The following simulation is designed to take you through the final six hours of the Operations and Maintenance Instruction (OMI) document S0007, the set of steps firing room personnel follow to perform the tasks required to prepare the shuttle for launch. Your job is to successfully traverse all the milestones in order to get to T-0 and launch the shuttle.

INSTRUCTIONS

1. At each milestone in the count, you will be presented with text that explains in general terms what events are to occur during that particular time frame. Below that is a detailed set of steps taken by the launch team as the countdown continues. Beneath these steps you will find a "CONTINUE" button. Click on that button when you have read the text and the steps. If all systems are still "go" at the end of the milestone, you will proceed to the next milestone. If a problem arises during the milestone, you will be presented with the problem and asked to resolve it.

2. Resolving a problem correctly can have one of three possible outcomes:

• The problem is fixed to everyone's satisfaction so the countdown can continue to the next milestone.
• Resolution of the problem causes a delay in the countdown. The delay, in a real launch, could last from a few minutes to several days. For the purpose of our simulation, if you choose an answer that includes a delay, you will be allowed to continue to the next milestone.
• The problem resolution results in a scrub of the countdown, usually due to a component or subsystem failure on the vehicle or in the ground support equipment (GSE) that, if left unattended, might cause damage to the vehicle and injury or death to the crew. In this case, the countdown is halted, the vehicle and GSE are returned to a safe mode, and the whole process is reset to the beginning. It's frustrating when this kind of thing happens, but it is something we train for and work against. We don't fly until we've done everything we can to make it safe for the crew, the vehicle, and the launch team!

3. Resolving a problem incorrectly will send you back to the beginning of the simulation.

4. The map of the firing room consoles at the upper left of the page contains links to information about the various shuttle systems being monitored and controlled during S0007. Use this information to help make your GO/NOGO decisions.

5. To start the simulation, click on the "START" button below.