SCBA MANUAL

Question 1

RESPIRATORY PROTECTION FOR THE MODERN FIREFIGHTER
Firefighters should not enter atmospheres with temperatures exceeding 120 degrees Fahrenheit without protective clothing and FULL respiratory protection.

Answer 1

RESPIRATORY PROTECTION FOR THE MODERN FIREFIGHTER
Firefighters should not enter atmospheres with temperatures exceeding 120 degrees Fahrenheit without protective clothing and FULL respiratory protection.

Question 2

A. CARBON MONOXIDE
Carbon monoxide, a colorless, odorless, flammable gas, is slightly lighter than air. Carbon monoxide is present with every fire and is the most abundantly produced fire gas.

Answer 2

A. CARBON MONOXIDE
Carbon monoxide, a colorless, odorless, flammable gas, is slightly lighter than air. Carbon monoxide is present with every fire and is the most abundantly produced fire gas.

Question 3

. At concentrations of 3,200 parts per million (ppm), or .32 percent, carbon monoxide is an extremely lethal gas, causing unconsciousness after a thirty-minute exposure. When the concentration rises to 12,800 ppm (1.28 percent), unconsciousness occurs immediately upon exposure, with death following in one to three minutes.

Answer 3

. At concentrations of 3,200 parts per million (ppm), or .32 percent, carbon monoxide is an extremely lethal gas, causing unconsciousness after a thirty-minute exposure. When the concentration rises to 12,800 ppm (1.28 percent), unconsciousness occurs immediately upon exposure, with death following in one to three minutes.

Question 4

The normal concentration of carbon dioxide in the atmosphere is 300 ppm (.03 percent). When carbon dioxide at 5,000 ppm (.5 percent) concentration is breathed in, there is a marked increase in respiration, along with dizziness, sweating and mental excitement. Concentrations of 100,000 to 200,000 ppm (10 to 20 percent) may cause death within a few minutes due to paralysis of the respiratory center in the brain.

Answer 4

The normal concentration of carbon dioxide in the atmosphere is 300 ppm (.03 percent). When carbon dioxide at 5,000 ppm (.5 percent) concentration is breathed in, there is a marked increase in respiration, along with dizziness, sweating and mental excitement. Concentrations of 100,000 to 200,000 ppm (10 to 20 percent) may cause death within a few minutes due to paralysis of the respiratory center in the brain.

Question 5

myeloma, lung, larynx and prostate cancer.
4. OXYGEN DEFICIENT ATMOSPHERE
Normal-fresh air exists at 20.9% oxygen concentration in the atmosphere. Acceptable low oxygen as defined by OSHA exists between 20.9% -19.5%. OSHA CFR 1910.134 defines an oxygen deficient atmosphere as one with an oxygen concentration of less than 19.5%.

Answer 5

myeloma, lung, larynx and prostate cancer.
4. OXYGEN DEFICIENT ATMOSPHERE
Normal-fresh air exists at 20.9% oxygen concentration in the atmosphere. Acceptable low oxygen as defined by OSHA exists between 20.9% -19.5%. OSHA CFR 1910.134 defines an oxygen deficient atmosphere as one with an oxygen concentration of less than 19.5%.

Question 6

GENERAL SPECIFICATIONS OF THE 3M SCOTT AIR-PAK [AP] 75 5.5

Answer 6

GENERAL SPECIFICATIONS OF THE 3M SCOTT AIR-PAK [AP] 75 5.5

Question 7

U.S. Department of Transportation (D.O.T.) regulations require that a hydrostatic test is performed on composite cylinders every five (5) years by a certified testing facility. The life span of a composite cylinder is fifteen (15) years from date of manufacture.

Answer 7

U.S. Department of Transportation (D.O.T.) regulations require that a hydrostatic test is performed on composite cylinders every five (5) years by a certified testing facility. The life span of a composite cylinder is fifteen (15) years from date of manufacture.

Question 8

According to the manufacturer, the weight of a charged carbon fiber-wrapped cylinder is 14 lbs. When installed in the NFPA 1981, 2013 edition compliant 3M Scott AP 75 5.5 Air-Pak assembly, the weight is 30 lbs.

Answer 8

According to the manufacturer, the weight of a charged carbon fiber-wrapped cylinder is 14 lbs. When installed in the NFPA 1981, 2013 edition compliant 3M Scott AP 75 5.5 Air-Pak assembly, the weight is 30 lbs.

