|Gerald Meux Jr Posted:18 Oct 2020 10:00 AM||Subject: Rule revision regarding wireless remote switches October 2020|
In February 2020, the Tripoli BoD adopted a rule requiring a physical disconnection from power for any electronics controlling energetics. At the time they felt this was required by NFPA 1127. After further discussion during its September meeting, the board of directors has concluded that additional physical disconnects are not required and the February 2020 rule has been canceled.
The rule requiring that energetics and firing circuits be inhibited until the rocket is in firing position remains in place.
I will see if I can find the newsletter with their official statement but they were careful in their wording and didn't say you were required to use a switch but something like "recommended".Praise be. Hopefully NAR will follow suit and I won’t worry anymore with my Protons if I’ve remembered to turn on deployment power - because they read closed circuit with deployment power off.
One might argue that NAR never prohibited electronic switches in the first place. In the March 2020 Electronic Rocketeer, NAR states in part:Praise be. Hopefully NAR will follow suit and I won’t worry anymore with my Protons if I’ve remembered to turn on deployment power - because they read closed circuit with deployment power off.
It was a recommendation for NAR. Neither organization prohibited electronic switches. Tripoli required that they be disconnected from power until after inspection. NAR never did.One might argue that NAR never prohibited electronic switches in the first place. In the March 2020 Electronic Rocketeer, NAR states in part:
WiFi or magnetic non-contact switches should be backed up with physical breaks in either the power or energetic circuits whenever the rocket is being transported, handled, or inspected. Rocket preparation areas, vehicles, and check-in areas can be electromagnetically "noisy" areas that can increase the possibility of an inadvertent firing circuit or energetic operation.
"Should be" sounds more like a recommendation than a mandate.
Cris,Remote arming is now considered to be "inhibited", as it was prior to the rule change. However, since the TRS does not have remote DISARMING, we recommend a switch on the deployment power so you can shut it off in case you have to take the rocket off the rack. The Quantum and Proton DO have remote disarming, plus a built-in switch for the deployment power that is not activated until launch-detect, so they do not require an external switch (which was the original TRA position).
If you read the TRA rule change, " additional physical disconnects are not required and the February 2020 rule has been canceled" pretty much says it all. Off is off... regardless of what interrupts the current flow.
I examined my preflight setup as a result, and changed a couple of things for the better. (I believe.)The whole discussion did get me to start re-examining how I handle my electronics mounting though, and my next generation of avionics bays are going to be a lot better for it. Still a few things to refine but the core concept I'm moving to is quite solid.