EMERGENCY BEACON CORPORATION
July 2022, Rev 8
Method 2
–
With 50 Ohm Load Attached
1. Tune COM radio to 121.500 MHz.
2. Remove the tape antenna, and attach a 50-Ohm load.
3. Perform a self-test. Three ELT audio sweeps
SHOULD BE HEARD
on the COM. The ELT will perform a self-test, return the results of the
test via the LED/buzzer, and then deactivate.
A “3 CODE”
USING THIS METHOD IS A FAILURE!
Method 3
–
Without Tape Antenna
1. Tune COM radio to 121.500 MHz.
2. Remove the tape antenna.
3. Perform a self-test without anything attached to the ELT antenna
connector. Three ELT audio sweeps
SHOULD BE HEARD
on the
COM. The ELT will perform a self-test, return the results of the test via
the LED/buzzer, then deactivate.
A “3 CODE”
USING THIS METHOD IS A FAILURE!
ERROR CODE CHART
TEST CONDITION
COMMON ERROR CODES
ELT IN ITS MOUNT, OR
WITH LOOP-BACK JUMPER
ATTACHED:
Tape antenna connected
No codes, 3 code, 4 code
50-Ohm load connected
No error codes
With nothing connected to ELT
antenna connector
4 code
ELT OUT OF ITS MOUNT, OR
WITHOUT LOOP-BACK
JUMPER ATTACHED:
Tape antenna connected
no codes, 2 code, 3 code, 4 code
50-Ohm load connected
2 code
With nothing connected to ELT
antenna connector
2 code, 4 code
AN ERROR CODE OTHER THAN THOSE LISTED IN THIS CHART
IS CONSIDERED A FAILURE.
LED, BUZZER CHECK:
The LED and buzzer should indicate when the ELT is transmitting and
when a self-test is performed.
LOOP-BACK CHECK:
The loop-
back is okay if a “2 code” is not returned, with the ELT
installed in its mount.
G-SWITCH OPERATION:
To verify that the two G-switches are operational, it will be necessary
to fabricate a jumper:
Method 1
Use a D-sub 15-pin male connector, and solder a wire between pin 1
and pin 4. Install mating connector to ELT connector.
Method 2
Remove ELT from mount and place a #24 AWG jumper between pins
1 and 4 of the ELT D-sub connector.
Verify that both G-switches are operational by performing two
activations. Tune VHF COM radio to 121.500 MHz.
Verify that the ELT’s toggle switch is set to the “
ARM
” position
1.
Remove the tape antenna and attach a 50-Ohm load. If not
available, allow at least 1 minute between tests.
2.
Test for horizontal activation by holding the ELT at arms length with
ELT in a vertical position. Swing the ELT around your body in the
horizontal plane, (like a forehand tennis swing), as fast as possible.
This may require a few tries since a great deal of force will be required
to simulate a crash. The distinctive ELT audio sweep should be heard
over the radio, and the LED should be blinking. This is not a precise
check; it only indicates that the G-switch is working. Reset the ELT.
3.
Test for vertical activation, by holding the ELT at arms length with
the antenna side pointed toward the horizon. Swing the ELT around
your body as fast as possible. The distinctive ELT audio sweep should
be heard over the radio, and the LED should be blinking. This is not a
precise check; it only indicates that the G-switch is working. Reset the
ELT.
4.
Remove the test jumper, reattach the tape antenna, and install the
ELT into its mount. Secure in place by closing latch.
SECTION 7
DESCRIPTION OF SELF-TEST MODE AND ERROR CODES
Set the ELT’s toggle switch to the spring loaded,
“
TEST-RESET
” position for 1 second and quickly release.
The self-test event occurs in the following manner:
The ELT energizes its LED/buzzer for about 1 second.
Three beacon audio sweeps are transmitted on 121.500 MHz.
One, 406.028 MHz self-test burst is transmitted.
During these transmissions, the ELT will perform a number of
internal tests on its data and electronics.
If the ELT has passed all tests, the LED/buzzer will flash/beep for one
second, and then de-energize.
If the ELT has not passed any or all of its tests, the LED/buzzer will
flash/beep for one second, and de-energize for ½ second. Following
this, error codes are indicated by one or more error indications of the
LED/buzzer.
The cadence of these on-off intervals will cause the LED/buzzer to
flash/beep for ¼ of a second interval followed by ¼ of a second de-
energized interval.
In the event that the ELT needs to signal multiple error codes, several
LED/buzzer on-off sequences will follow, one after the other, and each
sequence separated by an LED/buzzer de-energized interval of one
second.
A self-test pass is indicated by a 1-second flash/beep.
SELF-TEST ERROR CODES AND MEANINGS
4