Question 9

A 45-minute rated composite cylinder contains 66 cubic feet of air pressurized to 5500psi.

Answer 9

A 45-minute rated composite cylinder contains 66 cubic feet of air pressurized to 5500psi.

Question 10

The identification for the harness is found on a metal identification tag attached to the top of the back-frame and on a sticker on the bottom of the breathing regulator.

Answer 10

The identification for the harness is found on a metal identification tag attached to the top of the back-frame and on a sticker on the bottom of the breathing regulator.

Question 11

When the air pressure remaining in the cylinder falls to 33% of the full pressure (1800psi) or the primary pressure reducing circuit fails in the closed position, a transfer valve opens allowing the secondary pressure reducing circuit to function.

Answer 11

When the air pressure remaining in the cylinder falls to 33% of the full pressure (1800psi) or the primary pressure reducing circuit fails in the closed position, a transfer valve opens allowing the secondary pressure reducing circuit to function.

Question 12

The outlet manifold of the pressure reducer assembly is the attachment point for the low-pressure hose, and also contains a resettable over pressure relief valve set at 225 psi.

Answer 12

The outlet manifold of the pressure reducer assembly is the attachment point for the low-pressure hose, and also contains a resettable over pressure relief valve set at 225 psi.

Question 13

Vibralert alarm is an audible and tactile End of Service Time Indicator (EOSTI) that warns the user that less than 33% of the full pressure (1800 psi) remains in the air supply cylinder.

Answer 13

Vibralert alarm is an audible and tactile End of Service Time Indicator (EOSTI) that warns the user that less than 33% of the full pressure (1800 psi) remains in the air supply cylinder.

Question 14

With the facepiece properly sealed to the face, the breathing regulator produces a pressure of approximately .036 to .054 psi above atmospheric pressure inside the facepiece.

Answer 14

With the facepiece properly sealed to the face, the breathing regulator produces a pressure of approximately .036 to .054 psi above atmospheric pressure inside the facepiece.

Question 15

SPRAY BAR

The regulator is equipped with a spray bar, comprised of 9 holes in the upper part of the regulator assembly.

Answer 15

SPRAY BAR

The regulator is equipped with a spray bar, comprised of 9 holes in the upper part of the regulator assembly.

Question 16

A constant flow of at least 4.4 cubic feet per minute (125 liters per minute), can be obtained by rotating the knob one half turn counterclockwise.

Answer 16

A constant flow of at least 4.4 cubic feet per minute (125 liters per minute), can be obtained by rotating the knob one half turn counterclockwise.

Question 17

VIBRALERT ALARM - (END OF SERVICE TIME INDICATOR)

The Vibralert Alarm is an audible and tactile warning device that signals the user by noise and vibration that:

Answer 17

VIBRALERT ALARM - (END OF SERVICE TIME INDICATOR)

The Vibralert Alarm is an audible and tactile warning device that signals the user by noise and vibration that:

Question 18

➢ The air supply remaining in the cylinder is less than 33 percent of the rated capacity of the cylinder. (1800 psi)
and / or
➢ The primary reducing circuit has failed closed, and the secondary pressure reducing circuit is now in operation.
and / or
➢ The primary reducing circuit has failed open, and air at more than 225 psi has entered the outlet manifold. In this case, the relief valve on the outlet manifold will open and there will

Answer 18

➢ The air supply remaining in the cylinder is less than 33 percent of the rated capacity of the cylinder. (1800 psi)
and / or
➢ The primary reducing circuit has failed closed, and the secondary pressure reducing circuit is now in operation.
and / or
➢ The primary reducing circuit has failed open, and air at more than 225 psi has entered the outlet manifold. In this case, the relief valve on the outlet manifold will open and there will

Question 19

RADIO FREQUENCY INTERFERENCE
To avoid radio frequency interference members shall keep antennas of hand-held radios at least six (6) inches away from the Control Console with Remote Pressure Gauge, and the Sensor Module of the Pak-Alert distress alarm.

Answer 19

RADIO FREQUENCY INTERFERENCE
To avoid radio frequency interference members shall keep antennas of hand-held radios at least six (6) inches away from the Control Console with Remote Pressure Gauge, and the Sensor Module of the Pak-Alert distress alarm.

