SDR ASAA2021073035584

Service difficulty report · Light · Boeing 737890

Difficulty date: July 30, 2021
Submitted: August 3, 2021
Operation: Air carrier
Aircraft: N557AS
Make and model: Boeing 737890
Aircraft serial: 35176
Aircraft time: 56,028 hours, 16,294 cycles
System (JASC): 2310 · HF Communications System
Part: Light
Condition: Faulted
Location: Transfer Switch
Part time: 30,418 hours, 8,718 cycles
Stage of operation: NR
How discovered: O
Nature of condition: P
Precautionary procedure: O

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

What was found

#1 HF/SAT XFER SWITCHLIGHT HF LIGHT IS NOT ILLUMINATED BULBS TEST OK. GROUNDED - YES. CYCLED AIRCRAFT POWER HF1 LIGHT STILL WONT ILLUMINATE. CREW PERFORMED HF1 TRANSMIT AND RECEIVE TEST AND NO DEFECTS NOTED OTHER THEN LIGHT WONT ILLUMINATE. TROUBLESHOT ISSUE TO HF/SAT ANNUNCIATOR PANEL INOP. REMOVED AND REPLACED HF SAT PANEL AS REQUIRED REF B737-800 AMM 23-15-00-400-804 AND PERFORMED OPS CHECK OF HF SYSTEM REF AMM 23-11-00-730-801 NO DEFECTS NOTED. AIRCRAFT OK FOR SERVICE.