# SDR ASAA201808205763

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: August 13, 2018
- Submitted: August 30, 2018
- Operation: Air carrier
- Aircraft: [N506AS](https://openairdocs.org/aircraft/N506AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35690
- Aircraft time: 38,731 hours, 11,896 cycles
- System (JASC): [2310 · HF Communications System](https://openairdocs.org/jasc/2310)
- Part: Hf Comm
- Condition: Malfunctioned
- Stage of operation: CR
- How discovered: 9
- Nature of condition: O
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA201808205763

## Discrepancy

HF NR 1 AND 2 COMMS VERIFICATION IN FLIGHT UNSUCCESSFUL. DUAL HF RADIO CHECK MADE ON FREQ 10057,  REPORTED POOR FREQ TUNING AND 2 BY 3 RECEPTION AND TRANSMISSION. DUAL   CHECK SUCCESSFUL.  ACFT GROUNDED.  REMOVED HF COUPLER NR 1 AND 2  TO CHECK OF HF ANTENNA FEED CONNECTIONS FOR CONDITION AND SECURITY IAW T/C NG-23EO-19805-1. REINSTALLED HF COUPLERS NR 2 IAW AMM 23-11-61-400-801, AND T/C NG-23EO-19805-1.  PERFORMED HF NR 1, OPS CHECKED GOOD IAW AMM 23-11-00/501. PERFORMED HF NR 2 OPS CHECK GOOD IAW AMM 23-11-00/501. ETOPS GROUND VERIFICATION SUCCESSFUL.

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