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Space Shuttle Avionics: Difference between revisions
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The PFD is a complicated instrument in which the meaning of various readings depends on switch settings and mission phase (for instance, the ADI reference can be standard pitch/heading/roll as for an aircraft in the final phase of the flight as well as inertial or LVLH in orbit; the range of the error rate display is also selectable, the accelerometer will show Nz during entry and TAEM rather than linear acceleration during launch,...) - so make sure you understand what it is showing before using its information. | The PFD is a complicated instrument in which the meaning of various readings depends on switch settings and mission phase (for instance, the ADI reference can be standard pitch/heading/roll as for an aircraft in the final phase of the flight as well as inertial or LVLH in orbit; the range of the error rate display is also selectable, the accelerometer will show Nz during entry and TAEM rather than linear acceleration during launch,...) - so make sure you understand what it is showing before using its information. | ||
Compare the following PFD in the gliding part of an RTLS abort with the above PFD during launch to appreciate the differences: | |||
[[File:Shuttle avionics meds pfd rtls.jpg|600px|PFD of the Space Shuttle for RTLS abort]] | |||
Most of the original functionality is implemented in FG. | Most of the original functionality is implemented in FG. | ||
=== ORBIT PFD === | |||
[[File:Shuttle avionics meds pfd orbit.jpg|600px|PFD ORBIT display of the Space Shuttle]] | |||
In orbit, the PFD has a special mode accessible via the edge keys which shows only the ADI ball and suppresses all other gauges and scales (which are not particularly meaningful for orbital operations anyway). | |||
=== OMS/MPS === | === OMS/MPS === | ||