PPL(A) EN: What is the purpose of engine oil in piston engine?
Domanda 128, Aircraft General Knowledge - PPL(A) English - Private Pilot License (Aircraft)
| Cooling, lubrication of the engine and disposal of fine abrasion |
| Cooling of the engine and lubrication of propeller shaft. |
| For nose reduction and bearing of the propeller shaft |
| Cooling, lubrication and increasing engine performance. |
