Loss of the VHF 1 COMMUNICATION

TASK 23-12-00-810-804-A
Loss of the VHF 1 COMMUNICATION

1. Possible Causes

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
ESPM 2044320
AMM 23-12-00-740-001	BITE Test of the VHF System
ASM 231201
AMM 23-12-11-000-001	Removal of the VHF Antennas
AMM 23-12-11-400-001	Installation of the VHF Antennas
AMM 23-12-33-000-001	Removal of the VHF Transceiver
AMM 23-12-33-400-001	Installation of the VHF Transceiver

3. Fault Confirmation
Subtask 23-12-00-740-056-A

A. Test
(1) Do the BITE test of the VHF system AMM 23-12-00-740-001.

NOTE: Do this test for the VHF 1 only.

4. Fault Isolation
Subtask 23-12-00-810-053-B

A. If the test gives the maintenance message VHF1 ANTENNA (4RC1)/COAX:

(1) If the fault continues:

(2) If the fault continues:

do a check and repair the coaxial from the VHF 1transceiver (1RC1) to the VHF 1 antenna (4RC1) ASM 231201 and ESPM 2044320.

Subtask 23-12-00-740-057-A

B. Do the test given in Para. 3.

[Rev.8 from Aug 2018] 2026.04.04 04:25:36 UTC