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[i]As in the previous Skylab launch, SL-4 launch operations differ from earlier ones in that the Countdown Demonstration Test (CDDT) and the final countdown have been incorporated into a single launch countdown.
The early portion of the countdown will include launch vehicle cryogenic fueling and final countdown activities without astronaut participation.
Following the simulated T-0, the count will go into an operational hold until T-42 hours, 30 minutes, prior to launch. The final recycled count will then proceed to launch. There will be no "dry" test with crew participation in the early portion of the count as was done on earlier missions.[/i]
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