Which description matches the PW127 engine compressor type?

• A. 2 spool, free turbine compressor, reverse flow, combustion chamber
• B. 1 spool, fixed turbine, forward flow, combustion chamber
• C. 3 spool, free turbine, forward flow, combustion chamber
• D. 2 spool, fixed turbine, forward flow, combustion chamber

Answer: (A)

Two-spool, free-turbine, reverse-flow with a combustion chamber best matches the PW127. Two spools mean there are separate low- and high-pressure compressor shafts, allowing better efficiency and response across operating speeds. A free turbine design means the power turbine that drives the output is not mechanically tied to the compressor turbines, which is ideal for a helicopter engine because it lets the rotor accelerate independently and improves startup and throttle response. The reverse-flow layout shortens the engine by routing the core flow in the opposite direction, a compact arrangement often used in helicopter engines. The combustion chamber is simply where the fuel-air mix ignites to produce hot gases that drive the turbines.

So this combination aligns with the PW127’s architecture. The other descriptions would require a single-spool or three-spool setup, a fixed turbine, or forward-flow, none of which fit the PW127.