Cirrus SR20 Specifications Page 301

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P/N 11934-S36 5 of 8
Cirrus Design Section 9
SR20 Supplements
Section 7 - Systems Description
This airplane is equipped with a self-contained Artex ME406 406 MHz
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. Once activated, the transmitter 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 ms and contains
identification data received by Cospas-Sarsat satellites. 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”. 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 1005 thru 2015; The ELT Remote Switch and Control Panel
Indicator (RCPI) is located below the circuit breakers on the circuit
breaker panel or Serials 2016 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 the clock bus on the
MCU.
Revision 01: 12-18-08
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