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The C406-N se ries ELT’s em ploy a
transmitter which fea tures higher out -
put power and a more in te grated de -
sign. The 121.5/243.0 MHz sec tion of
the trans mit ter is con tained in a mod -
ule with the 406.028 MHz trans mit ter.
The top cir cuit board con tains the mi -
cro pro ces sor that con trols the mod ule
and all ELT func tions. The C406-N is
a sin gle out put ELT, un like pre vious
mod els of Artex 406 MHz ELT’s.
The ELT au to mat i cally ac ti vates dur -
ing a crash and trans mits the stan -
dard swept tone on 121.5 and 243.0
MHz. Ev ery 50 sec onds for 520 mil li -
seconds (long mes sage pro to col) the
406.028 MHz trans mit ter turns on.
During that time an en coded dig ital
message is sent to the sat ellite. Ex -
am ples of the in for ma tion that can be
contained in that mes sage are shown
be low:
· Se rial Num ber Of The Trans mit ter or
Air craft ID (24-Bit Ad dress or Tail Num -
ber).
· Coun try Code
· Cospas/Sarsat ID Code (Se ri al ized
Only)
· Po si tion Co ordinates
The 406.028 MHz trans mit ter with the
sup plied bat tery will op er ate for 24
hours, and then shut down au to mat i -
cally. The 121.5/243.0 MHz trans mitter
will con tinue to op er ate un til the unit
has ex hausted the bat tery power
which will be greater than 50 hours.
The ELT has the abil ity to com mu ni -
cate with the air craft’s nav igation sys -
tem and re ceive po si tion data
(lon gi tude and lat i tude).
Also, us ing the op tional C406-N Pro -
gramming Adapter (P/N 453-5068)
gives the ELT the abil ity to be pro -
grammed in the field with ei ther the
air craft’s 24-Bit ad dress or tail num ber.
This gives the ELT the abil ity to be
moved betwen air craft.
Re fer to Ap pendix D (Pro gramming
and Po sition Data Cir cuitry Op era -
tion) for a de tailed dis cussion of the
in ter ac tion be tween the ELT and the
air craft nav igation sys tem as well as
op er a tion and use of the Pro gramming
Adapter.
One ad van tage of the 406.028 MHz
trans mit ter is that it will pro duce a
more ac cu rate po si tion, typ ically 1 to 2
ki lo me ters as com pared to 15 to 20
ki lo me ters for 121.5/243.0 MHz trans -
mitters. When cou pled with the air -
craft’s nav i ga tion sys tem the po si tion
ac cu racy im proves to ap prox i mately
100 me ters. The ELT also trans mits a
dig i tal mes sage which al lows the
search and res cue au thor i ties to con -
tact the owner/op er a tor of the air craft
through a da tabase. In formation con -
tained in the da tabase that may be
use ful in the event of a crash is
shown be low:
· Type of Air craft
· Address of Owner
· Tele phone Num ber of Owner
· Air craft Reg is tra tion Num ber
· Alternate Emer gency Con tact
Once the ELT is ac ti vated and the
406.028 MHz sig nal is de tected from
the sat el lite and a po si tion is cal cu -
lated, the 121.5/243.0 MHz trans mis -
sions are used to home in on the
crash site.
Be cause air craft com munication ra dios
are not ca pa ble of re ceiv ing 406.028
MHz trans missions, the only method of
mon i tor ing the ELT is the blink ing
cockpit light, the buzzer or the
121.5/243.0 MHz trans missions, which
may be mon itored on the air craft
communication trans ceiver.
The switch be low the ELT cock pit
light al lows you to turn the unit on for
test ing and to re set the unit. You can -
not “dis arm” or dis able the unit from
the cock pit. Cock pit op er a tion is lim -
ited to de activating the ELT af ter it
has been ac ti vated, or man u ally ac ti -
vating the ELT.
The C406-N se ries ELT’s are housed
in a high im pact fire re sis tant
polycarbonate plas tic case. The ELT
unit is able to with stand ex tremely
harsh en vi ron ments. Units, ex actly like
yours, have been sub jected to nu mer -
ous 500g shock pulses, 1000 pound
crush weights and se vere pen e tra tion
tests, and con tinue to op er ate nor -
mally. Con tinued op eration in a tem -
perature range of -20 de grees C
through +55 de grees C is as sured.
1.2. LINE RE PLACE MENT
UNITS (LRU)
1.2.1. The C406-N se ries sys tem
consists of the fol low ing com ponents:
ELT Unit
· a. G-Switch
· b. Trans mitter
· c. Mi cro pro ces sor
· d. Mis cel la neous com po nents
· e. “ON” Light
　
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