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[i]We jettisoned the AMU backpack before going to sleep to get rid of its package of explosive fuel, which was nothing less than a cache of live ammunition.[/i]
[i]The AMU was left in the adapter because of the unknowns associated with jettisoning it in a postdonning configuration. Tests had shown there was no potentially hazardous condition in the backpack, with the possible exception of the propulsion system. An unsafe condition would occur only if the pressure of the H2O2 [hydrogen peroxide] propellant increased significantly. Adequate instrumentation was available to detect an impending unsafe condition in the H2O2 (telemetry, cockpit gages, and cockpit warning light). Previous flight data had shown that the H2O2 was extremely stable. The H2O2 pressure rise from EVA through retrofire was no greater than expected, and it was not necessary to jettison the backpack.[/i]
[i]The AMU remained in the adapter with the systems activated for flight until retrofire.[/i]
[i]Although the AMU was transmitting telemetry data following power-up during the predonning activity, failure of the Gemini data recorder precluded quantitative analysis of AMU performance.[/i]
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