What type of air seal is used in the sump and turbine areas of a GTE?

Correct Answer: Option A — Labyrinth-Honeycomb

Labyrinth-honeycomb seals are standard in high-temperature, high-speed areas like sumps and turbine sections. The labyrinth design creates a series of pressure drops, while the honeycomb structure provides a close-clearance, rub-tolerant surface that minimizes gas leakage and oil migration while maintaining structural integrity under extreme thermal expansion.