The Transfer Gearbox (TGB) transmits power for starting the Gas Turbine Engine (GTE) drive train from which engine?

• A. Model 350-KS4 engine
• B. Model 250-KS4 engine
• C. Model 150-KS4 engine
• D. Model 250-KS2 engine

Answer: (B)

During start, the transfer gearbox acts as the bridge that delivers drive to spin the main gas turbine’s drive train using a dedicated starting source. In this setup, the starting source is the Model 250-KS4 engine. Its power is routed through the transfer gearbox to the GTE drive train, providing the initial torque to bring the engine up to speed. Once the turbine is running, the starting source is disengaged and the GTE drives itself via its own power. The other engine variants listed are not used as the starting source in this configuration because they don’t provide the required torque or compatibility for this setup.