What was found
HF RADIO - TRANSMISSION PROBLEM. LT HF INTERMITTENT TRANSMIT ON VARIOUS SELECTED FREQENCIES CANNOT HEAR SIDE TONE. REPLACED LT HF COUPLER AND VOICE CALL FROM LT HF TO SF.
- Difficulty date
- August 11, 2013
- Submitted
- August 14, 2013
- Operation
- Air carrier
- Aircraft
- N221UA
- Make and model
- Boeing 777222
- Aircraft serial
- 30552
- Aircraft time
- 51,388 hours, 6,366 cycles
- Engine
- Pwa PW40903
- System (JASC)
- 2310 · HF Communications System
- Part
- Coupler
- Part number
- 490S1
- Part serial
- 27873
- Condition
- Faulty
- Location
- Hf Radio
- Stage of operation
- NR
- How discovered
- 9
- Nature of condition
- O
- Precautionary procedure
- O
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.