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beacon and owner.
The ELT transmitter is installed immediately behind the aft cabin
bulkhead, slightly to the right of the airplane centerline. The transmitter
and antenna are accessible through the avionics bay access panel
along the aft portion of the RH fuselage or the lower aft center access
panel of baggage compartment. The main transmitter control switch is
labeled “ON” - “ARM”. The transmitter is in the armed position for
normal operations. A red LED annunciator flashes when the ELT is
transmitting. A battery pack consisting of two “D” cell lithium batteries
mounts to a cover assembly within the transmitter to provide power to
the transmitter. The expiration date of the batteries are indicated on
the outside of the ELT battery case and recorded in the aircraft logs. A
warning buzzer is mounted to the transmitter mounting tray. When the
ELT is activated, the buzzer “beeps” periodically. This buzzer operates
in tandem with the ELT panel indicator and serves as a redundant
annunciation. Power to the buzzer is supplied by the ELT batteries.
Serials 0002 thru 2978, 2980 thru 2991, and 2993 thru 3001; The ELT
Remote Switch and Control Panel Indicator (RCPI) is located below
the circuit breakers on the circuit breaker panel or Serials 2979, 2992,
and 3002 and subsequent, below the Alternate Induction Air Control
knob near the pilot’s right knee.
The RCPI provides test and monitoring functions for the transmitter.
The panel contains a switch labeled “ON” - “ARM”, and a red LED
annunciator. The red LED annunciator flashes when the ELT is
transmitting. Power to the LED is supplied by either the clock bus on
the MCU (Serials 1863 thru 2083) or by a 6V lithium battery in the
RCPI (Serials 2084 and subsequent).
Revision 01: 05-13-08
6 of 8 13772-131
Section 9 Cirrus Design
Supplements SR22
Section 8 - Handling, Servicing & Maintenance
ELT and RCPI batteries must be inspected in accordance with the
Airplane Maintenances Manual, 5-20 - Scheduled Maintenance
Checks.
The ELT and RCPI batteries must be replaced upon reaching the date
stamped on the batteries, after an inadvertent activation of unknown
duration, or whenever the batteries have been in use for one
cumulative hour.
Inspection / Test
After setting transmitter switch to ARM 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, remote control panel indicator
LED, and alert buzzer.
• Note •
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. Thus it does not check the integrity of the ELT
Revision 01: 05-13-08
13772-131 7 of 8
Cirrus Design Section 9
SR22 Supplements
system or provide the same level of confidence as does an
AM radio.
1. Tune aircraft receiver to 121.5 MHz.
2. Turn the ELT aircraft panel switch "ON" for about 1 second, then
back to the "ARM" position. The receiver should transmit about 3
audio sweeps.
3. At turn-off (back to 'ARM' state) the panel LED and buzzer should
present 1 pulse. If more are displayed, determine the problem
from the list below.
4. Codes displayed with the associated conditions are as follows:
a. 1-Flash: Indicates that the system is operational and that no
　
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