Which item is included in the Abort Start Criteria?

Which item is included in the Abort Start Criteria?

• A. Oil pressure only
• B. No rise in TGT; oil pressure; applicable RPMs within 45 sec; TGT exceeds 851 % TOT; starter drops out before 52%
• C. No rise in TGT; oil pressure; applicable RPMs within 60 sec; TGT exceeds 700 % TOT; starter drops out before 60%
• D. TGT exceeds 900 % TOT

Answer: (B)

Abort Start Criteria are the conditions that tell you to stop a helicopter start to protect the engine and gear train. The best choice lists the full set of triggers you watch for during a start: if there’s no rise in TGT, that means combustion hasn’t lit off and the start should be aborted; if oil pressure doesn’t develop, lubrication isn’t being established and continuing could damage bearings and gearboxes; the rotor RPM must come into the acceptable range within the specified 45-second window, otherwise the engine isn’t spooling up correctly; if the TGT climbs beyond the safe limit (851 % TOT in this case), you’re risking thermal damage; and the starter must drop out before 52% TOT, otherwise a fault in the start sequence is indicated. This combination covers ignition, lubrication, spool-up, thermal limits, and starter operation, giving a complete and safe abort framework. Other options omit one or more of these criteria or use incorrect timing/limits, so they don’t fully represent the required abort conditions.

Abort Start Criteria are the conditions that tell you to stop a helicopter start to protect the engine and gear train. The best choice lists the full set of triggers you watch for during a start: if there’s no rise in TGT, that means combustion hasn’t lit off and the start should be aborted; if oil pressure doesn’t develop, lubrication isn’t being established and continuing could damage bearings and gearboxes; the rotor RPM must come into the acceptable range within the specified 45-second window, otherwise the engine isn’t spooling up correctly; if the TGT climbs beyond the safe limit (851 % TOT in this case), you’re risking thermal damage; and the starter must drop out before 52% TOT, otherwise a fault in the start sequence is indicated. This combination covers ignition, lubrication, spool-up, thermal limits, and starter operation, giving a complete and safe abort framework. Other options omit one or more of these criteria or use incorrect timing/limits, so they don’t fully represent the required abort conditions.