Drew up abort plans and was responsible for determination of retrofire times. Glenn gave a ten-second countdown to retrofire. The spacecraft attitude was steady during retrofire. He allowed the spacecraft to continue to its normal second orbit retrofire position near California. It is the first spacecraft to use a ceramic (silicon nitride) retrofire thruster. A large object was jettisoned when the craft was preparing for retrofire. The spacecraft would land 21 minutes and 49 seconds after retrofire. The spacecraft repeated this drift and correction process nine times before retrofire. The retrofire, re-entry, and landing took place without incident on 23 September. After undocking, the spacecraft performs a retrofire and burns up in the atmosphere.