20. The wrist display sensor in the MK-X unit works completely indepen- 

 dent of battery and electronics pack. 



21. In the event of a malfunction to a MK-X unit during a swim, it is 

 possible to buddy breathe from one unit with two divers. 



22. A fully charged battery package should last for approximately 8 hours 

 at any depth. 



23. A divers primary observation during a dive is the condition of the red 

 or yellow warning light on the wrist display, 



SHORT WRITTEN ANSWERS 



24. Under normal conditions, what are the two main causes for loss of 

 diluent? 



25. Give a brief description of the control breathing check. 



26. Which hand controls the diluent bypass valve? The oxygen bypass valve? 



27. Describe the procedure for transfer of a unit to the surface from the 

 habitat. 



28. If your chest display is in the low battery position, at what level will 

 the oxygen level be controlled? 



29. What are the normal display readings for the wrist and chest display 

 while conducting an air check on the surface? 



IN EACH OF THE FOLLOWING CONDITIONS, GIVE 

 THE PROBABLE CAUSE, IF APPLICABLE, AND 

 COURSE OF ACTION YOU WOULD TAKE: 



30. All p02 sensors reading within range, a red light is on. 



31. Both the yellow and red lights are lit on the wrist display. 



32. All p02 sensors reading within range, no yellow light, no red light. 



33. Any one of the three pOo sensors is fluctuating every 5 seconds. 



34. You are having trouble inhaling and equalizing. 



35. You are having no trouble breathing, but you feel you are not getting 

 enough air and you sense a change in your well-being. 



36. Exhalation effort is increasing. 



IV- 13 



