Where is the Redundant Independent Mechanical Starting System (RIMSS) Allison Model 250C-KS4 GTE located?

• A. In the ship service engine room
• B. In the control room
• C. In a separate equipment stack
• D. Inside the Ship Service Gas Turbine Generator acoustic enclosure, mounted on top of the reduction gear

Answer: (D)

The starting system is located with the gas turbine itself, inside the Ship Service Gas Turbine Generator acoustic enclosure, mounted on top of the reduction gear. The redundant independent mechanical starting system needs a direct, compact drive that engages the turbine’s geartrain, so placing it right on top of the reduction gear ensures a short, rigid drive path and proper alignment with the turbine’s shaft. Housing it in the acoustic enclosure protects it from the onboard environment, helps dampen noise, and contains any heat or potential hazards, while keeping the start hardware together with the turbine generator for easier maintenance and reliable operation. Placing it elsewhere would introduce longer drive belts or shafts, more complex routing, greater noise and safety concerns, and less straightforward access for servicing.