According to one report, Bill Gerstenmeyer is quoted as saying the Shuttle SRB's "only use two chutes"!! :shock: Since when has this been the case? When I worked on the program each Shuttle booster used three (3) 136 ft. diameter main chutes. Did they change something, and if so when and why? With three chutes we had "single chute out" capability to recover the boosters. The remaining two were adequate to recover the booster, albeit with more damage to the aft skirt. I realize I have been away from the program for 20 years, but it sounds a bit strange to have reduced the number of mains on Shuttle boosters. (Did they go to two 150 ft. dia. mains, or something?) Please, Shuttleguy or someone with current info, reply.