Specifications

nec tions on the ELT. Po si tion the end
cap and con nec tor as sem bly onto the
ELT and tighten the two thumb screws se -
curely. Vi sually in spect con nec tions en sur -
ing that they are seated prop erly.
4.3.16 (Step 7) In stalled Trans -
mit ter Test (Self Test)
Per form the trans mit ter tests by ac ti vat -
ing the ELT and lis ten ing on 121.5 MHz.
Be sure to fol low the pro ce dures as out
-
lined un der “Trans mit ter Test” in Sec tion
3, page 3-17 of this man ual.
•
If your ELT front panel in di ca tor light is
wired through ei ther the air craft mas ter
or the avi on ics mas ter switch, make
sure these switches are turned on.
•
Tune a re ceiver (usu ally the air craft ra
-
dio) to 121.5 MHz.
•
Turn the ELT air craft panel switch to
“ON”, wait for 3 sweeps on the re ceiver,
which takes about 1 sec ond, and then
turn the switch back to the “ARM”
(OFF) po si tion while pay ing spe cial at -
ten tion of the LED ac tiv ity upon en ter ing
the “ARM” (OFF) con di tion.
To pass the test, you must hear the 3
sweeps AND see the front panel light im
-
me di ately be gin to flash con tin u ously.
Dur ing the ON to OFF tran si tion, the mi -
cro pro ces sor in the ELT checks the
“G-Switch” (au to matic ac ti va tion switch)
latch ing cir cuit, pins 5 & 8 on the 12-pin
con nec tor at the ELT; the 406.025 MHz
trans mit ter for proper RF out put; that po si-
tion data is pres ent and a bat tery check.
If the ELT is work ing prop erly, the se-
quence fol low ing en try to the “ARMED”
(OFF) con di tion will re sult in the panel
LED stay ing il lu mi nated for ap prox i mately
1 sec ond, then ex tin guish ing.
If a prob lem is de tected, the LED pro-
vides a coded sig nal fol low ing the ini tial
1 sec ond pulse. The coded sig nal and
re lated prob lem are as fol lows:
• a) 1 flash in di cates a G-switch loop
open fail ure.
•
b) 3 flashes in di cates a 406.025 MHz
trans mit ter prob lem (i.e. bad or un con -
nected coax ca ble, an an tenna prob -
lem, low power out put or a pro gram
-
ming er ror).
• c) 5 flashes in di cates there is no nav i -
ga tion data pres ent. This is most likely
due to im proper wir ing be tween the
sys tem in ter face con nec tions, im proper
pro gram ming, in valid nav i ga tion data or
an ELT/NAV In ter face unit (453-6500)
is not be ing uti lized.
• d) 7 flashes in di cates a bat tery prob lem
(i.e. bat tery us age time over an hour).
There is a se quence as signed to the
prob lem re port which is the same or der
as listed above. If the G-switch cir cuit
has a fail ure, there will be a sin gle flash.
If there also is a 406.025 MHz trans mit -
ter prob lem then af ter the sin gle flash
and a 1 sec ond pause, 3 flashes would
ap pear.
NOTE: For in stal la tions us ing t h e
ELT/NAV In ter face, there is an er ror con-
di tion where the LED on the ELT and re
-
mote switch will flash rap idly. This oc curs
2 min utes af ter power is ap plied to the
ELT/NAV In ter face if the ELT is not re -
spond ing be cause ei ther 1) the ELT is
pro grammed for a pro to col other than 24
bit and the ELT/NAV In ter face has been
strapped for a 24 bit ad dress or 2) the
RS-232 TX line from the ELT (pin 12) to
the ELT/NAV In ter face (pin 10) is not
con nected.
ARTEX AIRCRAFT SUPPLIES DOCUMENT # 570-5000
04/11/01 PAGE 4-13