To me, there has to be more to this 'sacking' than we see here. While '180 to 4' is just NOT practical in anything but a Harrier or prop, ONE whoopsie should NOT result in a sacking.
There is a lot more to it than this one incident.
If you are on double secret probation you tow the line and are conservative.
You certainly DONT give the management any cause to issue a P45.