CEP fitting techniques
Proper fitting of the CEP is critical to attain optimum performance as with any other piece of life support equipment. While the techniques are not complicated, they must be complied with or otherwise hearing protection and comfort may suffer.
The CEP unit is composed of two parts: screw-on foam tips (soft), and the CEP (two earplug transducers that are encased and are connected by thin wire to an SMB connector). The CEP wires have two different lengths. The CEP with the short length wire is generally for the right ear. The long wire allows the CEP to be worn either behind the head or under the chin.
The following procedure should provide a CEP fit that will yield optimum performance and best overall comfort when wearing a helmet in combination.
Attach the foam tips to each CEP transducer. Thread the foam eartip onto the CEP threaded tube until the foam touches the black housing, tightly grip the housing and the foam tip in each hand and tighten 1/4 additional turn. This will seat the rigid inner portion of the eartip into the recessed area around the base of the plastic threaded tip of the transducer. About one complete revolution of the foam tip (right hand thread) is about all that is required.
Roll the foam tip and CEP, as one unit between your thumb and first two fingers down to a small diameter (just like the standard yellow foam earplug). Holding the CEP in one hand while rotating the foam tip with the other hand may unscrew the foam tip from the earplug.
While holding the CEP housing and wire with thumb and index finger, insert the compressed eartip into the ear canal until the transducer body is inside the external ear. Very little foam should be visible at the ear canal opening. Position the transducer housing during the insertion so the wire exits through the tragus notch. When fitting earplugs, it is important that you pull your external ear up and out to the side with your free hand to straighten the ear canal while inserting the foam tip.
NEVER FORCE OR SHOVE THE TIP INTO THE CANAL. ALWAYS COMPRESS THE TIP BEFORE INSERTING. Forcing an uncompressed eartip into the ear will only pull the foam portion away, exposing the hard plastic insert. The exposed eartip may cause some pain or discomfort if it touches the ear canal.
Repeat the fitting procedure for the other ear.
When donning your helmet over the CEP, spread the earcups slightly. Pulling the helmet straight down over the ears may cause your earplug to be "readjusted".
Insert the CEP connector into the mating connector located on the lower right back edge of the helmet. The connectors are coaxial and easy to connect and disconnect. When the SMB plug is lined up with the SMB jack, press the plug until it is seated.
Insert helmet connector into the aircraft ICS in usual manner. Caution: Turn the volume settings of your ICS/Radio to a lower position before you plug your helmet into the communication system. If for some reason you suspect the CEP is not operating correctly, disconnect the CEP and adjust the ICS volume to your desired level. The earphones are still operational since the CEP interface is connected in parallel.
When the mission is completed, disconnect the CEP before removing your helmet to reduce wear and tear. Don't worry if you forget to disconnect, the CEPs will simply pull out of your ear.
Remove the CEPs by slowly pulling them out of your ears. If the earplug becomes detached from the foam tip in your ear, just screw the earplug tip back into the foam and remove slowly. Helpful Hint: Lift the side of your external ear out to the side to straighten the ear canal before removing.
Store the CEP in the hinged lid plastic container when not in use. This will help to extend the life of the eartips.
MAINTENANCE OF CEP and FOAM TIPS
We estimate a pair of foam tips will last about one month. When the foam tips become soiled, detach from CEP and wash with mild soapy water and air dry. Wash foam tips sparingly.
Discard tips if the foam degrades in any way or becomes separated from the plastic insert inside the foam.
Don't leave the CEP attached to the helmet when not in use. Care should be taken to keep the tip ends free from catching on something and being pulled off the wire ends.
Remove tips and inspect for any blockage through the center channel of the foam.
Reattach tip ensuring that the rigid center channel is inside the recessed portion of the vinyl housing.
Check wire for break in insulation. If a break is discovered, replace the CEP.
Don't step on the CEP transducer housing.
CORRECTION of INTERMITTENT SIGNAL TO CEP
The intermittent problem is caused by poor contact in the right angle connector. The tabs in the right angle connector are bending away from center and loosing contact with the center post of the SMB jack connector on the helmet. The following adjustment is a fix for the problem.
Using a push-pin, place it between the outer connector ring and the tab bending it slightly toward the center of the connector. Do this operation for each of the four tabs.
Attach the right angle connector to the helmet SMB jack connector to ensure that the tabs are not bent too far toward the center and will allow the right angle to be seated.
If this operation does not fix your problem, please contact CEP for help.