TM 5-3820-256-10 Table 2-27A.  Life-line, Self Retractable Preventive Maintenance Checks and Services - continued Item Interval Item to be Procedures Equipment is No. Inspected Check for and have repaired Not B  D  A  W   M or adjusted as necessary Ready/Available If: 5 X X  X Red Indica- Models SB57 - SB150 and SB Indicator button not si- tor Button 330: Check that indicator but- tuated where it should ton is flush with casing. be; service life dial indi- cator indicates RED Model C60/50: Check that indi- DANGER. cator button is recessed. DBU Series: Check that visual service life dial indicator does not indicate RED DANGER. 6 X    X  X Red Fer- Check that Red Ferrule/Bobbin If visible, cable has rule/Bobbin is NOT visible on cable. been used to arrest a fall.  Remove from ser- vice immediately and notify supervisor. 7 X    X  X D-rings Check D-rings for wom parts, D-Rings worm, dam- damage or corrosion. aged, or corroded. 8 X   X   X Snap Hooks Check that hooks have snap Hook does not have action and that there is no side- proper snap action; ways play.  Check for worn snap hooks worn, dam- parts, damage, and corrosion. aged, or corroded. 9 X   X   X Automatic Check that hooks lock.  Check Hooks do not lock; locking for worn parts, damage, and hooks worn, damaged, hooks corrosion. or corroded. 10 X   X   X Screwgate Check snap action and that Hooks do not snap hooks screw ferrule function properly. properly; hooks worm, Check for wom parts, damage, damaged, or corroded. and corrosion. Change 5  2-42.2