EMERGENCY BEACON CORPORATION EBC-406HM Instruction And Maintenance Manual - Page 5

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SECTION 4

ELT INSTALLATION

The EBC-406HM can be installed with the BB-12M or BB-15M mounts.

The choice is determined by the available clearance at the mounting

location.

1. The ELT can be installed in any convenient location within the

cockpit/cabin of the aircraft, preferably within reach of the pilot/copilot;

Transmitters controls must be accessible.

2. For best performance install so that the antenna is visible through

a window when viewed from the outside of the aircraft.

3. The antenna should be at least one inch away from metal window

post.

4. The mounting bracket/tray supplied with the ELT must be securely

attached to the aircraft. One way to judge the security of the installation

is to apply a force to the mounting bracket/tray of about 100 lbs, and

see that it does not move more than ¼ of 1 inch. Greater movement

would suggest that the beacon mounting is not firm enough, and

establishes a possible false alarm situation in conditions of severe

vibration or turbulence. In many cases, various military organizations

have come up with suggested mounting areas that have been

thoroughly researched and found to be preferred locations for specific

aircraft.

5. Use the BB-12M bracket or BB-15M tray as a template to mark out

the holes needed for installation, or refer to Figures 2 and 3 for

dimensions. After selecting a suitable location, drill and mount the

EBC-406HM mounting bracket or tray.

6. When installing the BB-12M, use 3 mounting screws. Use hole

pattern A or B. Refer to page 7. BB-12M hole patterns match legacy

EBC-302HM brackets. Leave a minimum of 3" of clearance on the

latch side of the bracket, as measured from the side of the bracket and

any obstruction, to allow for latch operation. The BB-15M requires 4

mounting screws.

7. Do not install to thin unsupported skin or fabric.

SECTION 5 FINAL INSTALLATION

Perform a self-test, and a full functional check, during initial install,

after battery replacement, or according to maintenance schedules.

Refer to Sections 6 and 7 for details.

Securing the ELT in the BB-12M

Gently install the ELT into its mount until it is fully seated. Do not use

excessive force. It may be necessary to adjust ELT position (front to

back, and left to right) to properly mate the connectors. Close the latch

by lifting the latch spring up, and hooking it on to the top edge of the

ELT. Depress lever until it locks into place. Verify that ELT is off, and

the toggle switch is in the center, "ARM" position.

Securing the ELT in the BB-15M

The BB-15M connector floats for easier installation and removal of the

ELT. When installing the ELT, slide the connector forward, and insert

the ELT into its mount until it is fully seated. Slide the ELT back and

close the latch by bringing the two ends of the latch strap close to

each other. Secure latch spring onto the catch, and depress the

July 2022, Rev 8

EMERGENCY BEACON CORPORATION

lever until it locks into place. Verify that the ELT is off, and that the

toggle switch is in the center, "ARM" position.

SECTION 6 TESTING THE ELT

This section describes how to test the ELT to verify that it is radiating

usable signals on 121.5 MHz, and 406.028 MHZ, and that the two G-

switches are operational. LED and buzzer operation will be verified,

and the loop-back will be checked.

Perform all or some of these tests during initial install, every time the

ELT is reinstalled in its mount, after battery replacement, or according

to maintenance schedules.

To facilitate testing, EBC recommends the following items:

1. A 50-Ohm load attached to the ELT BNC connector to test power

output. If not available, allow at least 1 minute between self-tests.

2. A Male 15-pin D-connector with jumper from pins 1 to 4, for G-

switches testing.

3. A COM radio tuned to 121.500 MHz or 121.700 MHz.

SELF-TEST:

IN-BRACKET TEST

The self-test performed with the ELT in its mount, verifies proper ELT

mating with the mounting bracket connector.

OUT-OF-BRACKET TEST

G-switch tests can only be performed with the ELT out of its mount.

See "G-Switch Test" on page 4.

Always perform a self-test when the ELT is reinstalled in its mount, the

battery is replaced, or according to maintenance schedules. Section 7

describes error code meanings.

IMPORTANT:

TEST CONDITIONS DETERMINE ERROR CODES. USE THE

ERROR CODE CHART ON PAGE 4 FOR TEST RESULTS.

POWER OUTPUT CHECKS:

NOTE: With tape antenna attached, a 3-code (low 121.5 MHz

power) will be commonly observed, but not necessarily. Also,

depending on the proximity of the antenna to other objects, a 4-

code may or may not be displayed. On occasion, no codes may

be displayed; this is ok, and is due to normal manufacturing

variances.

Rotating the tape antenna can have the effect of moving it away

from objects, and can result in clearing the 4-code, but this is not

always the case.

Verify 121.5 MHz power by using one of the three methods

described below.

Method 1 – With Tape Antenna Attached

1. Tune COM radio to 121.700 MHz. If a COM is not available, an

inexpensive AM radio can be placed near the ELT antenna.

2. Perform self-test with antenna attached. ELT audio sweeps

SHOULD BE HEARD on the COM or AM radio (This is not a measured

check. It indicates that the ELT is radiating a sufficient signal to aid

search and rescue). The ELT will perform a self-test, return the results

of the test via the LED/buzzer, and then deactivate. See error code

chart