Week 10 Sim Session: A datalink-only sector

Fly a sector with no voice at all, and write down the moment you notice something you have stopped knowing

12 May 2027

Slots for the week 12 frequency check open this week. Book before you leave.

In the session#

Voice sector, twenty minutes. A normal sector, voice, shared frequency. This is the baseline and it is deliberately first.

Datalink sector, forty minutes. The same sector, same traffic, voice disabled. Clearances arrive as text on a display; you accept or reject.

It is immediately more comfortable. Nothing is misheard, nothing is stepped on, and nobody has to ask for a repeat. Several people report that it is the first time all semester they have felt competent.

Then, somewhere in the middle, most people notice something missing. Write down the moment you notice, and what it was. Common ones:

• You no longer know how busy the controller is.
• You no longer know what the aircraft ahead was told, so you cannot predict your own clearance.
• Somebody was given something odd and you have no idea.
• You have stopped building a picture and started waiting for instructions.

The planted event, last twenty minutes. There is one. It is the kind of thing week 9’s party-line exercise caught reliably and this configuration does not. We will not say in advance what it is.

Almost nobody catches it. When we replay it with voice enabled, most of the room does.

That contrast is the session, and it is the same measurement as week 9 run the other way round: week 9 showed you what the party line catches, and today shows you what its absence costs, on the same traffic.

What this session is not#

It is not an argument against datalink, and the debrief will be firm about that. Datalink removed a real class of accident and the comfort you felt in the second block is not an illusion.

The finding is narrower: an improvement that is genuinely an improvement can remove a property nobody wrote down. If you leave here thinking CPDLC is bad, you have taken the wrong thing. If you leave thinking I should ask what the messy old channel was doing for free, you have the course.

Afterwards#

Your noticing-moment goes in your notes and is the single most quoted thing in good audit limits sections. Book your frequency check slot on the way out.