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annunciator. The red LED annunciator flashes when the ELT is
transmitting. Power to the LED is supplied by the clock bus on the
MCU.
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Section 9 Cirrus Design
Supplements SR20
Section 8 - Handling, Servicing & Maintenance
ELT and RCPI batteries must be inspected in accordance with the
Airplane Maintenances Manual, 5-20 - Scheduled Maintenance
Checks.
The ELT and RCPI batteries must be replaced upon reaching the date
stamped on the batteries, after an inadvertent activation of unknown
duration, or whenever the batteries have been in use for one
cumulative hour.
Inspection / Test
After setting transmitter switch to ARM position, the ELT automatically
enters a self-test mode. The self-test transmits a 406 MHz test coded
pulse that monitors certain system functions before shutting off. The
test pulse is ignored by any satellite that receives the signal, but the
ELT uses this pulse to check output power and frequency. Other
parameters of the ELT are checked and a set of error codes is
generated if a problem is found. The error codes are indicated by a
series of pulses on the transmitter LED, remote control panel indicator
LED, and alert buzzer.
• Note •
FAA regulations require that transmitter tests only be done
during the first 5 minutes of each hour and must not last for
more than 3 audio sweeps (1.5 seconds). If you are at a
location where there is an FAA control tower or other
monitoring facility, notify the facility before beginning the tests.
Never activate the ELT while airborne for any reason.
Operators may wish to use a low quality AM broadcast
receiver to determine if energy is being transmitted from the
antenna. When the antenna of the radio (tuning dial on any
setting) is held about 6 inches from the activated ELT antenna,
the ELT aural tone will be heard on the AM broadcast receiver.
This is not a measured check, but it does provide confidence
that the antenna is radiating sufficient power to aid search and
rescue. The aircraft’s VHF receiver, tuned to 121.5 MHz, may
also be used. This receiver, however, is more sensitive and
could pick up a weak signal even if the radiating ELT’s antenna
is disconnected. Thus it does not check the integrity of the ELT
Revision 01: 12-18-08
P/N 11934-S36 7 of 8
Cirrus Design Section 9
SR20 Supplements
system or provide the same level of confidence as does an
AM radio.
1. Tune aircraft receiver to 121.5 MHz.
2. Turn the ELT aircraft panel switch "ON" for about 1 second, then
back to the "ARM" position. The receiver should transmit about 3
audio sweeps.
3. At turn-off (back to 'ARM' state) the panel LED and buzzer should
present 1 pulse. If more are displayed, determine the problem
from the list below.
4. Codes displayed with the associated conditions are as follows:
a. 1-Flash: Indicates that the system is operational and that no
error conditions were found.
b. 2-Flashes: Not used. If displayed, correct condition before
further flight.
c. 3-Flashes: Open or short circuit condition on the antenna
output or cable. If displayed, correct condition before further
flight.
d. 4-Flashes: Low power detected. If displayed, correct condition
before further flight.
e. 5-Flashes: Indicates that the ELT has not been programmed.
Does not indicate erroneous or corrupted programmed data. If
displayed, correct condition before further flight.
f. 6-Flashes: Indicates that G-switch loop is not installed. If
displayed, correct condition before further flight.
g. 7-Flashes: Indicates that the ELT battery has too much
accumulated operation time (> 1hr). If displayed, correct
condition before further flight.
Section 10 - Safety Information
No Change.
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Section 9 Cirrus Design
Supplements SR20
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Intentionally Left Blank
P/N 11934-S40 1 of 20
Cirrus Design Section 9
SR20 Supplements
Pilot’s Operating Handbook and
FAA Approved Airplane Flight Manual
Supplement
for
S-Tec Fifty Five SR Autopilot
(Aircraft Serials w/ Perspective Avionics Only)
When the System Fifty Five SR Autopilot is installed on the aircraft,
this POH Supplement is applicable and must be inserted in the
Supplements Section (Section 9) of the basic Pilot’s Operating
Handbook. This document must be carried in the airplane at all times.
Information in this supplement adds to, supersedes, or deletes
information in the basic Pilot’s Operating Handbook.
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