Ameri-King AK-451-ELT - Manual (Page 55)

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2.2.5 Audible Monitor Location and Installation:
A warning buzzer is required for TSO-C126 approval. The buzzer (P/N 451018) is
powered by the ELT system and, therefore, independent of the aircraft power system.
When the ELT is activated, the buzzer 'beeps' periodically. The time between pulses
lengthen after a predetermined transmitter 'on' time. While the buzzer may be located
anywhere on the aircraft, it is recommended that the buzzer be placed in the cockpit,
near to the Remote Switch Unit. This buzzer operates in tandem with the ELT panel
indicator and would serve as a redundant indicator.
Note: RTCA/DO-204 indicates installation in the cockpit.
The buzzer can be mounted on the instrument panel, using the plastic bezel nut.
Suggested mounting is with the buzzer orifice with an open hole on the instrument
panel, adjacent to the Remote Switch Unit. The 2 mounting ears at its base may be
used as an extra optional mounting secure on the instrument panel.
Another option is tie wrapped the Buzzer, onto the Aircraft Wiring Harness, or
attached by tiewrap onto or behind the Instrument Panel, or fasten directly onto the
Remote Switch Unit (See Figure 11.1).
Connect the Buzzer wiring to the Remote Switch Unite via T-Adapter connector. The
rear of the buzzer can be sealed with RTV; however, the front must be left open.
Note: If the Buzzer for AK-451 is located inside the ELT Main Unit, it is powered by
the ELT Main batteries. The ELT Main Batteries will continue to supply power to the
Buzzer for 78 hours at -20 deg C, at end of 5 years battery life.
Connect Harness:
With the harness installed (See Fig. 14) into the Remote Switch Unit. Install the ELT
in its mounting tray, securing with the Clamp holder. Connect the buzzer wires.
Note: Splicing may be necessary on the buzzer wire, If more than 4’ long. Connector
is to be sealed with RTV after system has been tested.
Once all tests have satisfactorily been completed and all harness connections have
been verified to be correct, the connectors at the remote cockpit switch and the ELT
should be sealed to prevent moisture from getting into the wire entry holes.
Seal using an electronics grade ('neutral cure'), non-slumping RTV such as GE
Silicones RTV162, Dow Corning 748RTV or Silastic 1080RTV.
Helicopter Installations:
Refer to aircraft manufacturer's data (Type Approval or STC information) and/or
national regulations regarding installation on helicopters. The ELT may be installed
in a helicopter with the ELT unit mounted with “Direction of Flight” arrow pointing
downward at a 10
O
angle to the horizontal plane rather than parallel to it.