During the observation of PSR J0537-6910 on 21-may-2002 (PD 3062), PCU 4 (out of 5) broke down at 264630900 MET, but did not turn off until about 430 seconds later. Will has looked at the data and determined that PCU 4 only violated the criterion for 2 intervals instead of the required 3 intervals at 264630900 MET. It is not clear to me why the detector turned of at 264,631,330. This tripoff was noted in the Shift Report (20020522_A.SRG): Spacecraft anomalies: PCU 4 experienced a trip off during the 141/20:23 - 20:50 goodtime. It was not recorded in the delog so a best guess as to trip off time was established and plugged into the Std 2 rate calculator. PCU 4 resumed normal operation at 142-06:21. report prepared by Frank Marshall