RECEIVED

f1P i ( 2 0 1970 This A TM summarizes the results of the BxA study conducted to investigate the ALSEP Flight 1 PSE Thermal Anomaly. The purpose of the study was to 1) correlate the Flight 1 PSE sensor lunar performance results, 2) determine the most probable cause of the out-of-tolerance temperature condition, and 3) recommend possible thermal modifications to the Flight 3 PSE for Apollo 13 and subsequent models. This interim report has been generated in response to MSC directive BG 931/Lll5