Engine Oil System

Question 1

What type of oil system is it

Answer 1

Dry sump oil system

Question 2

Components of the oil system

Answer 2

Externally mounted supply tank
Externally mounted oil cooler
Pressure pump inside gearbox
Oil filter assembly - filter, filter bypass valve, pressure regulating valve
Oil jets and nozzles
Scavenge pumps
Scavenge oil filter (CEFA)

Question 3

Capacity of engine oil tank

Answer 3

6 quarts

Question 4

CEFA bypass indication and condition range

Answer 4

8.8-10.8 PSID

Question 5

Describe the system as engine oil flows through

Answer 5

1. Oil flows from the 6 qt tank mounted on the deck above the TR drive shaft, passing the oil temp bulb and flowing to the pump in the accessory gear box (driven by Ng)
2. Oil flows from the pump to the filter, pressure regulator and pressure sensor
3. Pressure info is sent to the pressure transducer mounted on the right side of the forward firewall in the transmission compartment
4. Oil moves to the jets and nozzles to lubricate the engine including the support bearings for the compressor, Ng and Np turbines
5. As oil drains it is collected by 4 scavenge pumps: 1 gearbox combined with 1 of systems chip detectors, and 3 engine scavenge pumps
6. All scavenge pumps direct the oil to the gearbox past the 2nd chip detector and to the CEFA
7. The CEFA’s inboard portion acts as a scavenge oil filter with bypass indication and capability at 8.8 - 10.8 PSID
8. Oil flows to the oil cooler located forward of the tank and above the impeller assembly mounted on the tail rotor drive shaft that provides cooling air to the oil cooler
9. Oil passes through the cooler element and returns to the oil tank