FAA Powerplant Written Practice Test

If the oil in the oil cooler core and annular jacket becomes congealed, what unit prevents damage to the cooler?

1. Contaminant filter

2. Surge protection valve

3. Pressure relief valve

4. Temperature control valve

The correct answer is: Surge protection valve

The surge protection valve plays a critical role in preventing damage to the oil cooler when the oil becomes congealed. When oil thickens, it can create excessive pressure within the cooling system because the flow is restricted. The surge protection valve is designed to open and allow excess oil to bypass the cooler, thereby relieving the pressure buildup. This function is vital in protecting the cooler from potential leaks or structural failure that could arise from increased pressure due to congealed oil. The ability of the surge protection valve to regulate pressure effectively helps maintain the integrity of the oil cooler system, ensuring that it operates within safe limits even under conditions where oil flow may be compromised. Ultimately, this helps prevent overheating and additional mechanical issues, preserving the long-term health and efficiency of the engine's cooling system.