🔍 Key Concepts

• Trace the sump vent air line from the A–D sumps to see exactly what flows into the air/oil separator. • Note where the separator’s drain line returns in the LOSCA (lube oil storage and conditioning assembly) and what that says about the oil flow. • Compare which components in the diagram actually affect pressure in the sumps and which ones handle venting and recovery of oil mist.

💭 Think About

• Ask yourself: Does any pressurized oil line run through the air/oil separator, or is it only connected to vent air coming off the sumps? • If the separator is handling vent air plus an oil drain back to the tank, which single function from the choices best matches that job? • Which other components in the system (e.g., pressurization ejectors, tank, cooler) would be more logically responsible for controlling sump pressure or oil foaming, instead of this separator?

✅ Before You Answer

• Verify which color/line type in the legend corresponds to sump vent air and follow it into and out of the separator. • Confirm that the separator’s outlet goes to a vent to atmosphere path while its drain returns oil to the system, indicating recovery rather than pressure control. • Before choosing D) All of the above, be sure you can clearly explain how this single component would perform each listed function, using only what the diagram shows.