Section 2. Maintenance Schedule for the DESCO Air Hat
The DESCO Air Hat is simple to maintain and will provide reliable service with normal care and maintenance.
The following schedule will keep your DESCO Air Hat in top working order.
Before each dive:
1. Inspect all seals for nicks and tears. Replace as necessary.
2. Inspect the window for nicks, cracks, and deep scratches, which may weaken it. Pay special attention to
the screw holes.
3. Check the window screws for damage and tightness.
4. Check the air control valve for smooth operation. There should be some resistance to opening and
closing of the valve to prevent accidental readjustment during the dive.
5. Inspect the clamp and lock mechanism for damage and adjustment. . There should be some resistance to
opening and closing of the clamps and locks to prevent accidental opening during the dive.
6. Inspect the shell of the helmet for damage. Pay special attention to fittings and joints
7. Inspect the insert ring for damage. Also inspect the O-Ring, shim (if installed), and neck dam (if
installed).
8. Test the air train. With air connected check the operation of the non-return valves and air train. Close the
air control valve to pressurize the air train. Turn off the compressed air supply to the helmet. After one
minute open the air control valve. Air should be heard escaping from the air distributor. If no air is heard
check all fittings for leakage, repair and retest.
Periodic Maintenance:
Due to the varying conditions that DESCO Air Hats will encounter it is not possible to suggest a fixed
interval for periodic maintenance. The compressor, umbilical, environment, and usage will all effect how
often the Air Hat will need comprehensive maintenance. Particular attention should be paid to these items
when doing periodic maintenance. DESCO recommends that the periodic maintenance be done fairly often.
It is not possible to over maintain a DESCO Air Hat.
1. Check Lambswool in the Air Diffuser for discoloration and/or particulate matter. Replace if any
contamination is observed.
ONLY USE Lambswool in the Air Diffuser.
Use of any other material in
the Air Diffuser is not recommended.
2. Check the threading on the non-return valves for wear, dirt, or damage.
When reassembling the Air
Hat never use Teflon Tape in any part of the air train. Loose pieces of tape can clog the
Lambswool or air control valve and result in loss of airflow.
3. Check all items, which are not easily accessible during the pre dive inspections.
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