ETR cesium maintenance and repair

The procedures are described by which the Air Force Eastern Test Range´s (ETR) cesium beam frequency standards (cesiums) are maintained and repaired. The ETR uses over 75 cesiums, distributed among various instrumentation sites throughout the range, as primary frequency standards in precise time and time interval (PTTI) systems. These cesiums perform critical-mission support functions and must be maintained at a high state of readiness. The Air Force regulations authorizing local (ETR) repairs are briefly examined. Maintenance routines and repair procedures, from fault determination to certification of repair, are presented. Repair facilities and test equipment are described. And finally, the authors comment on what is needed from industry and government to facilitate frequency standard procurement and repair