Loss of the SELCAL Code

TASK 23-51-00-810-828-A
Loss of the SELCAL Code

1. Possible Causes

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 23-51-00-710-002	Operational Test of the SELCAL System
AMM 23-51-00-820-801	Adjustment of the SELCAL Code
ASM 235106
AMM 23-51-13-000-001	Removal of the SELCAL Code Panel
AMM 23-51-13-400-001	Installation of the SELCAL Code Panel
AMM 23-51-34-000-001	Removal of the Audio Management Unit (AMU) (1RN)
AMM 23-51-34-400-001	Installation of the Audio Management Unit (AMU) (1RN)

3. Fault Confirmation
Subtask 23-51-00-710-060-A

A. Test
(1) Do the operational test of the SELCAL system AMM 23-51-00-710-002.

NOTE: Do this test for each HF (if installed) and VHF system.

4. Fault Isolation
Subtask 23-51-00-810-077-A

A. If the ground station cannot make a SELCAL call during the operational test of each HF (if installed) and VHF system:

Make sure that the code of the SELCAL CODE PNL [3RN] is the same as the code transmitted to the ground station AMM 23-51-00-820-801.

(1) If the fault continues:

(a) If the fault continues:

1 If the fault continues:

Do a check and repair the wiring between the SELCAL CODE PNL [3RN] and the AMU [1RN] ASM 235106.

Subtask 23-51-00-710-061-A

B. Do the test given in Para. 3.

[Rev.8 from Aug 2018] 2026.04.04 04:38:57 UTC