Cabin Features; Emergency Locator Transmitter (Elt) - Cirrus SR22 Pilot Operating Handbook

S 7: A
ECTION IRPLANE AND
C F
ABIN EATURES

Cabin Features

Emergency Locator Transmitter (ELT)

The airplane is equipped with a self-contained Artex ELT 1000 406 MHz
emergency locator transmitter that generates a signal to assist in search and
rescue for missing aircraft. The transmitter 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 trans-
mitted 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 bulk-
head, 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 trans-
mitter. The panel contains a two-wire switch labeled "ON" - "ARM/OFF" -
"TEST", and a red LED annunciator. The red LED annunciator flashes
when the ELT is transmitting.
7-90
S
YSTEMS
C D
IRRUS ESIGN
SR22
P/N 13772-006
Reissue A