularly active in scavenging oil?
When is the nose scavenge pump particularly active in scavenging oil?
Where does the scavenged oil from the power section and RGB systems pass before combining?
Where does the scavenged oil from the power section and RGB systems pass before combining?
What is the purpose of the external scavenge oil filter in the RGB and power section?
What is the purpose of the external scavenge oil filter in the RGB and power section?
What is the function of the bypass valve in the external scavenge oil filter?
What is the function of the bypass valve in the external scavenge oil filter?
How does the fuel cooled oil cooler contribute to preventing ice crystals from entering the fuel system components?
How does the fuel cooled oil cooler contribute to preventing ice crystals from entering the fuel system components?
What is the range within which the bypass valve in the external scavenge oil filter operates?
What is the range within which the bypass valve in the external scavenge oil filter operates?
Why is an air cooled oil cooler used after the fuel cooled oil cooler in the oil return path?
Why is an air cooled oil cooler used after the fuel cooled oil cooler in the oil return path?
What is the main function of a cyclonic breather?
What is the main function of a cyclonic breather?
How does a cyclonic breather separate oil from air?
How does a cyclonic breather separate oil from air?
What is the role of a temperature transmitter in an oil system?
What is the role of a temperature transmitter in an oil system?
Which component accurately senses oil temperature?
Which component accurately senses oil temperature?
What happens to oil in a cyclonic breather after separation from air?
What happens to oil in a cyclonic breather after separation from air?
What is the purpose of the delivery element in the power section oil pump?
What is the purpose of the delivery element in the power section oil pump?
What is the function of the bypass valve in the oil system?
What is the function of the bypass valve in the oil system?
When does the check valve open in the system?
When does the check valve open in the system?
Which component prevents excessive back-pressure at the power section oil pump outlet?
Which component prevents excessive back-pressure at the power section oil pump outlet?
Where does the oil enter after passing through the filter assembly in the oil flow path?
Where does the oil enter after passing through the filter assembly in the oil flow path?
What is the purpose of a system pressure relief valve in an aircraft engine?
What is the purpose of a system pressure relief valve in an aircraft engine?
How does a direct lubrication oil jet system differ from a mist and vapour lubrication oil jet system?
How does a direct lubrication oil jet system differ from a mist and vapour lubrication oil jet system?
What is the main function of breathers in an engine's oil scavenge system?
What is the main function of breathers in an engine's oil scavenge system?
In what way does an under race lubrication jet system improve cooling?
In what way does an under race lubrication jet system improve cooling?
What role do compressor bleed air play in some engines' lubrication systems?
What role do compressor bleed air play in some engines' lubrication systems?
How are slot acting oil jets utilized in bearing inner races different from conventional spray jet lubrication?
How are slot acting oil jets utilized in bearing inner races different from conventional spray jet lubrication?
Why is a wider area of lubrication preferred in some large engines?
Why is a wider area of lubrication preferred in some large engines?
What could be a consequence of an undesirable build-up of air pressure in an engine's oil scavenge system?
What could be a consequence of an undesirable build-up of air pressure in an engine's oil scavenge system?
What is the primary benefit of using compressor bleed air for some engines' lubrication systems?
What is the primary benefit of using compressor bleed air for some engines' lubrication systems?
What differentiates a direct lubrication oil jet system from an under race lubrication jet system?
What differentiates a direct lubrication oil jet system from an under race lubrication jet system?
