SCBA (Passage 6) Flashcards
1
Q
Of what is the back frame and harness assembly of the SCBA constructed?
A
A solid, one piece, black, aluminum alloy frame.
2
Q
Of what does the SCBA harness consist?
A
Adjustable shoulder and waist straps.
3
Q
Of what are the adjustable shoulder and waist straps made?
A
Heavy braided webbing
4
Q
What joins all the assemblies of SCBA together?
A
The back frame
5
Q
How are all the assemblies of SCBA connected?
A
They are welded.
6
Q
How is the air cylinder secured to the back frame? (2)
A
A Kevlar fabric band and a double locking latch.
7
Q
What air cylinders can be secured by the Kevlar strap?
A
Air cylinders of 30, 45, or 60 minutes.
8
Q
With the 2 shoulder straps, through what must the excess slack be pulled?
A
The 2 alligator clips.
9
Q
What will prevent fatigue with regard to SCBA?
A
Carrying the weight of the SCBA on the waist and not the shoulders.
10
Q
What is located at the bottom of the back frame of the SCBA? (2)
A
- Pressure reducer and
2. Cylinder housing block
11
Q
What will you find at the cylinder housing block? (2)
A
- Universal Air Connector (UAC)
2. Rapid Intervention Crew (RIC) connection
12
Q
What does UAC stand for?
A
Universal Air Connector
13
Q
What is located just right of the pressure reducer?
A
A pouch which holds the dual Emergency Breathing Support System (EBSS) buddy breathing hose.
14
Q
What does EBSS stand for?
A
Emergency Breathing Support System
15
Q
What is located above the pressure reducer? (2)
A
- The electronics module with mounted LEDs and sounders
2. A sleeve which contains the batteries for the SCBA
16
Q
To what is the regulator attached?
A
To a low pressure hose
17
Q
Where is the low pressure hose located?
A
It comes over the left shoulder when the SCBA is donned.
18
Q
Where is the regulator keeper located?
A
On the left waist strap.
19
Q
What is located on the left shoulder of the SCBA?
A
The low pressure hose.
20
Q
What is located on the left waist strap of the SCBA?
A
The regulator keeper.
21
Q
Where is the remote pressure gauge located?
A
Over the right shoulder, which allows the user to see how much air is left in the cylinder.
22
Q
What is located on the right shoulder of the SCBA?
A
The remote pressure gauge.
23
Q
Of what are cylinders constructed?
A
A lightweight, composite material made of an aluminum alloy inner shell, over wrapped with carbon fiber, fiberglass and epoxy resin.
24
Q
What is the quick-connect fitting called for the cylinder to snap into the SCBA that allows for a quick and efficient bottle exchange?
A
Hansen valve
25
What is the Hansen valve?
The quick-connect fitting for the air cylinder to snap into the SCBA.
26
What do the air bottles have for recharging?
A straight Compressed Gas Association (CGA) male threaded inlet.
27
What does CGA stand for?
Compressed Gas Association
28
What is significant about the 60-minute RIC bottles and some isolated air-tool bottles?
They do not have a quick-connect Hansen valve and are connected only through the CGA inlet.
29
What does the cylinder valve contain?
A dual-reading primary pressure gauge.
30
What can happen if the cylinder valve is not fully open?
It may induce outlet freezing and prevent air from being provided to the user.
31
How must the cylinder be closed?
The valve wheel must be simultaneously pushed in and rotated clockwise.
32
What pressure can the cylinder withstand prior to failure?
Approximately 13,500 psi or 3 times the working pressure of 4,500 psi
33
What is located within the cylinder valve assembly?
A frangible disc.
34
What is the purpose of the frangible disc?
It is a safety device and intended to burst and allow gas to escape to prevent rupture of the cylinder
35
To what is the frangible disc similar and how is it different to that?
It is similar in function to a safety relief valve, however, it has no reset capability.
