62 Questions
What is the purpose of this SOP?
To describe the procedures for using the MSA G1 SCBA
What is the MSA G1 SCBA?
A pressure demand self-contained breathing apparatus
What is the function of the inhalation valve in the face piece of the SCBA?
Minimize fogging inside the lens
What is the role of the mask mounted regulator in the SCBA?
Maintains positive pressure in the face piece
What does the Heads-Up Display (HUD) in the SCBA allow users to see?
Cylinder pressure and alarm status
What additional feature does the SCBA have apart from being a breathing apparatus?
Integrated personal alert safety system (PASS)
What is the purpose of the lumbar pad in the harness and carrier assembly?
To provide additional lumbar support
What is the function of the Emergency Breathing Support System (EBSS) manifold?
To share intermediate air pressure with another user
What is the role of the pressure reducer with primary low pressure warning device?
To reduce the air pressure from the cylinder to the second stage regulator
What function does the HUD fulfill in the SCBA system?
Receive information on SCBA and power from the power module
What is the purpose of the speaker module on the left shoulder strap?
Amplify and clarify speech during use
What is the function of the Personal Alert Safety System (PASS) device?
Monitor movement through a motion sensor
What component allows two users to connect and share intermediate air pressure?
Emergency Breathing Support System (EBSS) manifold
What does the primary low pressure warning device (bell) in the pressure reducer do?
Alarms when there is approximately 35% of the SCBA’s rated service time remaining
What does the power module in the Personal Alert Safety System (PASS) device emit?
Audible PASS alarms and pre-alarms with four (4) buddy lights
What does the lumbar pad provide in the harness and carrier assembly?
Additional lumbar support that can be adjusted while worn
What is the purpose of the HUD's 7 LEDs separated on the left and right sides?
To improve visibility and clarity
What does the Emergency Breathing Support System (EBSS) manifold allow users to do?
Connect and share intermediate air pressure with another user
What should be done if the SCBA does not successfully pass any portion of the Daily Mask Check and/or visual inspection?
Take the unit out of service and contact BEARS
What action should be taken if the cylinder is not fully pressurized during the SCBA harness donning process?
Contact BEARS for guidance
What should be done if the primary low pressure warning device fails to alarm while donning the SCBA face piece?
Stop using the SCBA immediately and contact BEARS
What is the correct procedure if there are air leaks while donning the SCBA harness?
Stop using the SCBA and check for air leaks
What should be done if the face piece does not stay collapsed on the face during the tightness test?
Stop using the SCBA and report the issue
What should be done if increased air flow is felt while checking the bypass of the regulator?
Stop using the SCBA and check for proper engagement of the regulator
What action should be taken if pressure falls below 200 psi during doffing of the SCBA?
Stop doffing and bleed SCBA down completely
What should be done before disconnecting waist belt, releasing chest strap, and pushing shoulder strap tabs away from the body during doffing of the SCBA?
Fully close the cylinder valve
What is indicated by four green illuminated LEDs on HUD Pressure Status?
$75-100%$ pressure range
What does a red flashing LED on HUD Alarm Status indicate?
PASS Manual Alarm
What does a buddy light that does not illuminate green indicate?
Electronics Failure
What does a yellow illuminated buddy light indicate at Segment 3 of the pressure range?
Time remaining calculation activated
What action should be taken if the battery icon displays two yellow segments on the secondary screen of the control module?
Do not use the SCBA
What does the flashing red alarm button on the control module indicate according to emergency procedures?
Low pressure alarm
What does the Emergency Breathing Support System (EBSS) contain?
Quick-connect fittings
What is the main purpose of the universal air connection (UAC) fitting?
For emergency filling operations by a rapid intervention team (RIT)
What is the immediate action required if air leaks from any fitting or along the quick fill hose during UAC filling procedure?
Disconnect and reconnect
What should be done after connecting the quick fill hose to the UAC fitting during UAC filling procedure?
Turn on the air supply
What is the primary function of pressing either RESET button (green) on the control module?
Activates the backlight and refreshes the HUD
What temperature range does a yellow background color indicate on the primary screen of the control module?
