ARTEX PRODUCTS / ACR ELECTRONICS, INC
DESCRIPTION, OPERATION, INSTALLATION AND MAINTENANCE MANUAL
ELT 345 (P/N: A3-06-2880)
Page 31 of 58
25-62-35
SUBTASK 25-62-35-750-011
P.
Antenna Test – Item 7
CAUTION:
DO NOT ALLOW THE DURATION OF THIS TEST TO EXCEED 5 SECONDS.
1)
Tune a low quality AM receiver (i.e., radio) to 121.5 MHz.
NOTE:
The aircraft transceiver is not recommended for this test, because it is too sensitive to verify
the integrity of the antenna system and it may pick up a weak signal even if the antenna is
disconnected from the ELT. An AM radio provides a better level of confidence for this test.
2)
Place the radio approximately six inches from the antenna.
3)
Activate the ELT (cockpit remote switch to the ON position).
NOTE:
Perform this test within the first five minutes after the hour UTC.
4)
Listen for 3 audible sweeps on the radio, which takes about 1 second. An audible signal verifies energy is being
transmitted by the antenna.
5)
Reset the ELT (cockpit remote switch to the ARM position).
SUBTASK 25-62-35-750-012
Q.
Inspection and Test Documentation – Item 8
1)
Make an appropriate entry in the aircraft maintenance records (i.e., logbook), including the date the ELT
inspection and testing was satisfactorily completed.
2)
For aircraft operating under Canadian authority, following satisfactory completion of performance testing, the
date on which the test was performed shall be marked on the ELT external casing in a legible and permanent
manner.
TASK 25-62-35-810-801
3.
Fault Isolation
SUBTASK 25-62-35-810-001
A.
Self-Test
1)
The self-test checks certain critical functions in the beacon. Results of the test are displayed by a series of
indications (flash codes), where the status LED, remote switch LED and buzzer(s) activate for ½ second ON,
followed by ½ second OFF. Multiple flash codes are separated by periods of 1.0 second. If no errors are
present, a 2 second flash is presented as a ‘system ok’ indication. This is suppressed if errors are present.
NOTE:
Distinct indication that 406 MHz and 121.5 MHz RF power emitted is confirmed by observing
any sequence of local LED pulse, remote light or horn, with an exception of four pulses of ½
second of the local LED, remote light, and horn, which indicate RF failure.
2)
Perform the self-test using the following steps:
a)
Push switch lever to SELF-TEST position for approximately 1 second, then release. Error codes will begin to
display after about 1 second.
b)
Regardless of how long the ELT has been in the active state, no self-test is performed at turn off using the
2-wire switch.