MOONEY INTERNATIONAL CORPORATION
M20V SERVICE AND MAINTENANCE MANUAL
Date
MAR 2017
Rev Date
Page
16
must be in place for the “G” switch to activate the unit.
The jumper is installed on the mating half of the connec-
tor so that when the connector is installed, the beacon
is armed. This allows the beacon to be handled or
shipped without “nuisance” activation (front connector
removed).
-NOTE-
The ELT can still be manually activated using the
switch on the front of the ELT. Care should be
taken when transporting or shipping the ELT not
to move the switch or allow packing material to
become lodged and toggle the switch.
Self Test Mode
Upon turn- off, the ELT automatically enters a “Self-
Test Mode.” The ELT transmits a 406 MHz test coded
pulse that monitors certain system functions before en-
tering the “ARM”ed mode. The 406 MHz test pulse is
ignored by any satellite that receives the signal, but the
ELT uses this output to check output power and correct
frequency. If the ELT is left activated for approximately
50 seconds or greater, a distress signal is generated
that IS accepted by one or more SAR satellites. There-
fore, when the self- test mode is required, the ELT must
be activated then, returned to “ARM” within about 45
seconds, otherwise a live distress message will be
transmitted.
-NOTE-
All activations of the ELT should be kept to a
minimum. Local or national regulations may limit
testing of the ELT or special requirements or
conditions to perform testing. For the “Self-
Test,” it is recommended that the ELT be “ON”
for more than 5 seconds during th e first 5 min-
utes after the hour.
In addition to output power of the 121.5/406 MHz sig-
nals and 406 MHz frequency, other parameters of the
ELT are checked and a set of error codes generated if a
problem is found. The error codes are displayed by a
series of pulses of the ELT LED, remote LED and alert
buzzer. See “Transmitter Test” for more details and a
description of the error codes.
-WARNING-
Do not allow test duratio n to exceed 5 seconds.
Any time the ELT is activated it is transmitting a
121.5 MHz distress signal. If the unit operates
for approximately 50 seconds, a “live” 406 MHz
distress signal is transmitted and is consid-
ered valid by the satellite system. Any time that
the ELT is cycled from “ARM” to “ON” and then
back to “ARM,” a 406 MHz signal is transmitted,
however it is specially coded as a “self test”
signal that is ignored by the COSPAS- SARSAT
satellites.
Transmitter Test
Always perform the tests within the first 5 minutes of the
hour. Notify any nearby control tower of your intentions,
in accordance with AC 43.13.1B, Section 12- 22, Note
3. If outside the U.S., always follow all local or national
regulations for testing of ELTs.
Self Test
Tune a receiver (usually the aircraft radio) to 121.5
MHz. Turn the ELT aircraft panel switch “ON” for about
1 second, then back to the “ARM” position. The receiv-
er should voice about 3 audio sweeps.
At turn- off (back to the “ARM” state) the panel LED and
buzzer should present 1 pulse. If more are displayed,
determine the problem from the list below.
Codes displayed with the associated conditions are as
follows:
1 Flash - Indicates that the system is operational
and that no error conditions were found.
3 Flashes - Bad load detect. Detects open or short
condition on the antenna output or cable. These prob-
lems can probably be fixed by the installer.
Check that the RF cable is connected and in good
condition. Perform continuity check of center conductor
and shield. Check for a shorted cable.
Check for intermittent connection in the RF cable.
If this error code persists, there may be a problem
with the antenna installation. This can be checked with
a VSWR meter. Check the antenna for opens, shorts,
resistive ground plane connection.
4 Flashes - Low power detected. Occurs if output
power is below about 33 dBm (2 watts) for the 406 sig-
nal or 17 dBm (50 mW) for the 121.5 MHz output. Also
indicate that 406 signal is off frequency. For this error
code the ELT must be sent back for repair or replace-
ment.
5 Flashes - Indicates that the ELT has not been pro-
grammed. Does not indicate erroneous or corrupted
programmed data.
6 Flashes - Indicates that the G- switch loop be-
tween pins 5 and 12 at the D- sub connector is not in-
stalled. ELT will not activate during a crash.
Check that the harness D- sub jumper is installed
by verifying less than 1 ohm of resistance between pins
5 and 12.
7 Flashes - Indicates that the ELT battery has too
much accumulated operation time (>1 hr.). Battery may
still power ELT; however, it must be replaced to meet
FAA specifications. May also indicate damage to the
battery circuit.
Remote Switch LED always ON (Steady) - Indi-
cates wiring error or frayed wires shorting out pins on
back of Remote Switch. To correct, verify wiring and in-
tegrity of all crimp or solder connections on harness.
Self- Test Schedule
Artex recommends that the ELT be tested every 1- 2
months. Follow steps outlined above. Note: the self-
test time is accumulated in a register on the battery
39-12-00
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