36
At what pressure is the frangible disc set to burst?
At 7,500 psi or 5/3 the working pressure of the cylinder.
37
Where is the pressure reducer assembly located?
On the bottom of the back frame connected to the cylinder housing block, where the air cylinder is connected.
38
What is the definition of the pressure reducer assembly?
It is a redundant dual path reducing system broken down into the primary and secondary reducer.
39
During normal operation, what is the path of air from the cylinder?
From the cylinder and valve assembly through the primary reducer to the regulator.
40
From what to what is the pressure from the cylinder reduced through the primary reducer?
From 4,500 psi to 85-110 psi.
41
What happens if the primary reducer fails or becomes blocked?
The air supply automatically flows through the secondary reducer to the regulator via the automatic transfer valve.
42
What does the automatic transfer valve do?
Should the primary reducer fails or becomes blocked, the automatic transfer valve reroutes air to the regulator through the secondary reducer.
43
What happens when the secondary reducer becomes active?
The Vibralert activates to alert the user the primary reducer has malfunctioned.
44
From what to what is the pressure from the cylinder reduced through the secondary reducer?
From 4,500 psi to 145-175 psi.
45
With what is the pressure reducer also equipped?
A low cylinder transfer valve (which activates the Vibralert when the cylinder pressure reaches 25%, approximately 1,100 psi)
46
When does the low cylinder transfer valve activate the Vibralert?
When the cylinder pressure reaches 25%, approximately 1,100 psi.
47
Where is the remote pressure gauge located and to what is it attached? (2)
On the right shoulder harness and is attached to the pressure reducer and the electronics module.
48
What type of gauge is the remote pressure gauge and, generally, what does it show?
It is a mechanical gauge with a glow in the dark backing that indicates to the user how much air is remaining in the system.
49
The remote pressure gauge must be within how many psi of the primary cylinder gauge?
250 psi
50
What number readings does the remote pressure gauge have on it?
10, 20, 30, 45
51
What colors are on the remote pressure gauge?
The first 25% of the gauge is marked in red and the top 25% is marked green denoting full.
52
How many buttons are on the remote pressure gauge and what colors are they and what are they for?
2 buttons.
RED manual alarm button
YELLOW reset button
53
What does the red button on the remote pressure gauge do?
It triggers the manual alarm to sound even if the SCBA is not in use.
54
What does the yellow button do? (2)
1. It is used to reset the SCBA during pre-alarm or full alarm with just 2 presses.
2. Holding the yellow button also performs a battery check.
55
How do you perform a battery check for your SCBA?
Press and hold the yellow button on the remote pressure gauge until you get a color showing on the remote pressure gauge and the Back Frame LEDs.
Red denotes batteries need to be changed.
Green shows batteries are in good working condition.
56
Generally, what does the Pak-Alert sensor module do?
It alerts of a downed fire fighter utilizing audible and visual indicators.
57
How many visual and audible alarms does the Pak-Alert sensor module have and where are they located?
There are DUAL visual and audible alarms. The sensor module is located on the back frame and harness assembly and on the user's right shoulder strap in the remote pressure gauge.
58
What powers the Pak-Alert sensor module and where are they located?
3 "C" cell batteries in the sleeve located on the back frame.
59
How is the Pak-Alert sensor module turned on and how do you know?
```
The sensor module automatically turns on when the air cylinder is charged.
This will be indicated by a green flashing LED light on the sensor module and with an activation chirp.
```
60
How long must the user remain motionless for the Pak-Alert sensor module to go into pre-alarm?
20 seconds
61
What happens when the Pak-Alert sensor module goes into pre-alarm?
The sensor LED lights will flash RED and a two-toned alert will sound.
62
How many more seconds after pre-alarm does it take the Pak-Alert to go into full alarm?
10-12 seconds
63
What happens when the Pak-Alert sensor module to goes into full alarm?
The sensor module LED lights flash RED and a high frequency three-toned alert will sound.
