Operation; Operational Overview; Figure 6. Elt Operational Flow Diagram - ACR Electronics COBHAM B406-4 Abbreviated Component Maintenance Manual

TASK 25-62-03-870-803

2. Operation

SUBTASK 25-62-03-870-001
A.

Operational Overview

(1) See "Figure 6. ELT Operational Flow Diagram".
(2) A primary feature of the B406-4 ELT is its simplicity of operation. As long as the ELT is
connected to the remote switch panel harness ELT connector, such that pins 5 and 8 are
jumpered (G-switch loop), it will activate in the event of a crash.
NOTE:
(3) ELT operation is designed to prevent human error and misuse in regards to automatic
activation. The ELT cannot be activated by dropping, rough handling or during shipping.
(4) When the ELT is activated, the presence of the emergency sweep tone and the illuminated
cockpit remote switch panel light indicates an active ELT. The cockpit ELT remote panel light
must immediately illuminate upon ELT activation and stay on steady.
NOTE:
(5) The ELT is considered to be either "ACTIVE" or "INACTIVE". When "INACTIVE", the ELT is in a
state of rest and performs no functions. Taking the ELT from the "INACTIVE" state to the
COBHAM AVIONICS WULFSBERG ELECTRONICS
ABBREVIATED COMPONENT MAINTENANCE MANUAL
B406-4 (453-5004)
Neither the cockpit remote panel switch or the ELT local switch can be positioned in
such a manner as to prevent automatic activation when the ELT is connected
properly.
ELT
"INACTIVE"
ELT
SWITCH
"ON"
NO
REMOTE
SWITCH
"ON"
NO
G-SWITCH
"ON"
NO

Figure 6. ELT Operational Flow Diagram

The local LED on the ELT flashes every 3-4 seconds when the ELT is activated.
ELT "ACTIVE"
BUZZER "ON"
LED "ON"
ELT OR
NO REMOTE SW YES
"RESET"
YES
YES
YES
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APR 06/10