The rcp can not send the arinc 429 data to the hf transceiver
The HF transceiver does not receive the ARINC 429 data from the RCP
The wiring from the RCP to the HF transceiver is bad.
Hf Transceiver Built-In Test hf Transceiver Built-In Test
The HF transceiver has a built-in test. To start the test, push the
TEST switch on the front of the transceiver. The LRU STATUS,
KEY INTERLOCK, AND CONTROL FAIL lights show red for two
seconds. Then, the LRU STATUS light shows green for two
seconds and the other two lights show red. At the end of two
seconds, all lights turn off until the test is complete. Then, the
transceiver shows the result of the test for 30 seconds.
The LRU STATUS light comes on red if there is a failure in the HF transceiver. The KEY INTERLOCK light comes on red if there is an HF coupler fault. The CONTROL FAIL light comes on red if there is a control input failure from the control panel.
Communications B-737-600/-700/-800/-900:
HF COMMUNICATION SYSTEM
VHF COMMUNICATION SYSTEM
EMERGENCY LOCATOR TRANSMITTER SYSTEM
AIRCRAFT COMMUNICATIONS ADDRESSING AND REPORTING SYSTEM (ACARS)
SELECTIVE CALLING SYSTEM
PASSENGER ADDRESS SYSTEM
PASSENGER ENTERTAINMENT SYSTEM – VIDEO
PASSENGER ENTERTAINMENT SYSTEM-AUDIO
SERVICE INTERPHONE SYSTEM
FLIGHT CREW CALL SYSTEM / CABIN INTERPHONE
GROUND CREW CALL SYSTEM
FLIGHT INTERPHONE SYSTEM
STATIC DISCHARGERS
VOICE RECORDER SYSTEM