Daily Predive Procedures (Cont)

TM 5-4220-225-14 Table 2-3. Daily Predive Procedures (Cont). Step Procedure (2) Remove diaphragm retainer and inspect diaphragm for damage and deterioration. (3) Apply a light film of lubricant to bead of diaphragm and install diaphragm and ambient diaphragm retainer. Ensure diaphragm seats properly. (4) Install ambient exhaust valve cover. g. Breech Ring Check. (1) Set helmet on top viewport retainer and visually inspect breech ring for dents, nicks, and corrosion. Ensure preformed packing groove is clean. (2) Visually inspect breech ring for damaged, loose or missing mounting screws.If loose, tighten as necessary. (3) Inspect O-ring for nicks, cuts, deterioration and proper size. Apply a thin film of lubricant to preformed packing and install it in helmet breech ring groove. h. Air Supply Whip Check. (1) Remove protective cap from air whip; inspect the fitting for corrosion or damage. (2) Ensure gasket is in good clean condition. Replace if required. Apply a light film of lubricant. i. Communication Whip Assembly Check. Remove protective cap from communications whip and inspect for cuts, sharp bends, corroded contacts, and damaged threads. 2-33