P/N 13772-131
5 of 8
Cirrus Design
Section 9
SR22 / SR22T
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
22-
0002 thru
22-
2978,
22-
2980 thru
22-
2991, and
22-
2993 thru
22-
3001:
The ELT Remote
Switch and Control Panel Indicator (RCPI) is located below the circuit
breakers on the circuit breaker panel or
Serials
22-
2979,
22-
2992, and
22-
3002 and subsequent, 22T-0001 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
22-
1863 thru
22-
2083)
or by a 6V lithium battery in
the RCPI
(Serials
22-
2084 and subsequent, 22T-0001 and
subsequent).
Revision 02: 01-06-10
