Question 28Gas Turbine - 1st Asst/Chief

70% to pass

On a gas turbine powered vessel equipped with a synchro self shifting (SSS) clutch, you are preparing for a power turbine over speed test. What would be an important action to take prior to starting the engine?

ARemove the SSS clutch locking pawls.
BCalculate the engagement speed of the SSS clutch.
CEngage the SSS clutch using air pressure.
DManually lockout the SSS clutch from engaging using the special wrench provided.
AI Explanation

The correct answer is D) Manually lockout the SSS clutch from engaging using the special wrench provided. Before conducting a power turbine overspeed test on a gas turbine powered vessel with a synchro self shifting (SSS) clutch, it is important to manually lockout the SSS clutch from engaging. This prevents the clutch from automatically engaging during the test, which could lead to potential damage or unsafe conditions. The special wrench provided by the manufacturer is used to manually lock out the SSS clutch, ensuring it remains disengaged during the overspeed test. The other options are incorrect because: A) Removing the SSS clutch locking pawls would allow the clutch to engage, B) Calculating the engagement speed does not prevent engagement, and C) Engaging the clutch using air pressure would be the opposite of the required action.

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Official Resources
46 CFR Machinery & Electrical 46 CFR Engineering USCG National Maritime Center
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