Which of the following is the most likely...

🔍 Key Concepts

• Gas turbine automatic shutdown / trip logic during start sequence • Typical start-up protection conditions: light-off, minimum rpm, exhaust gas temperature (EGT) rise within a set time • Difference between a condition that causes an immediate trip during start vs. a condition that causes a maintenance alarm or pre-start restriction

💭 Think About

• During start-up, what parameter does the control system watch most closely to decide whether the engine is actually starting and accelerating safely? • Which of these conditions would most quickly indicate that combustion or acceleration has NOT developed properly during the allowed start window? • Which options are more likely to produce warnings, alarms, or maintenance actions rather than an automatic trip at the very beginning of the start sequence?

✅ Before You Answer

• Identify which choice directly relates to start sequence timing and acceleration rather than general lubrication health. • Consider which conditions are usually checked and corrected before attempting a start (pre-start checks) instead of being used as a dynamic trip during the start. • Ask yourself: which condition can be monitored by the control system in real time to decide, within seconds, whether to abort the start to protect the turbine?

Which of the following is the most likely cause for the main propulsion gas turbine engine tripping during start up?

High oil filter differential pressure.

Low sump oil level.

Failure to achieve the minimum rpm in a certain period of time.

Inlet air ice detection.

🔍 Key Concepts

💭 Think About

✅ Before You Answer