В Фейсбуке (там есть группа Sigma Tandem Instructors) нашел информацию по прошлогоднему тандем-фаталити в Мексике:
Mexico Tandem Incident Update: Please Read
When we first learned about the low cutaway to the ground in Mexico, it was naturally assumed based on eye witness accounts that the passenger cutaway the tandem pair, as:
it (however rare) had happened in the past
we have had a few tandem masters come forward and say that similar incidents occurred to them as they landed.
The learning point in that was to continue to train to always be vigilant in knowing where your students hands are at all times. That has not changed in terms of training method.
The incident however, uncovered an even more critical issue, one that we have been training against for years.
The root cause of the incident was that the tandem instructor disconnected the side laterals and left them hanging off of the side of the passenger harness. During a turn at some point during the final pattern (still unknown exact height, but presumably around 300-400ft) a steering toggle got caught on the side connector quick ejector and induced a turn. The tandem instructor then disconnected the RSL (for reasons unknown) and cutaway from the spinning main canopy and manually activated the reserve too low the ground for it to fully deploy. During this event, the passenger reached out and came into possession of the passenger handle or its cables. This is why the handle was found with the passenger not the instructor.
Since July 2015, we have been using a new logbook, one that contracts the new Tis to follow our SOPs, which includes disconnecting the side laterals, loosening them, and reattaching them to the instructor harness. This is one of the reasons. We know there are "old school" TIs still out there, not bound by this SOP contract, that refuse to change their SOPs. I say this not to chastise them, but simply to ask emphatically that if you are working with anyone that is not reattaching the side laterals to the instructor harness they MUST reattach them to the passenger harness rings or to each other, so that they do not hang to the side. This toggle snag scenario has happened a number of times over the years. Most of the time it is cleared by the TI, occassionally it leads to a low turn to the ground, this is the first instance of it being the root cause of an incident. We can prevent this from ever happening again by being vigilant about re-securing the side lateral quick ejectors after opening. Please bring this up at your next staff meetings, and speak to every instructor you work with about this.
Thank you one and all for your commitment to safety in the field. You are making a big difference out there.
Если очень кратко: то стропа управления зацепилась за отстегнутый боковой карабин (слабо представляю, как это возможно, но так написано). RSL был отключен (Сильный ветер?), инструктор выполнил отцепку и ввод запаски, которая наполниться уже не успела. И утверждается, что пассажир в какой-то момент схватился за тросики подушки отцепки.
Вот как-то так. Каждый мнит себя стратегом, видя бой со стороны, но мне думается, что тандем-пару, в данной ситуации, теоретически мог бы спасти только прямой ввод запаски без отцепки.