SDR ASAA0956120

Service difficulty report · Coupler · Boeing 737890

Difficulty date: July 4, 2009
Submitted: July 7, 2009
Operation: Air carrier
Aircraft: N564AS
Make and model: Boeing 737890
Aircraft serial: 35103
Aircraft time: 10,760 hours, 3,426 cycles
System (JASC): 2310 · HF Communications System
Part: Coupler
Part number: 534011
Part serial: 3570
Condition: Failed
Location: Nr 2 Hf Antenna
Part time: 20,482 hours, 7,096 cycles
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

INTERMITTENT COMM SELECTION ON NR 2 COMM SELECTOR. NR 1 HF AND NR 2 VHF INTERMITTENT ON NR 2 RTP. AFTER CYCLING SWITCHES SEVERAL TIMES OPS CK GOOD FOR REMAINDER OF FLIGHT. ACFT GROUNDED. REPLACED NR 2 RADIO TUNING PANEL, OPS NORMAL REF MM 23-12-41-400-801/860-801C1. HF SYS OPS NORMAL REF MM 23-11-00-730-801. VHF SYS OPS NML REF MM 23-12-00-730-801. VERIFICATION FLIGHT FAILED. REPLACED NR 1 HF ANTENNA COUPLER. OPS CHK NORMAL. VERIFICATION FLIGHT FAILED. REPLACED REU. OPS NORMAL. VERIFICATION FLIGHT SUCCESSFUL.