Specifications

•
Turn the ELT “OFF”.
•
Dis con nect the test har ness 611-0024.
•
Re con nect the 2-pin mod ule power har
-
ness.
• Re in stall the bat tery pack as de scribed
in Sec tion 4.3.4
4.3.13 (Step 5h) Ver i fi ca tion of
Dig i tal Mes sage
Set up the equip ment as shown be low:
NOTE: If check ing the lat i tude/lon gi tude,
en sure that the air craft’s nav i ga tion sys
-
tem and ELT/NAV In ter face are con nected
and pow ered on at least 30 sec onds prior
to ac ti va tion of the ELT.
Ac ti vate the ELT and al low the ELT to
trans mit 15 to 30 sec onds but not more
than 40 sec onds. The SARSAT Bea con
Tester will re ceive the “test mes sage”
trans mit ted at turn off. If the 406.025
MHz os cil la tor is not warmed up and sta
-
bi lized, a “BAD FRAME” mes sage m a y
oc cur, which could be con strued a s a
prob lem when, in fact, the mes sage was
gen er ated be cause the os cil la tor had not
warmed up. If a “BAD FRAME” is re
-
ceived, re peat the ac ti va tion and turn off
pro ce dure again. For all test ing of the
406 MHz out put, only the “test mes sage”
that is trans mit ted at turn off is re quired
to ver ify the ELT and ELT/NAV In ter face
func tion. The test mes sage con tains all
the in for ma tion con tained in the ac tual
dis tress mes sage ex cept there is a spe
-
cial dig i tal test pre fix that tells the
COSPAS/SARSAT sat el lites to ig nore the
mes sage.
Note: The ini tial dis play on the SARSAT
Bea con Test Set can flag sev eral prob-
lems prior to ad vanc ing into the in di vid ual
Page dis plays de scribed later.
a) if a “BAD FRAME” mes sage ap pears
af ter the 3rd or 4th trans mit at tempt, the
Bea con Test Set is not re ceiv ing trans mit
data. Ver ify that the SARSAT Bea con
Test Set does not have a low bat tery.
Check the coax con nec tion be tween the
ELT’s TPS con nec tor and the SARSAT
Bea con Test Set. Check the in ter nal ELT
coax con nec tion be tween the TPS con
-
nec tor and the 406.025 MHz mod ule.
Finally, try a dif fer ent bat tery pack.
b) if a “S’ TEST BAD” or “DATA ER-
ROR” mes sage ap pears, there is a prob
-
lem with the ELT (i.e. a pro gram ming
prob lem or a prob lem with the trans mit ter
mod ule) or the bat tery pack.
c) if there is no 406.025 MHz trans mit -
ter burst pres ent, check the 3.0 Amp
fuse on the cir cuit board in the bat tery
pack for an open con di tion. If the fuse is
good, there is most likely a prob lem with
the 406.025 MHz mod ule or its in ter con -
nec tions.
24 Bit Ad dress Pro to col (Long Mes -
sage)
Re fer to Fig ure 4-3A and 4-3B for the
Bea con Test Set dis play con tents of each
spe cific page de scribed be low.
Page 1 is the main menu screen. Press
“V” for view to see re ceived mes sage or
scroll us ing “up” and “down” ar row keys
to view other mes sages. Use “left” and
“right” ar row keys to scroll be tween
pages.
Page 2 con tains the Date and Time
that the mes sage was re ceived. Also in -
cluded is an in di ca tion of whether the
mes sage was re ceived prop erly. Ver ify
that the third or bot tom line reads “S’
TEST OK”.
ARTEX AIRCRAFT SUPPLIES DOCUMENT # 570-5000
04/11/01 PAGE 4-9
30 dB min.
Attenuator
SARSAT
Beacon
Test Set
ELT
TPS (Bottom)
Connector