What was found
WHEN SELECTED HF #1 SHOWS FAIL ON RADIO TUNING PANELS. GROUNDED - YES. VERIFIED, CYCLED HF#1 C/B, FREQS APPEARS WITH NO AUDIO SIDE TONE THEN CHANGE BACK TO FAIL. REMOVED & REPLACED HF-1 TRANSCEIVER REF B737-900 AMM 23-11-21.
- Difficulty date
- February 7, 2023
- Submitted
- February 9, 2023
- Operation
- Air carrier
- Aircraft
- N478AS
- Make and model
- Boeing 737990ER
- Aircraft serial
- 44105
- Aircraft time
- 28,063 hours, 8,878 cycles
- System (JASC)
- 2310 · HF Communications System
- Part
- Transceiver
- Part number
- 8220990004
- Part serial
- 40F8PY
- Condition
- Failed
- Location
- E/E Bay, E8-1
- Part time
- 33,019 hours, 9,758 cycles
- Stage of operation
- NR
- How discovered
- V
- Nature of condition
- J
- Precautionary procedure
- K
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.