Question 20

If the motion sensor does not sense motion of the SCBA for 20 seconds, the Pak-Alert will signal a prealarm condition. If there is still no motion of the SCBA in the next 12 seconds, the full alarm will sound.
SCBA to remain motionless for 32 seconds

Answer 20

If the motion sensor does not sense motion of the SCBA for 20 seconds, the Pak-Alert will signal a prealarm condition. If there is still no motion of the SCBA in the next 12 seconds, the full alarm will sound.
SCBA to remain motionless for 32 seconds

Question 21

. With fresh alkaline batteries, the Pak-Alert will last in full alarm (red flashing light) for about 8 hours.

Answer 21

. With fresh alkaline batteries, the Pak-Alert will last in full alarm (red flashing light) for about 8 hours.

Question 22

. To transmit on a portable radio when wearing the 3M Scott Vision C5 facepieces, place the radio microphone about ½” away from, and in line with a speaking diaphragm, and speak normally.

Answer 22

. To transmit on a portable radio when wearing the 3M Scott Vision C5 facepieces, place the radio microphone about ½” away from, and in line with a speaking diaphragm, and speak normally.

Question 23

e Pak-Tracker Locator System is a two-part electronic system consisting of a radio transmitter integrated into the Scott Pak-Alert distress alarm and a directional receiver (Hand-Held Receiver or HHR) that is used to locate signals coming from the transmitter.

Answer 23

e Pak-Tracker Locator System is a two-part electronic system consisting of a radio transmitter integrated into the Scott Pak-Alert distress alarm and a directional receiver (Hand-Held Receiver or HHR) that is used to locate signals coming from the transmitter.

Question 24

The Pak-Tracker HHR can detect a signal up to nine hundred feet (900’) in a straight line of sight and has the capability of penetrating through thick smoke in a structural fire. Not only is this system very effective in structural firefighting but can also be a valuable tool to use in search and rescue operations.

Answer 24

The Pak-Tracker HHR can detect a signal up to nine hundred feet (900’) in a straight line of sight and has the capability of penetrating through thick smoke in a structural fire. Not only is this system very effective in structural firefighting but can also be a valuable tool to use in search and rescue operations.

Question 25

Each Pak-Tracker Locator Transmitter has been programmed to transmit a code that enables search teams to identify up to thirty-six (36) locator transmitters simultaneously in alarm mode.

Answer 25

Each Pak-Tracker Locator Transmitter has been programmed to transmit a code that enables search teams to identify up to thirty-six (36) locator transmitters simultaneously in alarm mode.

Question 26

PAK-TRACKER HANDHELD RECEIVER - LOW BATTERY CONDITION & BATTERY REPLACEMENT The Handheld Receiver is powered and operates on one rechargeable NiMH battery. In nontracking mode, the batteries will last approximately 12 hours. In tracking mode, the batteries will last approximately 6 hours.

Answer 26

PAK-TRACKER HANDHELD RECEIVER - LOW BATTERY CONDITION & BATTERY REPLACEMENT The Handheld Receiver is powered and operates on one rechargeable NiMH battery. In nontracking mode, the batteries will last approximately 12 hours. In tracking mode, the batteries will last approximately 6 hours.

Question 27

When the battery in the Handheld Receiver has approximately twenty percent (20%) of its life remaining, the “Low Batt” indicator light on the display panel will glow yellow. The Handheld Receiver will continue to operate for approximately forty-five (45) minutes in the low battery condition.

Answer 27

When the battery in the Handheld Receiver has approximately twenty percent (20%) of its life remaining, the “Low Batt” indicator light on the display panel will glow yellow. The Handheld Receiver will continue to operate for approximately forty-five (45) minutes in the low battery condition.

Question 28

PAK-TRACKER INDICATORS AND ALARMS When activated, the Pak-Tracker HHR displays a visual and audible signal to guide a searcher to the location of the downed firefighter. The large LCD panel on the Pak-Tracker HHR will visually display up to two active transmissions at a time. While in alarm mode the operator has the capability of scrolling through up to thirty-six (36) transmitters.

Answer 28

PAK-TRACKER INDICATORS AND ALARMS When activated, the Pak-Tracker HHR displays a visual and audible signal to guide a searcher to the location of the downed firefighter. The large LCD panel on the Pak-Tracker HHR will visually display up to two active transmissions at a time. While in alarm mode the operator has the capability of scrolling through up to thirty-six (36) transmitters.

