ARTEX PRODUCTS / ACR ELECTRONICS, INC
DESCRIPTION, OPERATION, INSTALLATION AND MAINTENANCE MANUAL
C406-2 (453-5000), C406-2HM (453-5001)
570-5000 Rev. U
Company Confidential
25-62-11
Page 54 of 66
5)
Install the protective top cover assembly (452-3052) on the ELT by fitting the cover locking slots over
the locking ears on the ELT.
6)
Push the cover toward the connector end of the ELT and seat it down in place on the ELT.
7)
Route the antenna coax cables through the appropriate mounting frame cap access holes.
8)
Connect the antenna coax cables to the ELT.
9)
Connect the 12-pin harness receptacle to the ELT.
CAUTION:
INADVERTENT ACTIVATION OF THE ELT CAN HAPPEN AND IS NOT CAUSE FOR
ALARM. WAIT FIVE SECONDS, THEN TURN UNIT THE TOGGLE BACK TO THE “ARM”
POSITION. DO NOT TURN UNIT “ON” THEN IMMEDIATELY BACK TO “ARM”, THIS
WILL CAUSE THE BATTERY TO CONTINUE TO DRAIN WITH NO INDICATION OF
THE UNIT BEING “ON”. WHENEVER THE UNIT IS TURNED “ON”, ALWAYS WAIT
FIVE SECONDS BEFORE TURNING UNIT BACK TO “ARM”.
10)
Slide the mounting frame cap into place over the mounting tray and protective top cover.
11)
Secure the mounting frame cap to the mounting tray with the thumbscrews and tighten them to no
more than 18 lb-
in (203 N•cm).
12)
Tie up excess slack in the harness and coax cables, such that they form drip loops and there is
enough slack, approximately 5 in. (127 mm), to allow the mounting frame cap to be easily pulled
back.
NOTE:
Steps 1 through 11 are applicable any time the ELT has been removed and
undergoes reinstallation. Step 12 is only applicable at initial installation or if the
wiring or coax cables have been disturbed.
13)
Test the ELT installation in accordance with the requirements of SUBTASK 25-62-11-750-012 on page
33.
NOTE:
It is very important the cockpit remote switch LED immediately begins flashing
continuously upon ELT activation. If the LED fails to start flashing, recheck the
interface wiring and connections between the ELT and the cockpit remote switch.
NOTE:
If verification of the digital message (i.e., 406 MHz burst) is desired, follow the
procedures outlined in SUBTASK 25-62-11-750-010 on page 32.
SUBTASK 25-62-11-450-001
B.
Harness ELT Receptacle Sealing
1)
Seal the harness receptacle at the ELT end to prevent moisture from penetrating the connection, thus
preventing water from beading up and causing bridging between connector pins resulting in possible
activation of the ELT. Use the following procedure:
NOTE:
Perform the sealing process once all tests have been satisfactorily completed and all
harness connections have been verified to be correct.
a)
Remove the mounting frame cap from the ELT.
b)
Unplug the receptacle from the ELT or pull the receptacle free of the mounting frame cap, as
applicable.
c)
Seal the back of the receptacle with GE RTV 162, or equivalent, such that moisture cannot
penetrate the backside of the receptacle around the terminal pins.
d)
Apply Dow Corning® 4 Electrical Insulating Compound, or an equivalent meeting MIL-S- 8660C,
around the receptacle pins, such that the pin area is filled with compound.
e)
Plug the harness receptacle into the ELT.
f)
Wipe up excess sealing compound.
g)
Reinstall the mounting frame cap torquing the thumbscrews to no more than 18 lb-in. (203
N•cm).
