Backplate and harness:

• Check that the backplate is in good condition and free of damage and excess wear.
• Check that the harness is clean and free of damage. Also check it slides freely through buckles.

Pneumatics:

• Check cylinder connector o-ring is cleaned and undamaged.
• Screw hand wheel connector firmly into the cylinder valve outlet.
• Check that pressure gauge, whistle and hoses are in good condition and are not stretched.

Check Demand Valve:

• Check that the demand valve o-ring is clean and undamaged.
• Fit the demand valve to the face-mask. Check that the locking catch clicks into place.

Check Face-mask:

• Check that the face-mask is clean and undamaged and check if vision is clear.
• Place chin in face-mask chin cup and pull the head harness over the head.
• Tightened head harness in sequence bottom – middle – top.
• Open the cylinder valve and check that the cylinder is full.
• Check that the face-mask pressurises. If necessary, adjust the mask to obtain a leak tight fit.
• Do not over tightened the harness as it distorts the mask.

Pressure and leak test:

• Insert fingers in the face-mask seal and check there is steady flow of air out of the mask. Remove fingers and allow mask to reseal.
• Close the cylinder valve, hold your breath and monitor the pressure gauge for 10 sec. Check that the pressure does not change during the period.

Whistle Test:

• Monitor the pressure gauge, breath down air in the system and check that the whistle sounds clearly between 50 and 60 bars.
• Release head harness and remove face-mask.

Final checks:

• Check that all parts are clean and undamaged.
• Ensure that the shoulder harness is fully slackened and that a full cylinder is securely attached.
• Replace discharged cylinder.
• If any check fails, attach an explanatory note to apparatus and return it to be serviced.