C
IRRUS
D
ESIGN
S
ECTION
8: H
ANDLING
AND
S
ERVICING
SR20
S
ERVICING
P/N 11934-005
8-19
Artex ELT 1000 Servicing
The ELT batteries must be inspected in accordance with the Airplane
Maintenance Manual, 5-20 - Scheduled Maintenance Checks.
The ELT batteries must be replaced upon reaching the date stamped on the
batteries, after an inadvertent activation of unknown duration, or when-
ever the batteries have been in use for one cumulative hour.
Inspection / Test
After setting transmitter switch to TEST position, the ELT automatically
enters a self-test mode. The self-test transmits a 406 MHz test coded pulse
that monitors certain system functions before shutting off. The test pulse is
ignored by any satellite that receives the signal, but the ELT uses this pulse
to check output power and frequency. Other parameters of the ELT are
checked and a set of error codes is generated if a problem is found. The
error codes are indicated by a series of pulses on the transmitter LED, the
Remote Switch and Control Panel Indicator (RCPI) LED, and alert buzzer.
• N
OTE
•
FAA regulations require that transmitter tests only be done
during the first 5 minutes of each hour and must not last for more
than 3 audio sweeps (1.5 seconds). If you are at a location where
there is an FAA control tower or other monitoring facility, notify
the facility before beginning the tests. Never activate the ELT
while airborne for any reason.
Operators may wish to use a low quality AM broadcast receiver to
determine if energy is being transmitted from the antenna. When
the antenna of the radio (tuning dial on any setting) is held about
6 inches from the activated ELT antenna, the ELT aural tone will
be heard on the AM broadcast receiver. This is not a measured
check, but it does provide confidence that the antenna is radiating
sufficient power to aid search and rescue. The aircraft’s VHF
receiver, tuned to 121.5 MHz, may also be used. This receiver,
however, is more sensitive and could pick up a weak signal even if
the radiating ELT’s antenna is disconnected. Therefore, it does
not check the integrity of the ELT system or provide the same level
of confidence as does an AM radio.
To Service Artex ELT 1000
1.
Tune aircraft receiver to 121.5 MHz.
2.
Push switch lever to TEST position for approximately 1 second, and
then release.
3.
Results of the test are displayed by a series of indications (flash codes),
where the local LED, remote switch LED and buzzer(s) activate for ½
second ON, followed by ½ second OFF. Error codes, indicated by
Reissue A
