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on the DDU and BAC start to ash red. If equipped, an optional secondary audible
electronic low air warning will also be activated when the air supply has dropped to
33% (see section 1.7).
These indications will continue until almost all air has been used up.
NOTE! NFPA 1404 STANDARD FOR FIRE SERVICE RESPIRATORY PROTECTION TRAINING REQUIRES WRITTEN
STANDARD OPERATING PROCEDURES FOR TRAINING IN THE USE OF RESPIRATORY PROTECTION EQUIPMENT
THAT SHALL INCLUDE AN INDIVIDUAL AIR MANAGEMENT PROGRAM. NFPA 1404 STATES THAT THE AIR
MANAGEMENT PROGRAM SHALL INCLUDE THE FOLLOWING DIRECTIVES:
(1) THE INDIVIDUAL SHALL EXIT FROM AN IDLH ATMOSPHERE BEFORE CONSUMPTION OF RESERVE AIR SUPPLY
BEGINS.
(2) THE INDIVIDUAL SHALL RECOGNIZE THAT THE LOW AIR ALARM NOTIFICATION INDICATES THAT THE MEMBER
IS CONSUMING THE RESERVE AIR SUPPLY.
(3) THE INDIVIDUAL AND THE TEAM SHALL TAKE IMMEDIATE ACTION UPON ACTIVATION OF THE RESERVE AIR
ALARM AND SHALL FOLLOW THEIR DEPARTMENT’S SOP/SOG.
CAUTION! THE USER MUST HEED THE LOW AIR WARNING AND START RETREATING IMMEDIATELY. CORRECT
PLANNING AND TRAINING FOR ANY OPERATION INVOLVING THE USE OF BREATHING APPARATUS IS
ESSENTIAL.
WARNING! IF THE HUD SHUTS DOWN THE USER MUST LEAVE THE CONTAMINATED AREA.
NOTE! IF THE APPARATUS IS USED AT AMBIENT TEMPERATURES OF 32ºF OR BELOW AND WETTED WITH WATER,
EXTERNAL ICING CAN CAUSE MALFUNCTIONS OF THE ACOUSTIC WARNING DEVICE. IN THE CASE OF LOW
TEMPERATURES THE APPARATUS PRESSURE GAUGE MUST BE READ MORE FREQUENTLY.
6.5 EMERGENCY OPERATION
There are two major failure modes which require immediate corrective action: loss of
demand air supply and free ow of the air supply.
1. Should you be unable to inhale easily, rst verify that you have not run out of air
by reading the chest mounted pressure gauge. Then check that the cylinder valve
is fully open. If the air supply is insufcient, reach up with your left hand and turn
the red by-pass knob to add air. You can regulate the air ow easily by opening
and closing this valve. Leave the contaminated area.
CAUTION! THE BY-PASS SHOULD ONLY BE USED IN A LOSS OF DEMAND AIR SUPPLY EMERGENCY ESCAPE
SITUATION. USE OF THE BY-PASS IN NORMAL SCBA OPERATIONS IS NOT RECOMMENDED AS IT INCREASES AIR
USAGE, WHICH WILL SHORTEN THE DURATION OF THE AIR SUPPLY.
WHEN USED IN AN EMERGENCY ESCAPE OPERATION, THE BY-PASS SHOULD BE REGULATED ONLY TO THE
FLOW LEVEL REQUIRED TO SUPPLY AIR TO THE USER. OPENING THE BY-PASS FULLY, OR TO HIGH FLOW LEVELS,
WILL EXPOSE THE USER TO RISK OF CONTACT WITH EXTREMELY COLD AIR IN THE MASK AND ADDITIONALLY,
SHORTEN THE DURATION OF THE AIR SUPPLY.
2. Should the unit free ow, you will notice air blowing into the facepiece and out
of the exhalation valve. Use the cylinder valve as the control by reaching back
with your right hand and closing the valve, opening as required. Leave the
contaminated area.
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