[SystemSafety] Fwd: Re: Chicago controller halts Delta jet's near-miss....

[Matthew Squair]

There is also the potential for differences between military ATC and
civilian ATC. I recall one incident in UK airspace that occurred due to
such procedural differences, although after the event the procedures were
realigned in the UK.

The soft system interfaces and cultural boundaries can be just as important
as harder technical issues.


Matthew Squair

MIEAust, CPEng
Mob: +61 488770655
Email; Mattsquair at gmail.com
Web: http://criticaluncertainties.com

On 22 Jun 2015, at 4:25 pm, Bernd Sieker <sieker at causalis.com> wrote:

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On 22.06.2015 07:49, Peter Bernard Ladkin wrote:


1. ICAO phraseology and US FAA phraseology are by no means

identical, although they are similar. I don't seem to have my hand

on the FAA phraseology handbooks at present, so I can't check.


[...]


At a busy airport, I would have expected ATC: "[call sign] Position

and hold RWY XZ" for both


This is one particular phrase where the FAA has very recently (last
year?) adopted the ICAO variant "Line up and wait".


[...]


It is important to note that cognitive situations like this happen

all the time, but almost all of them do not evolve dangerously such

as this incident. They are also very hard to investigate if they

do. It is difficult to establish with any reliability who

understood what when, because people's hindsight into their

historical cognitive state is not very reliable.


What would probably have helped somewhat were the CVRs, but since the
Delta flight left within half an hour, it seems that that is gone.

SouthWest waited for a replacement aircraft, so do we know if it was a
high-speed abort, which perhaps required some maintenance checks to be
performed?



PBL

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