Yup... Know the 'two's' very well.. ;-) However, don't forget the pre - predive two's.... If I have time later tonight I'll post 'em - but I'm in the middle of some work right now! ok - quickly though...
EQUIPMENT CHECK: 3 - TWO'S CHECK LIST. A. ANALYZE TWO TANKS FOR CONTENT:1 OXYGEN; 2 DILUENT;3 OFF BOARD GAs B CANISTER & ELECTRONICS: 1 CHECK SCRUBBER, SPACER & ABSORBENT USE & TIME (2 hours), 2 Orings; 2 CHECK O2 SOLENOID CONNECTION, OPERATION & ELECTRONICS C LEAK TEST COUNTER LUNGS: 1 POSITIVE TEST; 2: NEGATIVE TEST Sorry - I have it in excel format and it didn't come up right on the post..... Quote: (Originally Posted by
trob09)
Separate from the manufacturer's list, here's what I do on every dive:
Gas, gauge, lungs, lift, lips, computer, count...
Gas - check O2, Dil & Bailout valves, make sure they are turned on
Gauge - check gauges, confirm available gas supply (O2, Dil & bailout)
Lungs - Check counter-lungs, test O2 & ADV manual add, test ADV isolator, check OPV on exhale lung..set to appropriate positions
Lift - test drysuit inflator and BC inflator
Lips - Check regs (bail-out) and DSV (test open/closed)
Computer - check that it's on & functioning and working it's way toward selected setpoint, compare handset(s) to HUD
Count - 2 minute pre-breathe - watch computer/HUD track setpoint. Watch for any funny feelings during pre-breathe.
The above is done on the bench, fully kitted up before I splash. When I splash, I go through the same again on my way to 20', purging the loop & adding O2 to test cell responsiveness & current limitations. In the water, "count" becomes "current" for checking current limits of cells.
Several others on the list will recognize these as "the 2's" we learned from our instructor, I simply added the gas, gauge...Mnemonic for myself.
There are, of course, numerous checks before I get to this point, largely based on the manufacturer's check-list and recommendations.