Space Shuttle NASA Mission Reports: 1986 and 1988 Missions, STS 61-C, STS-26, STS-27 by Spaceflight News World & Aeronautics and Space Administration (NASA) National

Author:Spaceflight News, World & Aeronautics and Space Administration (NASA), National
Language: eng
Format: mobi
Publisher: Progressive Management
Published: 2012-01-03T05:00:00+00:00

All APU fuel and water cooling heater systems operated nominally and maintained temperatures within the respective system's operational limits during the on-orbit period. At lift-off, APU system 3 exhaust gas temperature sensor failed, however, this did not impact the mission.

All three APU isolation valve set temperatures were maintained within a nominal range, however, the APU system 3 isolation valve set had the lowest average temperature. Each set of valves (3 sets of 2 valves each with one set for each APU) was instrumented with four new sensors. All three sets had similar heater duty cycles, approximately 16 percent, and were exposed to similar environments, 20 degrees F +5 degrees F. The valve sets registered average temperatures of 72 degrees F, 83 degrees F and 58 degrees F for APU system 1, 2, and 3, respectively.

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