For sale is reprint of . NAVSHIPS 93053.42A. Maintenance Standards Book for R-390A/URR Radio Receiver. Includes Correction T-1 and T-1A Dated November 30 1964.
Description from the manual: “The test prescribed herein provide a systematic and efficient method for checking and performing routine preventative maintenance on the above equipment. This book contains specific test procedures which, when accomplished on the above equipment when operating properly, will provide a series of reference standards representing proper performance which, when performed as directed, will detect areas of subnormal performance. Comparison of preventative-maintenance results with the reference standards, and proper analysis and correction of any abnormal results, will serve to avert impending equipment failure”