How many ways are there to manually abort an engine start, and what are they?

• A. Two ways: push START again to shut off electric fuel pumps and ignition and initiate a 20 second dry-motoring cycle; or move the engine switch from RUN to OFF to shut off pumps and ignition without dry motoring
• B. Three ways: push START again, move RUN to OFF, and pull the battery switch
• C. Two ways: flip the master switch or pull the emergency generator
• D. One way: press START again

Answer: (A)

When you need to abort a start on the PC-12 NGX, there are two practical ways that reliably stop the process. One way is to press the START switch again during the start attempt. This action immediately cuts off the electric fuel pumps and ignition. At the same time, it initiates a short dry-motoring cycle, about 20 seconds, which cranks the engine without fuel to purge any remaining fuel and help cool or clear the start system. The other way is to move the engine switch from RUN to OFF, which stops the pumps and ignition right away without triggering the dry-motoring purge. Both methods shut off fuel and ignition, but only the first option adds the deliberate dry-motoring purge post-shutdown. Other power-control actions, like manipulating the master switch or emergency generator, aren’t used to abort an engine start because they affect broader electrical or emergency systems rather than the dedicated engine-start sequence.