What was found
DURING FLIGHT, THE CREW NOTED THAT BOTH NR 1 AND NR 2 HF RADIOS WOULD GO OUT FOR ABOUT 15 SECONDS AFTER THE NR 1 HF TRANSMIT SWITCH WAS DEPRESSED. THE NR 2 HF RADIO OPERATED NORMALLY IF NO ATTEMPT WAS MADE TO TRANSMIT ON THE NR 1 HF RADIO WITHIN THE PREVIOUS 15 SECONDS. PRIOR TO LANDING, THE CREW NOTED THAT THE NR 1 HF RADIO OPERATED NORMALLY. AIRCRAFT LANDED IN SNA WITHOUT FURTHER INCIDENT. MAINTENANCE PERFORMED FIM TASK 23-11-00-810-801 WITH NO DEFECTS NOTED. BOTH HF RADIOS OPERATED NORMALLY. AIRCRAFT WAS RETURNED TO SERVICE.