What was found
HF 1 UNABL 2 TRNSMT 15 MIN AFTER TAKOFF HF2 UNABL TO TRNSMT 28MI N AFTER TAKOFF 3) REPLACE BOTH COUPLERS AS PRECAUTIONARY. DUE TO HISTORY OF HF ISSUES, PLS PERFORM 1) HF TEST PER AMM TASK 23-11-00-735-009-001, 2) CHECK HF ANTENNA BONDING PER TASK 23-11-04-766-001 AND INSPECT COUPLER CONNECTOR AND ANTENNA FEEDLINE FOR SIGNS OF CORROSION ENSURE CONNECTIONS ARE SECURE. REPLACED BOTH HF COMMUNICATION ANTENNA COUPLERS PER AMM: 29-2311-9-0010,QTY :1 23-11-01/401. REPLACED BOTH HF COMMUNICATION TRANSCEIVERS TRANSCEIVER TEST SATISFACTORY. COMMUNICATION ANTENNA COUPLER INSTALLATION TEST SATISFACTORY.