64
How long does it take for a Pak-Alert sensor module to go from normal mode to full alarm?
30-32 seconds
65
How do you reset a pre-alarm activation? (2)
1. Press the yellow reset button on the remote pressure gauge
2. Use the "hands-free" reset which is activated by a light movement of the SCBA.
66
How do you reset a full alarm activation?
Push the yellow reset button on the remote pressure gauge twice.
67
The mask-mounted regulator is the link between what?
The low pressure hose from the pressure reducer and the face piece.
68
What does the mask-mounted regulator do?
It regulates the air to the face piece and provides several emergency functions.
69
What is the capacity of the mask-mounted regulator during normal operation?
500 liters per minute
70
When does the mask-mounted regulator provide air?
Upon inhalation
71
What are the external parts of the mask-mounted regulator? (3)
1. A purge valve (RED)
2. A donning/doffing switch (BLACK)
3. A Heads-Up Display (HUD)
72
What are the internal parts of the mask-mounted regulator? (3)
1. The Vibralert low air pressure warning device
2. A diaphragm
3. Several other internal regulating components
73
How does the mask-mounted regulator mount to the face piece?
By a spring-loaded latching mechanism.
74
How can the breathing regulator be disconnected from the low pressure hose during emergency use?
With a quick disconnect fitting.
75
What does the purge valve do?
Allows air to bypass the breathing regulator.
76
When should the purge valve be used? (3)
It should be used in situations where the face piece needs to be
a. purged,
b. defogged or
c. in the event of a breathing regulator failure.
77
How do you open and close the purge valve?
Turn the valve knob counterclockwise one-half turn.
| Turn the valve knob clockwise one-half turn.
78
What does the donning switch look like and where is it located?
A black rectangular-shaped button located on top of the breathing regulator assembly.
79
What is the function of the donning switch?
To control air flow to the face piece.
80
How do you stop air flow and resume air flow to the face piece?
Pushing the donning switch downward will stop air flow.
| Air flow resumes when the user inhales sharply.
81
The HUD utilizes LED indicator lights to monitor what? (2)
1. The remaining air supply
| 2. Battery life
82
Where is the HUD located?
Within the breathing regulator
83
When the SCBA is first charged, how long do all lights appear on the HUD?
20 seconds
84
What happens after the HUD lights are illuminated for 20 seconds when the SCBA is first charged?
The lights illuminate to show the proper pressure.
85
HUD display:
| 2 solid green lights
HUD display:
| Full
86
HUD display:
| 1 solid green lights
HUD display:
| 3/4
87
HUD display:
| yellow light flashing slowly
HUD display:
| 1/2
88
HUD display:
| red light flashing rapidly
HUD display:
| 1/4
89
Where is the Vibralert system located?
It is located in the regulator.
90
How does the Vibralert system alert the user?
By causing an audible alarm to sound upon inhalation and simultaneously causing a vibration of the face piece.
91
Under what conditions will the Vibralert operate? (4)
1. Air cylinder pressure falls below 25% of full (1,100 psi)
2. A failure occurs within the primary reducing system
3. Buddy Breathing with a user that has less than 1,100 psi
4. Upon opening the cylinder valve, to indicate the system is activated.
92
Where is the diaphragm located?
Inside the regulator.
93
What does the diaphragm do?
It activates and deactivates air flow.
94
What does orange lettering and a "+" sign on the regulator indicate?
The regulator is Chemical, Biological, Radiation, Nuclear (CBRN) compliant.
95
What does a white sticker on a regulator indicate?
The regulator is not CBRN compliant.
96
At what pressure does the primary pressure reducer provide air to the regulator?
85-110 psi
97
At what pressure does the secondary pressure reducer provide air to the regulator?
145-175 psi
98
What are the 2 primary types of face piece masks used by many Fire departments?
