EMERGENCY BEACON CORPORATION EBC-406HM Manuale di istruzioni e manutenzione - Pagina 4

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SECTION 1

GENERAL DESCRIPTION

The EBC-406HM is an Emergency Locator Transmitter (ELT)

designed for military helicopter installation. It meets the requirements

of TSO-C126 in the Automatic Portable (AP) category (see Figures 1

& 2). It is designed for mounting in the cabin of the aircraft, within reach

of the pilot or co-pilot. As with all EBC ELTs, the increased survivability

needs of cabin mounting have been met. The electronics and the

activation system are completely encapsulated, and extra protection

has been provided for the crystal. Our encapsulation method provides

added protection against shock and moisture. The ELT transmits on

406.028 MHz, the civil 121.5 MHz, and the military 243.0 MHz

emergency frequencies.

A unique characteristic of helicopter performance is that in the event

of a loss of power, a helicopter may not necessarily go down nose first

and may not have any forward motion. This may render a single axis

G-switch ineffective. The EBC-406HM has two special G-switches that

can sense deceleration forces from all directions, making it uniquely

suited for helicopter use. These 360° spherical switches are identical

to those used and proven in our original helicopter ELTs (our EBC-

302HM, EBC-302VRHMJ-121.5, EBC-302VRHMJ-243.0, EBC-

302VHMJ, and EBC-502HM models). They will not trigger during a

hard landing.

The EBC-406HM system has an LED (on the ELT) and buzzer (on the

mounting bracket/tray) to indicate ELT activation, and self-test results.

The LED and toggle switch are recessed to provide added protection

against damage and inadvertent activation.

The bottom of the ELT houses a recessed D-Sub connector that mates

with the mounting bracket/tray connector. The mounting bracket/tray

connector is wired to a buzzer, and also wired with a G-switch loop;

this loop-back enables the G-switch when properly mated to the ELT

connector.

To prevent inadvertent activation, the ELT G-switches are disabled

when the ELT is removed from its mount.

No external power connections are required. All indicators and controls

are powered from the ELT's battery pack. Installation near the pilot

eliminates the need for a wire harness and Remote Control Monitor.

SECTION 2 REGISTERING YOUR ELT

It is required that every 406 ELT be registered by the aircraft owner

after installation, re-registered every two years, and re-registered if

there are any changes to information provided to JSETS in a previous

registration, such as telephone numbers, aircraft registration number,

change of owner, ...etc.

Every 406 ELT is programmed at the factory with a unique

identification code used by the Rescue Coordination Center to

determine if an emergency has occurred. This identifier is called the

15-Hex ID. It is located on the front label of the ELT.

This unique identifier is stored in a database maintained by

DOD/JSETS. It can be accessed to contact the owner in the event of

ELT activation. Registration is free, and can even be done via the

Internet. See the Airworthiness Release for further instructions on

registration.

Make sure that the 15-Hex ID on the front label of the ELT is properly

entered on the form. Also, enter all required information. Once you

receive your registration confirmation, review it carefully. Failure to

of any changes to the status of your 406 MHz beacon could result in

penalties or unnecessary delays in search and rescue operations.

SECTION 3 TOGGLE SWITCH FUNCTIONS

The EBC-406HM must be installed in the cabin of the aircraft, within

reach of the pilot or co-pilot, for easy access in an emergency.

ON position:

This position (closest to the antenna connector) manually activates the

ELT. The ELT will begin radiating a distress signal on 121.500 MHz,

243.000 MHz, and within 50 seconds, will radiate an emergency coded

signal on 406.028 MHz.

ARM position:

This position (center position) is the normal operating position for the

ELT. When properly installed in its mount, the ELT is armed and ready

to activate if an accident is sensed. When removed from its mount, the

G-switch is disabled, and any mishandling will not result in activation;

the ELT can still be activated by setting the toggle switch to the "ON"

position.

TEST-RESET position:

This position (closest to the LED) is used to self-test, and to deactivate

the ELT.

To deactivate the ELT, momentarily hold the toggle switch in this

position (closest to LED), for about one second and quickly release.

The ELT will perform a self-test, and then deactivate. Refer to

Sections 6 and 7 for self-test instructions and results.

To self-test the ELT, momentarily move the handle from the center

position to the "TEST-RESET" position; hold for about one second and

quickly release. The ELT will perform a self-test and then deactivate.

Refer to Sections 6 and 7 for self-test instructions and results.

It is recommended that the homer signal be monitored on a radio

tuned to 121.500 MHz.

DISABLING THE AUTOMATIC ACTIVATION FEATURE

The ELT G-switch is disabled when the ELT is removed from its mount,

and enabled ONLY when the ELT is installed and properly mated to

its mounting bracket/tray connector. The mounting bracket/tray

connector has a loop-back installed at the factory. The loop-back is

checked by the self-test.

A "2 code" indicates a disabled G-switch.