Question 29

The high intensity graphical bars incrementally illuminate when signal strength is greater than 50%. A continuous audible tone will increase in volume as the search nears the down firefighter.

Answer 29

The high intensity graphical bars incrementally illuminate when signal strength is greater than 50%. A continuous audible tone will increase in volume as the search nears the down firefighter.

Question 30

➢ Transmitter signals will usually pass through the following type of materials or openings: * Openings such as gaps, holes, stairways, windows, or elevator shafts * Glass * Wood * Light building materials

Answer 30

➢ Transmitter signals will usually pass through the following type of materials or openings: * Openings such as gaps, holes, stairways, windows, or elevator shafts * Glass * Wood * Light building materials

Question 31

➢ Transmitter signals will reflect off the following types of materials: ``` • Metal, including structural framework • Large metal objects • Concrete walls or floors • Brick or concrete block construction ➢ The transmitter signal will be absorbed by the human body. ```

Answer 31

➢ Transmitter signals will reflect off the following types of materials: ``` • Metal, including structural framework • Large metal objects • Concrete walls or floors • Brick or concrete block construction ➢ The transmitter signal will be absorbed by the human body. ```

Question 32

Inspection and Testing of the 3M Scott AP 75 5.5 SCBA

Answer 32

Inspection and Testing of the 3M Scott AP 75 5.5 SCBA

Question 33

A. A “full” cylinder is indicated by the pressure gauge indicator being just to the left of “F” in FULL. However, cylinders shall be changed when the pressure gauge indicator falls below 5000psi.

Answer 33

A. A “full” cylinder is indicated by the pressure gauge indicator being just to the left of “F” in FULL. However, cylinders shall be changed when the pressure gauge indicator falls below 5000psi.

Question 34

A. Damage to composite cylinders is assessed on three levels. Level 1. Cuts or scratches involving the outer surfaces only. Level 2. Cuts that have penetrated through outer layers of plastic and have cut the fiber over-wrap threads. Level 3. Cuts greater than Level 2 or cuts that exposed bare metal.

Answer 34

A. Damage to composite cylinders is assessed on three levels. Level 1. Cuts or scratches involving the outer surfaces only. Level 2. Cuts that have penetrated through outer layers of plastic and have cut the fiber over-wrap threads. Level 3. Cuts greater than Level 2 or cuts that exposed bare metal.

Question 35

Cylinders with damage greater than Level 1 shall be placed out of service.

Answer 35

Cylinders with damage greater than Level 1 shall be placed out of service.

Question 36

The most definitive solution to any air emergency is to exit the IDLH atmosphere.

Answer 36

The most definitive solution to any air emergency is to exit the IDLH atmosphere.

Question 37

Upon making contact with a downed or disoriented firefighter, the rescuing crew must control the PASS device if activated, declare a Mayday, and perform a rapid assessment of the downed firefighter’s SCBA. The ABC’S acronym may be used to perform an organized assessment:

Answer 37

Upon making contact with a downed or disoriented firefighter, the rescuing crew must control the PASS device if activated, declare a Mayday, and perform a rapid assessment of the downed firefighter’s SCBA. The ABC’S acronym may be used to perform an organized assessment:

Question 38

Airway – Check the integrity of the facepiece to ensure that the lens, gasket, and interface with the breathing regulator is intact. If any part of the facepiece is not intact, immediately replace the facepiece with a functional one. Breathing – Check to make sure that the breathing regulator is intact and attached to the facepiece by performing a visual inspection. If the regulator is not present, not intact, and/or not attached to the facepiece, immediately replace the breathing regulator with a functional one. Cylinder – Check to make sure that there is air in the SCBA cylinder by looking at either the remote gauge, cylinder gauge, or heads up display. If there is less than 1800psi remaining in the downed firefighter’s cylinder, provide supplemental from a RIT Pak or SCBA.

Answer 38

Airway – Check the integrity of the facepiece to ensure that the lens, gasket, and interface with the breathing regulator is intact. If any part of the facepiece is not intact, immediately replace the facepiece with a functional one. Breathing – Check to make sure that the breathing regulator is intact and attached to the facepiece by performing a visual inspection. If the regulator is not present, not intact, and/or not attached to the facepiece, immediately replace the breathing regulator with a functional one. Cylinder – Check to make sure that there is air in the SCBA cylinder by looking at either the remote gauge, cylinder gauge, or heads up display. If there is less than 1800psi remaining in the downed firefighter’s cylinder, provide supplemental from a RIT Pak or SCBA.

