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SCUBA/UBA > MK 20 UBA > Flashcards

MK 20 UBA Flashcards

1
Q

What are the depth limits of the MK 20?

A

Surface Supplied - 60’

Scuba Mode - 190’

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2
Q

What are the two MK 20 configurations and their differences?

A

MOD 0 - Positive Pressure

MOD 1 - Non- Positive Pressure (mainly for scuba mode to conserve air)

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3
Q

What are the four major assemblies for the MK 20 MOD 0 and MOD 1?

A
  1. Full Face Mask (FFM) Assembly
  2. Umbilical-to-Mask Hose Assembly
  3. Communications Assembly
  4. Harness Assembly
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4
Q

What are the two different materials and three colors the Mask Body comes in?

A

Colors: Black, Gray and Yellow
Materials: Silicone and Natural Rubber

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5
Q

What may be used to aid in getting a proper seal?

A

Tygon Tubing

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6
Q

Which MK 20 configuration is required when diving in category 3 contaminated water?

A

MOD 0

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7
Q

For the MOD 0, what is the approximate positive pressure in the FFM that helps prevent water from entering the mask?

A

.03 psi

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8
Q

Which MK 20 configuration has a built in lever assembly on the second stage regulator?

A

MOD 0

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9
Q

What is the overbottom for the MK 20 that is surface supplied?

A

90 psig

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10
Q

What is the overbottom for the MK 20 that is in SCUBA mode?

A

Set to manufacture’s recommended pressure, but no lower than 135 psig

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11
Q

The air supply system must be able to provide a sustained flow of what to the divers?

A

1.4 acfm

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12
Q

Air consumption varies between what range? (with occasional faceplate and make clearing)

A

0.75 - 1.5 acfm

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13
Q

What breathing rate is considered free flow mode?

A

8 acfm

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14
Q

How many non-return valves does the MK 20 have?

A

Two

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15
Q

The built in relief in the MOD 0 and MOD 1 second stage regulator will lift and reset at what pressure?

A

Lift: 210 +/- 36 psig
Reset: 10 psig below set pressure

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16
Q

What is the length, inside diameter and hose rating of the Umbilical-to-Mask Hose Assembly?

A

Length: 30 inches long
Inside Diameter: 5/16
Hose Rating: 250 psi

17
Q

Mission Maintenance is required prior to a mission only if?

A
  1. Equipment has never been used
  2. Equipment has been idle for more than 18 months
  3. Condition of equipment is suspect
18
Q

What is an extended dive mission?

A

A dive mission that exceeds 30 days without any one break in service of seven days or more.

19
Q

When is a mission is due when?

A
  1. If a break in service of seven days or more is anticipated
  2. 30 day milestone is reached during extended dive mission
20
Q

SCUBA mode may be used if?

A

An ANU approved single hose first stage regulator with and an octopus, to the approved depth of the regulator as indicated in the ANU

21
Q

What current speed requires extra weight?

A

1.5 knots

22
Q

What are the MMP requirements for MK 20?

A

(Depth / .445) + 90 = MMP

*round up to the next whole number

23
Q

What breathing mode is considered heavy work?

A

6 acfm

SCUBA/UBA (5 decks)

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