Between 36-49%
Which action activates the time remaining calculation on the secondary screen of the control module?
Pressing either RESET button once
What does a flashing red pressure LED on HUD, control module, or low pressure alarm indicate?
Low pressure alarm
When should one member hold both manifold blocks during EBSS connection procedure?
Upon reaching a safe, non-toxic atmosphere
What should you do if the LED display lights on the HUD do not show four green lights when using the SCBA?
Investigate the issue further and address it before use
What should be done if the pressure gauge and LCD display show the system pressure is below 4050 psi when using the SCBA?
Change the cylinder immediately
What should be done if there is any visible damage or if the connection seal on the battery module of the SCBA is missing?
Replace the battery module with a new one
What action should be taken if negative pressure cannot be maintained in the face piece of the SCBA during a visual inspection?
Do not use the SCBA and investigate the cause of pressure loss
What should be done if there are no flashing red LED, alarms, or buddy lights when the system pressure falls below 1575 psi in an SCBA?
Take immediate action to address the low system pressure
What is the appropriate action if the needle and gauge face on the gauge of an SCBA are not clearly visible and if the gauge stem is bent?
Replace or repair the gauge as needed
What is recommended if any roll pins are found to be missing during an inspection of an ExtendAire II Manifold in an SCBA?
Replace missing roll pins with correct ones as soon as possible
What should be done if air free flows from the second stage regulator of an SCBA when disconnected from the face piece?
Check and resolve any issues causing air free flow before further use
What action should be taken if unusual sounds such as whistling, chattering, or popping are heard from the regulator during a breathing test with an SCBA?
Do not use the SCBA and investigate and resolve any issues causing unusual sounds
What is recommended if any cracks or visible damage are found on the displays of an SCBA during a routine check?
Seek immediate replacement or repair of affected displays
What should be done if both reset buttons on an SCBA's control module are pressed until the battery icon appears and then disappears after approximately 10 seconds?
Investigate further if this occurs multiple times during checks
What should be done to ensure the quick connect coupling is fully attached to the cylinder valve adapter?
Push the quick connect coupling onto the cylinder valve adapter until an audible snap is heard.
Under what condition should a cylinder be removed from service during a visual inspection?
Exposure to high heat or flame, neck cracks, cuts in the overwrap, or loose fiber bands peeling from the cylinder.
What is the correct procedure for removing and/or tightening the quick connect nipple?
Remove nipple with 15/16” wrench, inspect o-ring for damage, and torque nipple to 15-ft-lbs using a torque wrench.
What are the limitations of SCBA related to cold weather?
Temperature inside the regulator dropping quickly and an attempt required to place the SCBA in a warm environment to prevent freezing.
What should be done if corrective glasses have temple frames that pass between the sealing surface of the face piece and the user's face?
Use corrective lenses that are fitted inside the face piece with a mounting device available from the manufacturer.
What should be done if hissing or popping sounds are heard when pressurizing the SCBA system?
Test the SCBA with another bottle and if the problem persists, place it out of service.
What action should be taken if moisture in the SCBA freezes and restricts airflow?
Attempt to place the SCBA in a warm environment to prevent freezing.
When should a cylinder be removed from service based on hydrostatic test dates?
If the latest date exceeds five (5) years.
Under what conditions should an SCBA be placed out of service?
If hissing or popping sounds are heard when pressurizing the system, control module displays a “Do Not Use” icon, or primary low pressure warning device fails to alarm.
What actions must be taken when conducting visual inspection of cylinders?
Check all cylinders for manufacture and hydrostatic test dates. If latest date exceeds five (5) years, remove cylinders from service. Tag and send to BEARS.
Study Notes
MSA G1 SCBA Overview
- The MSA G1 SCBA is a breathing apparatus that provides a safe air supply to users in hazardous environments.
SCBA Components and Functions
- The inhalation valve in the face piece allows users to breathe in air.
- The mask-mounted regulator in the SCBA controls the air supply to the user.
- The Heads-Up Display (HUD) shows users their air supply status, warnings, and alarms.
- The SCBA has an additional feature of a Personal Alert Safety System (PASS) device.