Question 39

RIT PAK OPERATIONS A 1000 denier nylon bag with center pocket to accommodate SCBA cylinder, split side pockets to hold high and low pressure hoses, top pocket to hold webbing and cutters, shoulder strap, (4) shoulder strap connection rings, grab handles, RIC/UAC connection pocket.

Answer 39

RIT PAK OPERATIONS A 1000 denier nylon bag with center pocket to accommodate SCBA cylinder, split side pockets to hold high and low pressure hoses, top pocket to hold webbing and cutters, shoulder strap, (4) shoulder strap connection rings, grab handles, RIC/UAC connection pocket.

Question 40

RIT PAK RESPONSIBILITIES This section will identify the users of the RIT Pak as a two-person team with specific responsibilities. The team shall consist of the “air management firefighter” and the “packaging firefighter.”

Answer 40

RIT PAK RESPONSIBILITIES This section will identify the users of the RIT Pak as a two-person team with specific responsibilities. The team shall consist of the “air management firefighter” and the “packaging firefighter.”

Question 41

The air management firefighter will be the Hook position on the truck unless otherwise directed company and be responsible for carrying the RIT Pak, performing the assessment, and making all air connections.

Answer 41

The air management firefighter will be the Hook position on the truck unless otherwise directed company and be responsible for carrying the RIT Pak, performing the assessment, and making all air connections.

Question 42

The “packaging firefighter” will be the Barman position on the truck responsible for doing all downed firefighter packaging (waist/shoulder straps/webbing) and securing the RIT Pak to the downed firefighter for extrication from the IDLH.

Answer 42

The “packaging firefighter” will be the Barman position on the truck responsible for doing all downed firefighter packaging (waist/shoulder straps/webbing) and securing the RIT Pak to the downed firefighter for extrication from the IDLH.

Question 43

The priority for the team mitigating a firefighter down emergency is to complete an assessment of the firefighter and make a decision on providing air or rapidly packaging the firefighter based on interior conditions. At no time during that process do the responsibilities listed above preclude the air management firefighter from helping with packaging or vice versa.

Answer 43

The priority for the team mitigating a firefighter down emergency is to complete an assessment of the firefighter and make a decision on providing air or rapidly packaging the firefighter based on interior conditions. At no time during that process do the responsibilities listed above preclude the air management firefighter from helping with packaging or vice versa.

Question 44

Dual EBSS to Dual EBSS If a user requires supplemental air to safely self-extricate or be extricated from an IDLH atmosphere, a Dual EBSS to Dual EBSS connection may be utilized. This type of connection allows for the sum of air between the downed firefighter’s cylinder and the RIT cylinder to be consumed.

Answer 44

Dual EBSS to Dual EBSS If a user requires supplemental air to safely self-extricate or be extricated from an IDLH atmosphere, a Dual EBSS to Dual EBSS connection may be utilized. This type of connection allows for the sum of air between the downed firefighter’s cylinder and the RIT cylinder to be consumed.

Question 45

The air in the cylinder with the lowest pressure is consumed first. While the downed firefighter is breathing off of their cylinder the Vibralert function is operational. When the RIT Pak is supplying the downed firefighter, the whistle is the only indication of a low RIT Pak cylinder.

Answer 45

The air in the cylinder with the lowest pressure is consumed first. While the downed firefighter is breathing off of their cylinder the Vibralert function is operational. When the RIT Pak is supplying the downed firefighter, the whistle is the only indication of a low RIT Pak cylinder.

