5.  Periodic Maintenance Procedures. The three-ring release system is a durable item; however; it  requires periodic maintenance and inspection to ensure proper operation. The 3-ring release will be  carefully inspected and cycled (operated) on a regular basis. The procedures below will be  completed every 120-days. This is especially important if the parachute system has not been used  for 120-days or more (such as during the winter). Immediate inspection is required if the system has  been subjected to abuse such as drug across the ground, a water landing, or exposure to a lot of dust  or sand. Perform inspection as follows:  4. Look at the rear of the riser and with the weight (min 20-lbs) of the parachute rig (minus main  parachute) suspended by the riser to be inspected, grasp the release cable housing by the swaged  terminal end fitting with the small grommet in it and slide the end fitting to one edge (either edge) of  the riser. You must NOT be able to move the fitting (do not use excessive force to move the fitting)  completely off the edge of the riser (as depicted in the right illustration below), thus ensuring the  fabric-locking loop is not too long. The length of the fabric locking loop should range as shown below.   TM 10-1670-287-23&P  0011 00  Cutaway  Cable Swaged  Terminal  End Fitting  Off The  Riser  Swaged  Terminal  End Fitting  Cutaway  Cable  Locking  Loop  Locking  Loop Too  Long  Cutaway  Cable  Housing  Cutaway  Cable  Housing WEIGHT OF  PACKED/HARNESS  AND (PACKED)  RESERVE ASSEMBLY  WEIGHT OF  PACKED/HARNESS  AND (PACKED)  RESERVE ASSEMBLY  CORRECT INCORRECT Change 2  0011 00-4 