What is the role of the transition piece in the combustor and what failure modes are checked during overhaul?

• A. Connects combustor to turbine; check for cracks, thermal fatigue, leaks, and coating degradation; verify cooling and fit.
• B. Connects fuel line to compressor; check density.
• C. Supports outer casing; check paint.
• D. Absorbs vibration; check alignment.

Answer: (D)

The transition piece is the hot-gas path between the combustor and the turbine, forming the interface that directs the high-temperature gases into the turbine while accommodating thermal expansion and maintaining a proper seal and flow path. During overhaul, you inspect for damage that would interrupt that path: cracks from thermal fatigue due to repeated heating and cooling, leaks at joints or along the piece itself, and degradation of protective coatings that can fail or peel under high temperatures. You also verify that any cooling passages remain clear and that the transition piece mates correctly with adjacent components to ensure proper fit and sealing. This focus on gas-path integrity and structural condition is why this description best matches the role and overhaul checks.