FAA Powerplant Written Practice Test

Reciprocating engine starters have starting limits that restrict continuous cranking to:

1. 30 seconds

2. 1 minute

3. 2 minutes

4. 5 minutes

The correct answer is: 1 minute

In the context of reciprocating engine starters, the limit for continuous cranking is set to prevent overheating and potential damage to the starter motor and engine components. Continuous cranking for extended periods can lead to excessive heat buildup, which risks burning out the starter motor or causing electrical failures. The best practice for starting an engine typically allows for a maximum cranking duration of 1 minute. This duration is based on engineering considerations for temperature management and to ensure the starter remains in good condition while attempting to start the engine. After this minute of cranking, it is recommended to allow a cooling-off period to ensure that the starter can recover and be ready for any subsequent attempts to start the engine. This guideline helps maintain the longevity and reliability of the starter and overall engine system, thereby ensuring safer operation of the aircraft. Other time limits such as 30 seconds, 2 minutes, or 5 minutes exceed safe operational parameters, and adhering to the 1-minute cranking limit is essential for optimal performance and safety.