GTS Mod 3 Difficult

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What does increasing RGB oil pressure indicate?

Proper lubrication of moving parts

System pressure relief valve malfunction

Debris causing restrictions in the oil galleries (correct)

Issues with the accessory drive train

Where does the system pressure relief valve release pressure back into if it exceeds approximately 250 PSI?

Propeller brake

Planetary gear system

Main drive gear

Rear case of the RGB (correct)

Which part of the RGB assembly requires oil lubrication directly?

Accessory drive train

Planetary gear system (correct)

Propeller brake

Pinion input gear

How is the accessory drive train lubricated in the RGB assembly?

By oil mist from the main drive gear Signup and view all the answers

What divides the RGB into two main parts in the scavenge system?

Bearing diaphragm Signup and view all the answers

Which pumps are used for effective scavenging of the RGB?

Main scavenge pump, nose scavenge pump Signup and view all the answers

What is the purpose of the system pressure relief valve in the RGB oil system?

To prevent excessive pressure buildup in the RGB oil system. Signup and view all the answers

How does the oil return to the accessory gearbox after being removed by the breather?

Through the uppermost vertical strut of the air inlet housing. Signup and view all the answers

What type of pump drives the RGB oil pump and filter assembly?

Gear pump Signup and view all the answers

What component prevents the oil tank from draining into the RGB when the engine is not operating?

Check valve at 9 PSI Signup and view all the answers

In which part of the RGB is the filter located?

Outlet side of the pump Signup and view all the answers

What is an important feature of the RGB pump pressure adjustment?

Compensating for normal wear by adjusting output pressure Signup and view all the answers

What is the purpose of the nose scavenge pump in the Allison T56 engine?

Scavenging oil from propeller shaft bearings Signup and view all the answers

Which pump is mounted inside the reduction gear assembly in the Allison T56 engine?

Main scavenge pump Signup and view all the answers

What drives the nose scavenge pump in the Allison T56 engine?

Splines on the propeller shaft Signup and view all the answers

At what pressure does the pressure relief valve in the scavenge system of the Allison T56 engine relieve pressure?

250 PSI Signup and view all the answers

Where does the oil dumped by the pressure relief valve go in the Allison T56 engine?

Front case Signup and view all the answers

What component does the main scavenge pump in the Allison T56 engine primarily scavenge oil from?

Bearings and gears in the reduction gear assembly Signup and view all the answers