🔍 Key Concepts

• Compare how wet sump and dry sump systems store and return lube oil in gas turbines • Look at where the oil goes after it leaves each bearing sump in the GT-0017 illustration • Note the role of the air‑oil separator and any external return lines or tanks shown

💭 Think About

• From the picture, does the engine casing itself appear to act as the main oil reservoir, or is oil scavenged away to another location? • Follow the arrows from the bearing sumps: do they drain together or separately, and do they drain into a large reservoir under the engine or into a recovery/return system? • How would the presence of an air‑oil separator influence whether oil is stored in the engine or in a separate tank?

✅ Before You Answer

• Identify whether the main oil storage is inside the engine (in the sump) or in a separate tank reached by scavenge lines • Confirm whether multiple sumps are drained together into a common system or left individually vented without a central drain • Verify the function of the air‑oil separator shown and whether it suggests continuous scavenging of oil mist back to a tank