# SDR AMTA200700038

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: January 27, 2007
- Submitted: January 30, 2007
- Operation: Air carrier
- Aircraft: [N560TZ](https://openairdocs.org/aircraft/N560TZ), registered now
- Make and model: Boeing 757-33N
- Registry model: [Boeing 757-33N](https://openairdocs.org/model/boeing-757-33n) (OpenAirDocs)
- Aircraft serial: 33525
- System (JASC): [2310 · HF Communications System](https://openairdocs.org/jasc/2310)
- Part: Coupler
- Condition: Defective
- Location: Nr 1 Hf Comm
- Stage of operation: CR
- How discovered: O
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/AMTA200700038

## Discrepancy

L HF INOPERATIVE, AT ALL CREW STATIONS.  DOES NOT TUNE PROPERLY WHEN TRANSMIT BUTTON IS PUSHED, RADIO TRIES TO TUNE FOR ABOUT 20 SECONDS EACH TIME BUTTON IS PUSHED.  REPLACED HF NR 1 SYSTEM COUPLER IAW AMM 23-11-01-4 PERFORMED SATISFACTORY INSTALLATION TEST.  (M)

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.