Apollo 15 Lunar Surface Magnetometer failure

Abstract

The LSM experiment data output became invalid at 15.07.33 hours on 10 December 1973. The data indicated "all ones". There have been spasmodic attempts by the experiment to output data since the original failure occurred, but none of the data has been valid. Evaluation of the data around the time of failure indicates that either the power regulator or the data handling circuitry has failed.