Cirrus SR22 Pilot Operating Handbook page 454

Section 9 Cirrus Design
Supplements SR22 / SR22T
Section 7 - Systems Description
The airplane is equipped with a self-contained Artex ELT 1000 406
MHz emergency locator transmitter (ELT) system. The transmitter unit
is automatically activated upon sensing a change of velocity along its
longitudinal axis exceeding 4 to 5 feet per second, or upon sensing
deployment of the Cirrus Airframe Parachute System (CAPS). Once
activated, the ELT transmits VHF band audio sweeps at 121.5 MHz
until battery power is gone.
In addition, for the first 24 hours of operation, a 406 MHz signal is
transmitted at 50-second intervals. This transmission lasts 440
milliseconds and contains aircraft-specific information and GPS
position data provided by the Garmin avionics. The transmitted data is
referenced in a database maintained by the national authority
responsible for ELT registration to identify the 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/OFF" -
"TEST". 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 is indicated on the
outside of the ELT battery case and recorded in the aircraft logs.
A warning buzzer is mounted to the ELT shelf. 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.
ELT Remote Switch and Indicator Panel
The Artex ELT 1000 Remote Switch and Control Panel Indicator
(RCPI) is located 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 two-wire switch labeled "ON" -
4 of 6 P/N 13772-156
Original Issue: 11-20-14