PTC REFSMMAT

PTC REFSMMAT
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Soon after the platform is torqued to the "Launch Orientation" REFSMMAT, it is swung around to the "PTC Orientation" REFSMMAT.

Image:Ptcref.gif

The platform's X-axis is aligned along the ecliptic plane, perpendicular to the line between the Earth and Moon at the time of TLI. It's Z-axis is aligned perpendicular to the ecliptic plane, directed southward. This alignment is used for all translunar and trans-Earth coast maneuvers and as the reference for easy alignment of the PTC (Passive Thermal Control) maneuver. Note that the axes shown do not represent the orientation of the spacecraft during PTC. (ap15fj)

    This article is based on material extracted, with permission, from the [Apollo Flight Journal] by David Woods and Frank O'Brien. The NASA Apollo Flight Journal files are copyright © 1998 - 2004. W. David Woods and Frank O'Brien.(more...)
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