Harness and Carrier Assembly
- The lumbar pad provides support and comfort to the user's back.
- The Emergency Breathing Support System (EBSS) manifold allows users to connect and share intermediate air pressure.
Low Pressure Warning and Alarm Systems
- The pressure reducer with primary low pressure warning device alerts users to low air pressure.
- The primary low pressure warning device (bell) in the pressure reducer sounds an alarm if the air pressure falls below a certain level.
- The HUD's 7 LEDs separated on the left and right sides display the air pressure status.
PASS Device and Speaker Module
- The PASS device emits a warning signal if the user is stationary for a certain period.
- The speaker module on the left shoulder strap allows users to hear warnings and alarms.
SCBA Usage and Maintenance
- Users should perform a daily mask check and visual inspection on the SCBA before use.
- If the SCBA fails any portion of the daily mask check and/or visual inspection, it should not be used.
- If the cylinder is not fully pressurized during the harness donning process, the user should re-pressurize the cylinder.
- If the primary low pressure warning device fails to alarm while donning the SCBA face piece, the user should check the device and replace it if necessary.
- If there are air leaks while donning the SCBA harness, the user should check the connections and tighten them as necessary.
HUD Status Indicators
- Four green illuminated LEDs on the HUD indicate a normal air pressure status.
- A red flashing LED on the HUD Alarm Status indicates an emergency situation.
- A yellow illuminated buddy light indicates a low air pressure warning.
Emergency Procedures
- If the battery icon displays two yellow segments on the secondary screen of the control module, the user should replace the battery.
- A flashing red alarm button on the control module indicates an emergency situation.
- If the air leaks from any fitting or along the quick fill hose during the UAC filling procedure, the user should stop the procedure and repair the leak.
Universal Air Connection (UAC) Fitting
- The UAC fitting is used to connect the SCBA to an air supply.
- The main purpose of the UAC fitting is to allow users to fill their cylinders quickly.
EBSS Connection Procedure
- The EBSS manifold allows users to connect and share intermediate air pressure.
- Users should hold both manifold blocks during the EBSS connection procedure.
Troubleshooting and Maintenance
- If the LED display lights on the HUD do not show four green lights, the user should check the HUD and replace it if necessary.
- If the pressure gauge and LCD display show the system pressure is below 4050 psi, the user should re-pressurize the cylinder.
- If there is any visible damage or if the connection seal on the battery module is missing, the user should replace the battery module.
- If negative pressure cannot be maintained in the face piece during a visual inspection, the user should replace the face piece.
Cold Weather Limitations
- The SCBA has limitations in cold weather, and users should take precautions to ensure the system functions properly.
Visual Inspection and Maintenance
- Users should perform a visual inspection on the SCBA before use and check for any damage or wear.
- If any cracks or visible damage are found on the displays during a routine check, the user should replace the displays.
- If any roll pins are found to be missing during an inspection of the ExtendAire II Manifold, the user should replace the roll pins.
- If air free flows from the second stage regulator when disconnected from the face piece, the user should replace the regulator.
- If unusual sounds such as whistling, chattering, or popping are heard from the regulator during a breathing test, the user should replace the regulator.
Cylinder Maintenance and Inspection
- Users should inspect cylinders regularly and remove them from service if they are damaged or beyond their hydrostatic test dates.
- Cylinders should be removed from service if they are damaged or show signs of wear.
- Users should ensure the quick connect coupling is fully attached to the cylinder valve adapter.
- The correct procedure for removing and/or tightening the quick connect nipple should be followed.
Corrective Glasses and Face Piece
- If corrective glasses have temple frames that pass between the sealing surface of the face piece and the user's face, the user should adjust the face piece or use alternative glasses.
Moisture and Freezing
- If moisture in the SCBA freezes and restricts airflow, the user should warm the system to thaw the moisture.
- If hissing or popping sounds are heard when pressurizing the SCBA system, the user should check for air leaks and repair them as necessary.
Test your knowledge about the daily inspection and use of Self-Contained Breathing Apparatus (SCBA) with this quiz. The quiz covers topics such as visual inspections, functional tests, and proper donning of the SCBA harness.
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