What was found
ACFT RETURNED TO FIELD DUE BOTH HF RADIO ISSUES. CAPT NOTED ON D EBRIEF THAT ON CLIMBOUT, THEY BEGAN TO CHECK BOTH HF ON DIFFEREN T FREQUENCIES AND ALL THEY HEARD WAS STATIC. THEY TRIED MULTIPLE TIMES AT LEAST 10X. ON THE RETURN SEGMENT, THEY TRIED HF1 AGAIN AND IT WORKED FINE. THERE WAS CONVERSATION BETWEEN CREWS AND TO MC THAT A POSSIBLE SOLAR FLAIR MAY HAVE CONTRIBUTED TO THE ANOMA LY. BITE BOTH HF TRANSCIEVERS - #1 AND #2 HF BITE TEST PASSED. REF AMM TASK 23-11-21-400-801. AS PRECAUTION PERFORM AC TO AC HF RADIO CK - (6000) FREQ. TO VERIFY HF'S COM CK OK. (UNABLE TO CK AT TERM AC MOVED TO MOC). OPS CHECK GOOD ON HF1 AND HF2, AC TO AC COMMUNICATION WAS CLEAR. COULD NOT RECREATE ISSUE. HF2 TRANCEIVER WAS REPLACED AS A PRECAUTION. REPLACEMENT OF HF1 TRANSCEIVER STILL NEEDED. COUPLER ALSO NIS AT SFO. REF AMM 23-11-21/401, AMM 23-11-00-710-801 AMM 23-11-00-730-801. PERFORMED OPS.CK. OF HF1, TEST PASSED. NO NEED OF REPLACING #1 TRANSCEIVER AT THIS TIME. REF AMM-23-11-21-400-801