Fault Isolation; Troubleshooting Guidelines; Table 6. Troubleshooting Guide - COBHAM ELT/NAV INTERFACE Abbreviated Component Maintenance Manual

TASK 25-69-10-810-801

6. Fault Isolation

SUBTASK 25-69-10-810-001
A.

Troubleshooting Guidelines

(1) Table 6 provides ELT troubleshooting guidelines for installation and operational issues.
SYMPTOM
ELT and remote switch LED
display 5-flash error
(No navigation data present)
ELT and remote switch LED flash
rapidly within two minutes after
ELT/NAV Interface power up
(24-bit address not accepted)
COBHAM AVIONICS WULFSBERG ELECTRONICS
ABBREVIATED COMPONENT MAINTENANCE MANUAL
453-6500

Table 6. Troubleshooting Guide

PROBABLE CAUSE
Aircraft navigation system off
No power to ELT/NAV Interface
Faulty interface wiring or
connections
ELT not programmed for 24-bit
address location protocol
Faulty interface wiring or
connections
POSSIBLE SOLUTION
Turn on navigation system
Turn on power
Check breaker/fuse
Check for frayed insulation
causing short or ground
Verify integrity of all crimp and
solder connections
Check wiring continuity and
repair as necessary
Program ELT with 24-bit address
location protocol
Check for frayed insulation
causing short or ground
Verify integrity of all crimp and
solder connections
Check wiring continuity and
repair as necessary
25-69-10
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APR 06/10