Specifications

The in for ma tion sent to the sat el lite
is pro grammed at the fac tory and con -
tains a unique num ber that can be
used to iden tify the bea con.
1.3. FCC REQUIREMENT
The ELT shall main tain a fre quency
sta bil ity of 50 parts per mil lion on
121.5 and 243.0 MHz. This al lows a
vari a tion of plus or mi nus 6.075 KHz
at 121.5 MHz.
On any fre quency re moved from the
as signed fre quency by more than 50
per cent up to and in clud ing 100 per
-
cent of the au tho rized band width the
power is to be at ten u ated at least 25
dB.
On any fre quency re moved from the
as signed fre quency by more than 100
per cent up to and in clud ing 250 per-
cent of au tho rized band width the
power is to be at ten u ated at least 35
dB.
On any fre quency re moved from the
as signed fre quency by more than 250
per cent of the au tho rized band width
the power is to be at ten u ated at least
40 dB.
There are no equiv a lent FCC re quire -
ments for the 406.025 MHz fre quency.
1.4. TSO RE QUIRE MENTS
To gain TSO ap proval of a 406.025
MHz ELT it is nec es sary to meet the
re quire ments of TSO C126. The follow-
ing sec tions con tain de scrip tions of
com po nents nec es sary to meet TSO
C126 with the ARTEX C406-2 se ries
ELT’s.
1.4.1. AC TI VA TION MON I TOR
An au ral and/or vi sual mon i tor is pro
-
vided to alert the pi lot when the ELT
has been ac ti vated and is trans mit ting.
The fol low ing re quire ments ap ply to
the ac ti va tion mon i tors:
a. Au ral Mon i tor - The au ral mon i tor
pro vides a dis tinct sig nal en abling a
search and res cue team to lo cate an
air craft with a trans mit ting ELT in a
con fined area with a large num ber of
air craft (i.e. such as an air port). The
search and res cue team would lis ten
for the au ral mon i tor and eas ily lo cate
and dis able the of fend ing ELT with out
a great deal of ef fort.
b. Vi sual Mon i tor - The vi sual mon i -
tor is de signed to be in stalled so that
it can be viewed from the pi lot’s po si -
tion. Its in tended func tion is to in form
the pi lot that the ELT is trans mit ting,
avoid ing a sit u a tion where an air craft
is fly ing with its ELT trans mit ting.
1.4.2. G-SWITCH
The crash force ac ti va tion sen sor or
G-Switch is de signed to ac ti vate with
a change of ve loc ity of 4.5 fps +/-0.5
fps both un der nor mal con di tions and
while be ing sub jected to 30 G’s of
cross axis forces. Fig ure 1-1 shows
the plot of time ver sus G Force that
the G-Switch must be qual i fied to in
or der to meet ED-62 ap proval cri te ria.
The FAA has al lowed the use of this
G-Switch un der TSO C126.
1.4.3. BAT TERY PACK
The Bat tery Pack for all the C406-2
se ries ELT’s con sists of 4 “D” size
ARTEX AIRCRAFT SUPPLIES DOCUMENT #570-5000
06/30/99 PAGE1-5