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1. THE SPACE SHUTTLE FLIGHT CONTROL SYSTEM CALLED PASS SOFTWARE
2. THE SPACE SHUTTLE FLIGHT CONTROL SYSTEM CALLED PASS PLUS

Let X denote the number of computers that vote for a left roll when a right roll is appropriate.

The probability that a computer will ask for a roll to the left when a roll to the right is appropriate is 0.0001. At each critical step, the computers "vote" to determine the appropriate step. Liftoff occurs when the thrust to weight ratio reaches 1.0 (0.28 seconds after SRB igni tion).

THE SPACE SHUTTLE FLIGHT CONTROL SYSTEM CALLED PASS PLUS

When all three engines have achieved a 90 percent of Rated Power Level (RPL) plus 2.75 seconds, the SRBs are ignited.

THE SPACE SHUTTLE FLIGHT CONTROL SYSTEM CALLED PASS SOFTWARE

Transcribed image text: The space shuttle flight control system called PASS (Primary Avionics Software Set) uses four independent computers working in parallel. The launch sequence begins with the start of the Space Shuttle Main Engines (SSMEs). Flight controllers gave STS-133 mission commander Steven Lindsey the word that he was go to perform the deorbit burn that will begin the shuttles 39th and. A single SRB has already been flown as a stand-alone rocket, with a dummy upper stage with a mass representing a real upper stage.