MK 20 UBA Flashcards
surface supply max depth for MK 20 is:
60 fsw
SCUBA max depth for MK 20 is:
190 fsw
which MK 20 mod is positive pressure?
MOD 0
which MK 20 mod is non-positive pressure?
MOD 1
which MK 20 mod is good for enclosed space diving?
MOD 0
which MK 20 mod is good for category 3 contaminated water?
MOD 0
which MK 20 mod is good for when you have a limited air supply?
MOD 1
what is the required material for the face mask when diving in contaminated water?
natural rubber
what is used to achieve a proper seal on the mask body assembly?
tygon tubing
the inner oral-nasal mask is made up of what components?
- pressure equalization assembly
- microphone
- two-way inhalation valves
the MK 20 MOD 0 second stage regulator is capable of maintaining a slight positive pressure in the FFM of approximately _____ psi
0.03 psi
what are the minimum / desired / maximum OBP operating limits for MK 20 surface supply?
- minimum: 90 psig
- desired: 135 psig
- maximum: 135 psig
for MK 20 SCUBA mode, the OBP is set to the manufacturer’s recommended pressure, but not lower than ______
135 psig
who controls the MMP?
console operator (topside)
MMP =
MMP = bottom pressure + OBP
or
MMP = (depth x 0.445) + OBP
the air supply system for MK 20 must be able to provide an average sustained flow of ____ acfm to divers
1.4 acfm
MK 20 free flow mode is ____ acfm
8 acfm
the MK 20 regulator has a built-in relief valve that will lift at _____ +/- ____ psig and reset at 10 psig below set pressure
210 +/- 36 psig
how long is the MK 20 hose assembly?
30 in
the MK 20 hose has a rated working pressure of:
250 psi
what are the two types of MK 20 communications assemblies?
- preamplified
- non-preamplified
the communication adapter is used for the ___________ assembly only
preamplified
what functional tests can be performed with the mini test kit?
- check valve sealing
- leak check
- automatic positive pressure
- exhalation resistance without positive pressure
- water tightness
- airflow capacity
an adequately charged SCUBA cylinder is defined as the pressure that provides sufficient air to bring the diver to his ______________ or __________
- first decompression stop
- surface (for no-decompression dives)
EGS OBP is set to ____ psi if submerged and ___ psi if topside
- 135 psi
- 150 psi
definition: dive mission
period of time during which the equipment is in continuous daily use
a MK 20 dive mission is considered complete if there is a break in service of ___ days or more
7
an extended MK 20 dive mission is one that exceeds ____ days without any break in service of 7 days or more
30
during extended dive missions, mission maintenance must be performed every ____ days
30
T/F: mission maintenance is required at the end of every dive mission as well as before a dive mission
FALSE: mission maintenance is required at the end of every dive mission but is no longer required before a dive mission unless certain conditions are met
mission maintenance is required prior to a mission only if one of which conditions apply?
- equipment has never been used
- equipment has been idle for more than 18 months
- condition of equipment is suspect (humidity)
when is mission maintenance not required prior to a mission?
if FFM has been idle for 18 months or less and bears a tag that certifies sat completion of the full maintenance procedure within the last 18 months
mission maintenance required at the END of every mission and when which conditions apply?
- diving supervisor anticipates immediate break in service of 7 days or more
- 30 day milestone is reached during extended dive mission
- condition of equipment is suspect
surface supplied max working limit for MK 20 is:
60 fsw
for MK 20 a current above ____ knots requires extra weight
1.5 knots
