B. harness elt receptacle sealing – ACR&Artex C406-2 HM User Manual

Page 71

25-62-11

Page 71 of 87

JUN 20/13

ACR ELECTRONICS, INC / ARTEX PRODUCTS

DESCRIPTION, OPERATION, INSTALLATION AND MAINTENANCE MANUAL

C406-2 (453-5000), C406-2HM (453-5001)

(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 25-62-11-750-011

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

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).