Operating instructions

CIRRUS AIRPLANE MAINTENANCE MANUAL MODEL SR22
25-60
Page 1
All
EFFECTIVITY:
EMERGENCY
1. DESCRIPTION
A. Emergency Locator Transmitter (ELT)
This airplane is equipped with a self-contained ELT. The ELT transmitter is installed immediately
behind the aft cabin bulkhead. The ELT is mounted slightly to the right of the airplane centerline. The
transmitter and antenna are accessible through an access panel at the base of the baggage compart-
ment bulkhead. Two different ELT models are available on the airplane. The standard ACK E-01 ELT
and the optional Artex ME406 ELT.
Serials 0002 & subs w/ ACK E-01 ELT: The transmitter unit is mounted longitudinally in the airplane in
order to detect deceleration greater than 3.5 feet per second. If rapid deceleration is detected, the
transmitter will repeatedly transmit VHF band audio sweeps at 121.5 Mhz and 243.0 Mhz approxi-
mately 0.5 seconds apart. The transmitter is automatically activated upon sensing a change of velocity
along its longitudinal axis, exceeding 3 to 5 feet per second. The transmitter can be removed from the
airplane and used as a personal locating device if it is necessary to leave the airplane after an acci-
dent.
The main transmitter control switch is labeled ON-OFF-ARMED. The transmitter is in the armed posi-
tion for normal operations. Eight dated “D” cell alkaline batteries contained within the transmitter unit
provide power to the transmitter. Replace all ELT batteries at the same time and with the same expira-
tion date stamp. The expiration date of the batteries must be indicated on the outside of the ELT bat-
tery case and recorded in the aircraft logs.
The ELT Remote Switch and Control Panel Indicator (RCPI) is located below the circuit breakers on
the circuit breaker panel. The RCPI provides test and monitoring functions for the transmitter. The
panel contains a button labeled ON, a button labeled RESET, and a red LED indicator light. The ON
button is used to test the unit in accordance with the manufacturer’s approved Instructions For Contin-
ued Airworthiness and/or other service instructions. The RESET button can be used to cancel an inad-
vertent transmission. The red light flashes when the ELT is transmitting. A Duracell PX28L or Kodak
K28L 6-volt lithium battery mounted in the panel powers the LED.
WARNING:
The ACK E-01 ELT is designed to use only Duracell MN1300 or PC 1300 alkaline
batteries which are dated by the manufacturer. This ELT does not meet the
requirements of TSO-91a or 14 CFR 91.207 if used with any other type of battery.
ELT and RCPI batteries must be inspected in accordance with the requirements of
the replacement schedule in Chapter 5. The ELT and RCPI batteries must be
replaced upon reaching the date stamped on the batteries or whenever the batter-
ies have been in use for one cumulative hour.
Refer to the manufacturer’s approved Instructions For Continued Airworthiness and/or other service
instructions.
Serials 1863 & subs w/ Artex ME406 ELT: The transmitter unit is mounted longitudinally in the airplane
in order to detect deceleration greater than 4.5 ± 0.5 feet per second. If rapid deceleration is detected,
the transmitter will repeatedly transmit 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 inter-
vals. This transmission lasts 440 ms and contains identification data programmed into the beacon and
is received by Cospas-Sarsat satellites. The transmitted data is referenced in a database (maintained
by the national authority responsible for ELT registration) and used to identify the beacon and owner.
The transmitter is automatically activated upon sensing a change of velocity along its longitudinal axis,
exceeding 4 to 5 feet per second. The transmitter can be removed from the airplane and used as a
personal locating device if it is necessary to leave the airplane after an accident.
15 Apr 2007