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6 maneuvers with the array extended, the published flight plan scheduled enough time to retract the array between tests to maneuver and the reextend it. In addition, all extensions and retraction were originally scheduled for daylight passes only. As these constraints were lifted during the mission, there was considerable time made available to fit in extra tests. Per a preflight agreement teleprinter, and the crew developed their own plan of execution optimized from a real-time on-board activity level standpoint. This process proved to be extremely efficient and time-saving. DAP configuration. Several of the dynamics tests required a change to the control acceleration characteristics of the Orbiter DAP. During an SMS session, it was discovered that selection of the AUTO DAP mode with these changes in effect caused the vehicle to lose control. Special care was taken thereafter to make these entries immediately post-test. Future crew and procedures writers for payloads or maneuvers which require modification to control acceleration parameters should be alerted to this situation. Unless absolutely necessary for mission success, the DAP should not be configured such that a single procedural error could cause the vehicle to go out of control. CFES The Continuous Flow Electrophoresis System (CFEW) was attended by the PS from the afternoon of flight day 1 through pre-sleep on flight day 6. In spite of a number of fluid control system instabilities and minor internal leaks, approximately 85 percent of the raw sample was processed during this time. All 100 percent could have been processed had a cabin depress/repress not been performed, since the CFES has to be shut down during large pressure transients. Observations concerning CFEW operations are as follows. Preflight involvement of NASA crew. The CFES was assigned to the original flight manifest several months before the PS was approved as a sixth crewmember. Consequently, the CDR and MS3 began training to operate the system in flight. Shortly after the PS had been officially assigned to the mission, payload requirements expanded significantly to include not only routine operation of the instrument but also frequent biological assays of the collected sample which entailed fairly complex wet chemistry procedures. Although not explicitly called for in requirements documents, it was mutually agreed between McDonnell Douglas management and the flight crew that the CDR and MS3 would continue to train as backups to the PS, at least to the extent to providing inflight assistance should the ambitious flight plan and crew availability warrant. This agreement was subsequently documented officially in the Payload Integration plan (PIP) for this mission only. As it turned out, the PS did not require any assistance in flight for a variety of reasons. However, the significant preflight involvement of the NASA crew in procedures development provided a cognizance of payload operations not previously evident through the current PIP process for payloads associated with a PS. As a result, not only was the PS afforded more efficient operations due to the corporate knowledge of NASA crew experience, but also the implications of CFES corporate knowledge of NASA crew experience, but also the implications of CFES operations and their effect on other mission timeline considerations were well evident, at least to the crew. Although future payloads associated with PS's may not follow the same evolution process with NASA crew support, some means of
