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→OMS DAP schemes
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: This is a stick-controls-rates scheme which utilizes thrust vectoring for the OMS engines. It resembles in principle the ascent thrust vectoring, except for the fact that the OMS engines are far less powerful and hence rates and the transition to the set rate are a lot slower. Note that this DAP will only control the Shuttle if the OMS is firing. | : This is a stick-controls-rates scheme which utilizes thrust vectoring for the OMS engines. It resembles in principle the ascent thrust vectoring, except for the fact that the OMS engines are far less powerful and hence rates and the transition to the set rate are a lot slower. Note that this DAP will only control the Shuttle if the OMS is firing. | ||
If TVC for the OMS is not feasible (for instance because the OMS engine gimbal actuators are damaged), the OMS engines can also be fired with an RCS attitude-holding rotational DAP active (for example <b>DAP-A</b>. In this case, attitude control is provided by the RCS thrusters and thrust by the OMS engines. | If TVC for the OMS is not feasible (for instance because the OMS engine gimbal actuators are damaged), the OMS engines can also be fired with an RCS attitude-holding rotational DAP active (for example <b>RCS DAP-A</b>. In this case, attitude control is provided by the RCS thrusters and thrust by the OMS engines. | ||
=== The Reaction Control System === | === The Reaction Control System === | ||