General Authority of Civil Aviation (GACA) Aeronautical Information Publication (AIP) Practice Exam

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What is the procedure for engine run-up during prolonged ground operations in icing conditions?

Run-up every 15 minutes
Run-up while at full power
Run-up as needed when OAT is 3º C or below
Run-up only before takeoff

The correct answer is: Run-up as needed when OAT is 3º C or below

The procedure for engine run-up during prolonged ground operations in icing conditions involves conducting a run-up as needed when the outside air temperature (OAT) is 3º C or below. This is essential in ensuring that ice particles do not accumulate in critical engine components, such as the fuel system or the air intake area, which can lead to engine performance issues or even failure. When temperatures drop, there is a higher risk of ice formation, and periodic checks can help prevent related complications. This choice emphasizes the need for vigilance and proactive measures during colder conditions, thereby contributing to safer operations. By relating the engine run-up specifically to the temperature threshold, it establishes a practical approach to mitigate risks associated with engine performance in icing scenarios.