Overhead Diving Mexico

𝐈𝐌𝐏𝐎𝐑𝐓𝐀𝐍𝐓 𝐒𝐀𝐅𝐄𝐓𝐘 𝐍𝐎𝐓𝐈𝐂𝐄
𝐌𝐀𝐍𝐃𝐀𝐓𝐎𝐑𝐘 𝐒𝐀𝐅𝐄𝐓𝐘 𝐈𝐍𝐒𝐏𝐄𝐂𝐓𝐈𝐎𝐍 𝐀𝐍𝐃 𝐒𝐄𝐑𝐕𝐈𝐂𝐄 𝐂𝐀𝐌𝐏𝐀𝐈𝐆𝐍 𝐇𝐀𝐋𝐂𝐘𝐎𝐍 𝐎𝐗𝐘𝐆𝐄𝐍 𝐌𝐀𝐕 𝐑𝐄𝐆𝐔𝐋𝐀𝐓𝐎𝐑𝐒

Halcyon is initiating a safety inspection and service campaign for all oxygen MAV regulators used with the Symbios rebreather. The Symbios rebreather system should not be utilized until such inspection and service is conducted.

Halcyon has received reports of oxygen-fire events involving the oxygen-service MAV regulator assemblies used with the Symbios rebreather system. Halcyon has determined that some regulators may contain particles or manufacturing residue, increasing the risk of an oxygen fire. Additional inspection and service measures related to the MAV regulator assembly are required to further enhance safety and ensure continued compliance with Halcyon's oxygen-service standards.

Potential Hazard
Oxygen systems require strict cleanliness standards and proper oxygen-service handling procedures. Under certain conditions, contamination, improper servicing, component degradation, foreign material, or other factors may increase the risk of ignition within an oxygen system. Such an event may result in equipment damage and could present a risk of injury to users or nearby persons.

Corrective Action
Halcyon will inspect and service affected oxygen MAV regulators at no cost to the user.

As part of this service campaign, Halcyon will complete or arrange an assigned agent to:
- Inspect and verify oxygen-service cleanliness standards;
- Perform any required cleaning or corrective maintenance;
- Install a flow restrictor in the oxygen pressure-sensor supply circuit; and
- Verify proper assembly and operational performance before returning the unit to service.

The MAV regulator design successfully completed oxygen-compatibility testing. Halcyon added a flow restrictor to provide an additional margin of safety and further reduce the potential consequences of an oxygen-system ignition event. This restrictor will be added to units if not already configured.

Enhanced Manufacturing Controls
In response to this event, Halcyon has implemented enhanced inspection, assembly, cleaning, and quality-verification procedures, including in-house cleaning, assembly, and 100% inspection of MAV regulators used in current and future productions.

Required User Action
Email 𝐭𝐞𝐜𝐡𝐬𝐞𝐫𝐯𝐢𝐜𝐞𝐬@𝐡𝐚𝐥𝐜𝐲𝐨𝐧.𝐧𝐞𝐭

You should not use the oxygen MAV regulator until this service is conducted.

Buceo en cueva con CCR
Bailouts (tanques de respeto)

Ultimamente me han preguntado acerca de la cantidad de tanques de (bailout) respeto que se deben de llevar a la cueva cuando se bucea con rebreather "CCR"

En mi opinión, siempre se deben de llevar dos tanques de (bailout) respeto para contar con redundancia sobre todo en el caso de los rebreather's que no son autónomos y requieren una conexión a un cilindro externo, si solo llevan un cilindro y este falla ya no tienen forma de alimentar su rebreather ni tampoco manera de respirar en circuito abierto ni de mantener la flotabilidad.
En el caso de los rebreather's que son completamente autónomos, en cuanto al suministro de gases, también considero que se requieren dos tanques para que el Buzo tenga redundancia del sistema de flotabilidad y/o del traje seco
En conclusión, si se quiere bucear en la cueva con rebreather de forma segura y con redundancia se deben de llevar al menos dos cilindros extras de (bailout) respeto.

Pablo Bayardo

Alberto demostrando un muy buen trim sello de la casa

Un buen dia para bucear en el cenote!