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TM5-4120-377-14
5-21. LIQUID SIGHT INDICATOR (SIGHT GLASS)
Preliminary procedure: Remove rear panel. (See para 4-32.)
a. Inspection
(1) Check that glass window is clean and not cracked or broken. Clean if dirty. Replace liquid sight
indicator if cracked or broken.
(2) Check for evidence of leakage. Leak test if leak is suspected. Repair or replace as indicated.
Figure 5-20. Liquid Sight Indicator (Sight Glass)
b. Removal
NOTE
It is necessary to remove sight glass bracket to remove rear panel.
(1) Discharge the refrigerant system per paragraph 5-6.
(2) While purging the system with nitrogen, debraze the tubing. (See para 5-7 and 5-8.)
(3) Remove liquid sight indicator.
5-42
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