ARTEX PRODUCTS / ACR ELECTRONICS, INC
DESCRIPTION, OPERATION, INSTALLATION AND MAINTENANCE MANUAL
C406-1 (453-5002), C406-1HM (453-5003)
Page 55 of 67
Feb 28/2019
25-62-10
2)
Verify the ELT local switch is in the “OFF” position.
3)
Insert the ELT into the mounting tray at an angle, such that the locking ears at the end opposite the
direction-of-flight arrow fit into the mounting tray locking slots.
4)
Press the ELT down until it is fully seated in the mounting tray.
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 cable through the appropriate mounting frame cap access hole.
8)
Connect the antenna coax cable to the ELT.
9)
Connect the 12-pin harness receptacle to the ELT.
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 cable, 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 cable
has been disturbed.
13)
Test the ELT installation in accordance with the requirements of SUBTASK 25-62-10-750-011 on page 37.
NOTE: It is very important the cockpit remote switch LED immediately begins flashing
continuously upon ELT activation. If the light 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 25-62-10-750-010 on page 32.
SUBTASK 25-62-10-450-001
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).