Question 46

Pros: • Sum of both cylinders available for consumption • Does not increase risk of pulling facepiece from downed firefighter’s face • No interruption in air supply

Answer 46

Pros: • Sum of both cylinders available for consumption • Does not increase risk of pulling facepiece from downed firefighter’s face • No interruption in air supply

Question 47

``` TRANSFILLING CYLINDERS (RIC / UAC) The RIC/UAC connection and hose allows the pressure in two cylinders to be equalized under high pressure. The speed and volume of compressed air being trans filled depends on the difference in pressure between the supply cylinder and the cylinder needing air. A completely full (5500psi) cylinder supplying a completely empty cylinder takes approximately 45 seconds to trans fill and will equalize at approximately 2250psi (some pressure is lost to pressurizing the system, heat transfer from filling and from Vibralert activation.) ```

Answer 47

``` TRANSFILLING CYLINDERS (RIC / UAC) The RIC/UAC connection and hose allows the pressure in two cylinders to be equalized under high pressure. The speed and volume of compressed air being trans filled depends on the difference in pressure between the supply cylinder and the cylinder needing air. A completely full (5500psi) cylinder supplying a completely empty cylinder takes approximately 45 seconds to trans fill and will equalize at approximately 2250psi (some pressure is lost to pressurizing the system, heat transfer from filling and from Vibralert activation.) ```

Question 48

. Although possible, transfilling cylinders when the low-air whistle has been activated on the RIT cylinder (indicating <25% cylinder pressure remaining) will not return an adequate pressure or volume of air worth waiting for the trans fill process to complete. As an alternative, utilizing the EBSS would allow the sum of both cylinders’ volume to be consumed and would be available immediately so long as the connection could be maintained during egress.

Answer 48

. Although possible, transfilling cylinders when the low-air whistle has been activated on the RIT cylinder (indicating <25% cylinder pressure remaining) will not return an adequate pressure or volume of air worth waiting for the trans fill process to complete. As an alternative, utilizing the EBSS would allow the sum of both cylinders’ volume to be consumed and would be available immediately so long as the connection could be maintained during egress.

Question 49

BUDDY BREATHING OPERATIONS When a low air emergency occurs, the most readily available resource for air is the crew and/or partner of the firefighter needing air. The crew or partner may be able to provide air via Buddy Breathing quicker than requesting a RIT Pak and may also eliminate the need for declaring a MAYDAY.

Answer 49

BUDDY BREATHING OPERATIONS When a low air emergency occurs, the most readily available resource for air is the crew and/or partner of the firefighter needing air. The crew or partner may be able to provide air via Buddy Breathing quicker than requesting a RIT Pak and may also eliminate the need for declaring a MAYDAY.

Question 50

Dual EBSS to Dual EBSS When a user requiring air (Vibralert activated) is supplied from another SCBA via the Dual EBSS to Dual EBBS method, both users’ Vibralerts will activate. An automatic switch in the pressure reducer allows both users to deplete the lowest cylinder first.

Answer 50

Dual EBSS to Dual EBSS When a user requiring air (Vibralert activated) is supplied from another SCBA via the Dual EBSS to Dual EBBS method, both users’ Vibralerts will activate. An automatic switch in the pressure reducer allows both users to deplete the lowest cylinder first.

Question 51

Once the air pressure in the low cylinder has been depleted (less than 500 PSI), both users will automatically be switched to the air supply of the higher cylinder. Both Vibralerts will turn off if this SCBA is above 1/3 full

Answer 51

Once the air pressure in the low cylinder has been depleted (less than 500 PSI), both users will automatically be switched to the air supply of the higher cylinder. Both Vibralerts will turn off if this SCBA is above 1/3 full

Question 52

FAILURES OF THE PRIMARY REDUCING CIRCUIT | PRIMARY REDUCING CIRCUIT FAILED CLOSED

Answer 52

FAILURES OF THE PRIMARY REDUCING CIRCUIT | PRIMARY REDUCING CIRCUIT FAILED CLOSED

Question 53

Under normal operating conditions, when the cylinder is depleted to 1/3 full, the Primary Reducing Circuit closes, and the Secondary Reducing Circuit opens. The Secondary Reducing Circuit supplies the low-pressure hose to the Mask Mounted Regulator with 150 PSI; the extra 50 PSI operates the Vibralert in the regulator.

Answer 53

Under normal operating conditions, when the cylinder is depleted to 1/3 full, the Primary Reducing Circuit closes, and the Secondary Reducing Circuit opens. The Secondary Reducing Circuit supplies the low-pressure hose to the Mask Mounted Regulator with 150 PSI; the extra 50 PSI operates the Vibralert in the regulator.

Question 54

Indications: • Vibralert alarm activation AND • Remaining SCBA cylinder pressure above 33% (or >1800psi.)

