West Atlantic ATP runway excursion in Birmingham

[DaveReidUK]

Originally Posted by Dusty_B

It is reportable as a "serious incident", covered by "Takeoff or landing incidents, such as undershooting, overrunning or running off the side of runways."
See Definition of Aircraft Accident and Serious Incident

Those are examples of occurrences which may or may not be categorised as a serious incident.

As the Annex 7 definition that you're quoting from says, the event must also involve "circumstances indicating that there was a high probability of an accident" to satisfy the definition. Obviously, that judgement is the AAIB's call.

Originally Posted by parkfell

ATC will have filed a MOR, and the pilot will have filed a ASR/MOR.
It is more than likely that ATC notified the AAIB that day.

The AAIB website on current field investigations is dated 17 February 2020.
Under current investigation is a runway excursion by a Global 6000 on 11 December 2019 at Liverpool.

All of that is true, and the AAIB was doubtless made aware of the occurrence.

But if they investigated every MOR and ASR, they would require many times the number of staff that they currently have.

Time will tell if we see the report in a future AAIB Bulletin. I'm not holding my breath.