This is the intermediate level certification course for divers wishing to utilize a closed circuit rebreather (CCR) for mixed gas diving. The objective of the course is to train divers in the benefits, hazards and proper procedures for mixed gas diving on the unit specific CCR, utilizing a mixed gas diluent containing 16 percent or greater oxygen, and to develop intermediate CCR diving skills appropriate to technical diving to a maximum depth of 60 metres
1. Minimum age 18 2. Provide a verified log of a minimum of 50 rebreather hours distributed over a minimum of 50 dives on the specific rebreather. Valid logged dives must be deeper than 9 metres / 20 feet, at least 20 must be deeper than30 metres / 100 feet, and at least 10 dives requiring staged decompression. If the diver has 50 hours on another CCR unit recognized by TDI, only 25 hours/25 dives are required to be on the specific unit. If completing a unit crossover, provide proof of at least 10 logged CCR dives in the last 12 months. 3. Certified as a TDI Air Diluent Decompression Procedures Rebreather/ TDI CCR Helitrox Diluent Decompression Procedures Diver course or equivalent from agencies recognized by TDI
1. Open water drills practice air diluent dive and 50m fully-equipped CCR diver surface tow must be completed prior to conducting mixed gas diluent training dives
2. Minimum of 360 minutes open water training to be completed over a minimum of 6 dives including 1 equipment configuration and drills practice air diluent dive to a maximum 40 metres / 130 feet and a minimum 60 minute duration.
3. All subsequent dives to build incrementally in no greater than 10 metres / 33 feet st
4. A minimum of 5 dives must be conducted on mixed gas diluent.
5. All mixed gas dives are to be deeper than 40 metres / 130 feet, utilizing a mixed gas diluent containing 16 percent or greater oxygen, to a maximum depth of 60 metres/200 feet
6. A minimum of four dives must be decompression dives. At least two dives should be deeper than 50 metres/165 feet and at least one dive must have a total run time greater than 60 minutes.
Decompression obligation for the first two decompression dives must not exceed 30 minutes, and for the third and subsequent decompression dives, must not exceed 60 minutes. Course Structure 1. TDI allows instructors to structure courses according to the number of students participating and their skill level 2. Oral examinations are permitted if the exam is not available in a language the student understands Duration 1. Minimum of 6 hours for academic development and a further 2 hours for equipment configuration workshop Crossover 1. If a student already qualified as a TDI Mixed Gas CCR Diver or equivalent wishes to qualify on another CCR recognized by TDI, the student must meet all crossover requirements for Air Diluent Deco or Helitrox Deco CCR, follow all unit specific course standards, and meet all skill performance requirements. The only changes during the unit crossover are: a. Minimum of 120 minutes open water training to be completed over a minimum of 2 dives to a maximum of 60 metres / 200 feet. b. Must demonstrate proficiency in all required skills at the Mixed Gas diluent level
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