SDR ASAA1057262

Service difficulty report · Unknown · Boeing 737890

Difficulty date: January 20, 2010
Submitted: January 22, 2010
Operation: Air carrier
Aircraft: N585AS
Make and model: Boeing 737890
Aircraft serial: 35683
Aircraft time: 9,095 hours, 2,762 cycles
System (JASC): 2310 · HF Communications System
Part: Unknown
Condition: Malfunctioned
Location: Hf Comm
Stage of operation: NR
How discovered: O
Nature of condition: O
Precautionary procedure: K

As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.

What was found

BOTH HF RADIOS CUTTING OUT DURING TRANSMISSION. TRIED BOTH STATIONS (CAPT AND F/O) AS WELL AS HANDHELD MIC WITH TRANSMISSIONS STILL CUTTING OUT. OTHER RADIOS APPEAR NORMAL. SWITCHED FREQS AND HF APPEARS TO BE OPERATING NORMALLY. RADIO WAS CUTTING ON FREQ 5574 BUT APPEARS TO OPERATE NORMALLY ON 3413 AND 6673. NR 1 AND 2 HF'S OPS AND SYSTEM TEST NORMAL USING FREQ 5.574 (SFO ARINC) COULD NOT DUPLICATE FAULT. NO HISTORY, SYSTEM OK FOR SERVICE REF M/M 23 11 0.