What was found
SAT VOICE LOST ADVISORY SATCOM VOICE COMMUNICATION IS LOST (NO SIGNAL/RECEPTION) DUE TO AIRCRAFT MANEUVERING, LOW ELEVATION ANGLES/BLOCKAGE TO THE SATEL LITE OR WHILE FLYING IN A POLAR ROUTE. WHEN AN AIRPLANE IS IN CR UISE MODE, THEN THE MESSAGE IS DELAYED BY 60SECS, OTHERWISE IN . FOUND MX MESSAGE 23-19407 SATELLITE, UNIT OFF 79-2329-9-0001 1715 ON 79-2329-9-0001 0040 SATELLITE, UNIT OFF 79-2329-9-0001 1715 ON 0000 T/S PER FIM TASK DMC-B787-A-23-10-F5-04A-421A-A FOR MX MESSAGE 23-19407. NO FAUTLS FOUND UNABLE TO DUPLICATE INDICATED FAULT. WIRING CHECKS PER FIM TASK ALSO GOOD. PER TECH SUPPORT UPDATE REMOVED AND REPLACED SATCOM SDU AS PRECAUTINARY PER AMM 23-15-10. ADJ/TEST SATISFACTORY. SYSTEM OK FOR SERVICE.