LDEF (Postflight), S1001 : Low-Temperature Heat Pipe Experiment Package (HEPP) for LDEF, Tray H01 The post landing photograph of the Low Tempera ture Heat Pipe Package (HEPP) experiment was taken from the Orbiter's cargo bay access hatch during post landing operations to prepare the Orbiter for the ferry flight from the Dryden Flight Research Center to the Kennedy Space Center. The white paint dots on the center clamp blocks of the experiment trays right flange and upperer flange appear to be discolored. The discoloration diminishes as as the distance from the vent area of the thermal shields increases. The right and upper tray flanges also appear to be discolored. Finger prints are visible on the thermal panels in the vicinity of the panel mounting fasteners. The Low Temperature Heat Pipe Package (HEPP) experiment occupies two 12 inch deep LDEF experiment trays connected with an inter-tray wiring harness. The HEPP Power tray, an end cor ner tray, occupies a location on the space end of the LDEF in tray location H01 and the HEPP Experiment tray, a peripheral tray, is located in the LDEF tray location F12. The power tray (H01) consist of four solar array panels, one nickel-cadmium (NiCd) battery, a Power System Electronics (PSE) unit, protective thermal blankets that line the tray interior and a thirty seven pound baseplate mounted on thermal isolators to provide a thermally stable mounting for the bat tery and the PSE.. Thirteen strips of thin film thermal control materials, part of an experiment by NASA GSFC that consist of sixty-five samples located at three different LDEF tray locations (H01, F09 and F12), were attached to the experiment tray flanges with Kapton tape. The experi ment was assembled and mounted in the experiment tray with non-magnetic stainless steel fasten ers. The experiment hardware appears to be intact with no apparent changes other than stains along outer edges of the solar arrays. Light brown stains are visible along the upper edges of the solar array mounting plates with faint traces of a lighter colored stain around the outer edge of the base plate. The atomic oxygen experiment thin film strips appear to be in place with only minor dam age. The samples in the upper left corner of the tray appear to be degraded. The Kapton tape appears to be loose in several locations, the sample in the trays lower left corner and the center sample on the right tray flange. In other areas the tape appears to be firmly adhered to the tray flanges.
