If the unit requires additional refrigerant, what will you observe in the sight glass?

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Study for the Aviation Maintenance Technician, Second Class Exam. Engage with flashcards and multiple choice questions, each question comes with hints and explanations. Get ready for your AMT2 exam!

Multiple Choice

If the unit requires additional refrigerant, what will you observe in the sight glass?

Explanation:
When refrigerant is needed, the sight glass will show bubbles. This happens because the pressure drop through the metering device causes some of the liquid refrigerant to flash into vapor as it passes the sight glass. In a properly charged system, the sight glass generally looks clear with a steady flow of liquid and little to no bubbling. Vapor lock isn’t the typical observation here; it would imply a blockage or obstruction due to vapor buildup, not just undercharge.

When refrigerant is needed, the sight glass will show bubbles. This happens because the pressure drop through the metering device causes some of the liquid refrigerant to flash into vapor as it passes the sight glass. In a properly charged system, the sight glass generally looks clear with a steady flow of liquid and little to no bubbling. Vapor lock isn’t the typical observation here; it would imply a blockage or obstruction due to vapor buildup, not just undercharge.

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