1. The Scott AV2000
| 2. The Scott AV3000
99
What are the parts of a face piece? (5)
1. Nose cup
2. Face piece seal
3. Lens
4. Head harness
5. Straps
100
What is significant of the Scott AV2000 face piece? (4)
1. An older make version
2. No longer in production
3. 3 sizes indicated by a colored face piece seal
4. Nonadjustable
101
What do these colors mean for the Scott AV2000 and AV3000 masks?
Green
Black
Red
```
Green = small
Black = medium
Red = large
```
102
What style of voice-amp adapter does the Scott AV2000 most use?
A clamp-type voice-amp adapter.
103
What are the strap configurations of the Scott AV2000 mask? (2)
1. 4 attachment straps
| 2. Dual seal and 5 straps
104
Why is the 5th strap on one of the Scott AV2000 masks significant?
The 5th (top) strap meets the NFPA requirement for fit while wearing WMD adapter attachments.
105
Why would some individuals continue to use the Scott AV2000 mask if it is older and no longer in production?
For a better fit.
106
How many styles of Scott AV3000 masks are there (Name them) and what is significant about them?
1. 2 styles
a. AV3000
b. AV3000 Sure Seal
2. Highly customizable with various-sized face piece seals and nose cups.
107
Where is the size located on the Scott AV3000 and Scott AV3000 Sure Seal and how are they indicated?
They are located behind the head harness anchors and at the bottom of the seal is a letter and a circular color insert.
108
How many sizes of Scott AV3000 and AV3000 Sure Seal masks are there and how are they indicaed?
3 sizes
Small (Green/S)
Medium (Black/M)
Large (Red/L)
109
For the Scott AV3000 and AV3000 Sure Seal masks, how many styles of nose cups are there and how are they indicated?
2 styles,
| black or gray.
110
What does a black nose cup indicate? (3)
1. It is only for the AV3000
2. Four sizes, (S, M, L, XL)
3. Designed to be placed inside the seal
111
What does a gray nose cup indicate? (4)
1. For both mask styles
2. Three sizes (S, M, L)
3. Designed to be outside the seal
4. Size is indicated by a small letter on the left side of the nose cup.
112
What sizes do the AV3000 head harnesses come and how is the size indicated?
1. 2 sizes,
a. Standard (SD)
b. Large (L)
2. By looking at either of the upper head harness anchors.
113
How many sizes does the AV3000 Sure Seal head harness come?
One universal size.
114
Of what are the head harnesses of both mask styles made?
Kevlar and have flame resistant straps.
115
Of what does the lens on the face piece consist?
A poly carbonate plastic, hard-coated to resist abrasion.
116
What add-on options are available for a face piece? (2)
1. An eyeglass adapter
| 2. A Mask Seal Kit to improve fit
117
To where does a screw-type voice amp adapter mount on the SCBA mask?
On the wearer's right.
118
What is mounted on the SCBA mask on the wearer's right?
A screw-type voice amp adapter.
119
How many sizes are available for:
a. Scott facepiece
b. AV2000 mask
c. AV3000 mask
a. 2
b. 3
c. 3
120
How many sizes are available for:
d. AV3000 nose cup styles
e. AV3000 black nose cups
f. AV3000 gray nose cups
d. 2
e. 4
f. 3
121
How many sizes are available for:
g. AV3000 head harness
h. AV3000 Sure Seal head harness
g. 2
| h. 1
122
Where is the frangible disc located?
Within the cylinder valve assembly.
123
What is the name of the Scott version of the MSA PASS device?
Pak-Alert
124
What is the name of the Scott version of the MSA bypass valve?
Purge valve
125
What is the name of the Scott version of the MSA head net?
Head harness
126
What is the name of the Scott version of the MSA voice amplifier?
Voice-amp adapter
127
What switch controls air flow to the face piece.
Donning switch (black)
128
What valve engages to have air flow change from the primary reducer to the secondary reducer?
Automatic transfer valve
