TDI Valve Drill sequence?

[ardhill]

Does the TDI have a particular sequence for their shut down drill or do you just faff around till you have cover all the knobs in your own way?

I mean do you have to do say:

- Main Reg off
- Isolator off
- Breath reg down
- Switch reg to back up
- main reg on
- back up reg off
- Breath it down
- switch to main
- Isolator on
- back up reg on

Or similar or does it not matter too much in what order it is done?

Thanks
.

[tootricky]

I don't think they advocate any particular sequence over any other, I would imange it depends a great deal on your instructor. On our Trimix course we used the GUE sequence of right post, isolator, left post.

Cheers/Nic

[ardhill]

Originally Posted by tootricky

I don't think they advocate any particular sequence over any other, I would imange it depends a great deal on your instructor.

Mr Powell

[tootricky]

Originally Posted by ardhill

Mr Powell

The same On my AN&DP we used the sequence you laid out. On the Trimix course we used the GUE sequence since we were all Fundies trained.

Cheers/Nic

[ardhill]

Thanks, I don't want to be getting into any particular 'rhythm' and find it was wrong.

[GLOC]

Originally Posted by ardhill

Thanks, I don't want to be getting into any particular 'rhythm' and find it was wrong.

Mark is happy for you to choose your flavour, TDI or GUE, but once you choose that style you must stay with it for the course and no flip-flopping halfway through a sequence!!

Consistency one way or the other.

[Peter M]

Was always taught to shut isolator first, save half gas and the right post to left post .

[ardhill]

Originally Posted by GLOC

Mark is happy for you to choose your flavour, TDI or GUE, but once you choose that style you must stay with it for the course and no flip-flopping halfway through a sequence!!

Consistency one way or the other.

Originally Posted by Peter M

Was always taught to shut isolator first, save half gas and the right post to left post .

The way I described it above is really the only way I have done it, with one exception...

Providing I don't mess up my trim or buoyancy, I can shut the main reg and isolator both together. But since I am talking about being on a course at the time and I guess I may be task loaded enough, I will probably stick with one at a time nice and steady.

My thinking behind the primary reg first is that it is the most likely one to be at fault since I am breathing that one. So, shut down the most likely cause of the freeflow first.

Peter in reality, I can do both at once, but as I only have the knobs partially open, even if I did them one at a time, I am not going to save that much gas in the couple of seconds it takes to move from one to another.
.

[Peter M]

Whatever routine you are comfortable with you do, i discussed this with my instructor and we came to this routine for many different reasons and i have stuck to it eversince.

[Mal Bridgeman]

I would follow the advice of choose a method and stick with it. If you think one day you might do GUE training then I would go for that method.

When I did my initial TDI training with Mark the sequence and technique was different.

1. Close Isolator
2. Close RH post (don't breathe down)
3. switch to backup
4. Clip off primary
5. Open RH post
6. Close left hand post (don't breathe down)
7. Unclip Primary
8. Switch to primary
9. Open left post
10. Open Manifold
    
11. Flow check

The GUE one is well described on the Team Foxturd pages and as I understand it the primary difference, other than sequence, is that GUE will attempt to fix a faulty 1st stage so the dive can continue, whereas the TDI method seemed aimed at training you to secure at least half your gas to perform your ascent.


HTH
Mal