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TM 9-4120-389-14
If the liquid refrigerant observed in the sight glass has an opaque, milky appearance, or frequent bubbles
appear, the volume of refrigerant is low and the system should be charged. Either moisture or low charge
indications should be reported to direct support maintenance.
CAUTION
Do not operate the air conditioner in the COOL mode if the refrigerant color has
reached the yellow band or if numerous bubbles appear in the sight glass. COOL
mode operation may be continued with the refrigerant color in the chartreuse band
or with only an occasional bubble appearing in the window, but the sight glass
should be rechecked after each four hours of operation to ensure that the condition
has not become worse.
2-4
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