During starting, which condition would require the pilot to abort the start?

During starting, which condition would require the pilot to abort the start?

• A. NR exceeds limits during start
• B. TGT reaches 851 degrees before idle is attained
• C. Oil pressure is low after idle
• D. TGT never rises

Answer: (B)

Hot starts are protected by a turbine exhaust gas temperature limit during the start sequence. If the turbine gas temperature reaches 851°C before the engine has reached idle, you abort the start to prevent overheating and potential damage to turbine blades and bearings. At this stage the engine isn’t yet producing enough airflow and cooling, so allowing the temperature to climb that high would be unsafe. The other conditions indicate different fault scenarios or timing issues: overspeed during start is serious, but the documented immediate abort trigger in this context is the hot-start limit; a lack of rise in TGT or low oil pressure after idle involve separate checks or later phases of troubleshooting rather than the immediate hot-start protection.

Hot starts are protected by a turbine exhaust gas temperature limit during the start sequence. If the turbine gas temperature reaches 851°C before the engine has reached idle, you abort the start to prevent overheating and potential damage to turbine blades and bearings. At this stage the engine isn’t yet producing enough airflow and cooling, so allowing the temperature to climb that high would be unsafe. The other conditions indicate different fault scenarios or timing issues: overspeed during start is serious, but the documented immediate abort trigger in this context is the hot-start limit; a lack of rise in TGT or low oil pressure after idle involve separate checks or later phases of troubleshooting rather than the immediate hot-start protection.