Answer 54

Indications: • Vibralert alarm activation AND • Remaining SCBA cylinder pressure above 33% (or >1800psi.)

Question 55

PRIMARY REDUCING CIRCUIT FAILED OPEN Explanation: When the pressure within the cylinder reaches 33% (~1800 psi,) the primary circuit is supposed to close to send air to the secondary circuit. In a primary circuit failure in the open position, the primary circuit fails to close, and air is flowing through both circuits.

Answer 55

PRIMARY REDUCING CIRCUIT FAILED OPEN Explanation: When the pressure within the cylinder reaches 33% (~1800 psi,) the primary circuit is supposed to close to send air to the secondary circuit. In a primary circuit failure in the open position, the primary circuit fails to close, and air is flowing through both circuits.

Question 56

Actions: • Fully open the red purge valve knob on the regulator by turning it counterclockwise (pointer on knob downward). • Partially close the cylinder valve by pushing in and rotating clockwise to regulate the flow of air to satisfy the requirements of the user. Do not close the cylinder valve completely.

Answer 56

Actions: • Fully open the red purge valve knob on the regulator by turning it counterclockwise (pointer on knob downward). • Partially close the cylinder valve by pushing in and rotating clockwise to regulate the flow of air to satisfy the requirements of the user. Do not close the cylinder valve completely.

Question 57

FAILURES OF THE BREATHING REGULATOR BREATHING REGULATOR FAILED CLOSED Explanation: Sudden loss of air supply to the facepiece can be a result of mechanical failure of the regulator mechanism, inadvertently closing the cylinder valve, or “overbreathing the regulator” due to only partially opened cylinder valve.

Answer 57

FAILURES OF THE BREATHING REGULATOR BREATHING REGULATOR FAILED CLOSED Explanation: Sudden loss of air supply to the facepiece can be a result of mechanical failure of the regulator mechanism, inadvertently closing the cylinder valve, or “overbreathing the regulator” due to only partially opened cylinder valve.

Question 58

Indications: • Mask draws in and collapses to the user’s face with minimal or no air flow Actions: • Fully open the red purge valve knob on the regulator by turning it counterclockwise (pointer on knob downward). • Simultaneously verify that the cylinder valve is fully open.

Answer 58

Indications: • Mask draws in and collapses to the user’s face with minimal or no air flow Actions: • Fully open the red purge valve knob on the regulator by turning it counterclockwise (pointer on knob downward). • Simultaneously verify that the cylinder valve is fully open.

Question 59

In the case of failures caused by over-breathing the regulator: • Ensure the cylinder valve is fully opened – This is the only condition within this section that is user-correctable and does not require the user to exit if the condition is identified and corrected.

Answer 59

In the case of failures caused by over-breathing the regulator: • Ensure the cylinder valve is fully opened – This is the only condition within this section that is user-correctable and does not require the user to exit if the condition is identified and corrected.

Question 60

The mnemonic for a sudden loss of air supply to the facepiece is “high, low, and away.” High refers to the left hand going high to the purge valve, low refers to the right hand going low to the cylinder valve, and away refers to both valves being turned away from the wearer.

Answer 60

The mnemonic for a sudden loss of air supply to the facepiece is “high, low, and away.” High refers to the left hand going high to the purge valve, low refers to the right hand going low to the cylinder valve, and away refers to both valves being turned away from the wearer.

Question 61

AIR UNIT STANDARD OPERATING PROCEDURES & GUIDELINES It should be noted Air-1 and Air-2, and all related issues pertaining to the units come under the operational control of the Captain(s) of Engine Company 4 and Engine Company 8, respectively.

Answer 61

AIR UNIT STANDARD OPERATING PROCEDURES & GUIDELINES It should be noted Air-1 and Air-2, and all related issues pertaining to the units come under the operational control of the Captain(s) of Engine Company 4 and Engine Company 8, respectively.

Question 62

The Department maintains five (5) air compressors. Four are located at fixed facilities, Engine Co. 4, Engine Co. 8, the Fire Training Academy and Adams Place Warehouse. The fifth is mobile and is carried on Mobile Air Unit.

Answer 62

The Department maintains five (5) air compressors. Four are located at fixed facilities, Engine Co. 4, Engine Co. 8, the Fire Training Academy and Adams Place Warehouse. The fifth is mobile and is carried on Mobile Air Unit.