TM 10-1670-287-23&P  0002 00  12. Reserve Deployment System. The reserve deployment system consists of items shown below. The  reserve pilot chute has a 7-inch diameter crown and a 19-inch spiral spring, and is covered with a  combination of Type I nylon and large hole nylon mesh fabric. A 2-inch wide by 18-foot bridle line is  attached to the reserve pilot chute and deployment bag. The deployment bag constructed of nylon  cloth, measures 12 by 16-inches. The mouth of the bag has a channel for an elastic safety stow loop  and grommets for locking the bag closed. The suspension lines are stowed in the suspension line  retention pocket. DIFFERENCES BETWEEN MAIN AND RESERVE PARACHUTE ASSEMBLIES The ram air parachute system consists of a main and reserve parachute mounted in tandem on the back  of the parachutist. The differences between the main and reserve assemblies are as follows:  1.  The main and reserve deployment systems are different and are described in items 2. and 12.,  above. 2.  The main parachute may be deployed by a ripcord or by an Automatic Ripcord Release (ARR).  3.  The reserve parachute may be deployed by ripcord, a left main riser actuated reserve static line, or  by the ARR.  4.  The main risers have excess control line keepers, toggle keepers and control line guide rings; the  reserve risers have excess control line keepers and the control line guide rings only.  5.  There is an 8-inch difference in control line length. The main canopy control lines are longer than the  reserve canopy control lines.  6.  The main ripcord has a single locking pin the reserve ripcord has two locking pins.  0002 00-13  Change 1  Reserve Pilot  Chute Reserve Bridle Line Deployment  Assist Pocket  Deployment Assist  Pocket Reserve Elastic Safety  Stow Loops  Reserve  Deployment  Bag