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17 Cards in this Set

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What are the advantages of the MK 25 MOD 2?


(fig. 19-2)

No surface bubbles


minimum support


long duration


fast deployment


good horizontal mobility



What are the disadvantages of the MK 25 MOD 2? (fig 19-2)

Limited to shallow depths


CNS O2 toxicity hazards


limited physical and thermal protection


What are the diving restrictions for the MK 25? (fig19-2)

Normal working limit: 25 fsw for :240.


Maximum working limit: 50 fsw for :10.


No excursions allowed when using single depth diving limits (SDL)

What are the operational considerations for the MK 25? (Fig 19-2)

Minimum personnel-5


buddy diver required


Chase boat

What factors increase the likelihood of O2 toxicity? (19-2.1.1)

Increased partial pressure of O2


Increased time of exposure


Prolonged immersion


Stress from strenuous physical exercise


Carbon dioxide buildup


Cold stress


Systemic dieseases that increase O2 consumption such as certain tyroid or adrenal disorders. (CCIISSP)

What is the tx. of a nonconvulsive O2 symptom? (19-2.1.3)

Stricken diver should alert his dive buddy


Controlled ascent to the surface


victims life preserver should be inflated if necessary.


watch stricken diver for other or worsening symptoms


Notify the diving supervisor and terminate dive


Tx. of U/W O2 convulsions? (19-2.1.4)

Assume a position behind the convulsing diver.


Leave the mouth piece in his mouth. If it is not in his mouth do not replace it, but if time permits switch the mouthpiece to the SURFACE position.


Controlled ascent to the surface, maintaining a slight psi. on the divers chest to assist exhalation.


Inflate victims life jacket if necessary for additional buoyancy and also on the surface.


Remove victims mouthpiece and switch the valve to the SURFACE mode to prevent rig flooding.


Signal for emergency pickup.


Once convulsing has subsided, open victims airway by tilting his head back slightly.


Ensure victim is breathing. Mouth to mouth breathing may be initiated if necessary.


If an upward excursion has occured during the convulsion, transport to the nearest appropriate chamber and have the victim evaluated by an individual trained to recognize and treat diving related illnesses.

What is the primary cause of hypoxia in the MK 25? (19-2.3.1)

Inadequate/incorrect purge of the UBA. The greatest risk of hypoxia is when the diver is breathing the UBA on the surface.

How are chemical injuries best prevented?(19-2.5.4)

Performance of a careful dip test during predive setup to detect any system leaks.


Ensure the position of the mouthpiece rotary valve upon water entry and exit to prevent entry of water into the breathing loop.


Dive buddies should perform a careful leak check on each other before leaving the surface at the start of the dive.

What is serous otitis media? (19-2.6.1)

Fluid present in the middle ear as a result of the differential pressure caused by middle ear O2 absorption syndrome.

Sofnolime 8-12 Mesh is only approved in what kind of Canister? (Table19-2)

MK 25 Mod 2 (urethane) canisters

What is the proper technique to fill the canister?


(19-3.3)


The canister should be oriented vertically.


It should be filled in 1/3 with the approved absorbent material and tapping on the sides of the canister with the hand or a rubber mallet.

What are the 2 revised categories for closed circuit O2 exposure limits? (19-4)

Transit with excursion Limits


Single Dept limit

What is the transit with excursion Limits Table?


(19-4.1)

It calls for a maximum dive depth of 20 fsw or shallower for the majority of the dive, but allow the diver to make a brief excursion to depths as great as 50 fsw. Only a single excursion is allowed.



21-40 fsw: :15


41-50 fsw: :05

What is the single-depth O2 Exposure Limits table?


(Table 19-4)

Depth Maximum O2 Time


25 fsw :240


30 fsw :80


35 fsw :25


40 fsw :15


50 fsw :10

What are the transit with excursion rules?(19-4.5.2)

Max total time of dive(O2 time) may not exceed :240


A single excursion may be taken at any time during the dive.


the diver must have returned to 20 fsw or shallower by the end of the prescribed excursion limit.


The time limit for the excursion is determined by the maximum depth attained during the excursion.

What is a successive O2 dive? (19-4.7.1)

A successive O2 dive is one that follows a prvious O2 dive after an off-O2 interval ofless than 2 hours.