[Kielhauler1961]

@ Steve,

It's the same principle why many airlines will not allow a co-pilot who has failed to make the grade for Captain to serve aboard a commercial aircraft after the event. American Airlines, I believe, brought this in and it has been adopted by other carriers, but not all.

Failure brings career ruin, an end of dreams. Some can accept that but many cannot.

There have been instances of failures being allowed to continue serving in a junior capacity in the past which have brought disaster. Some were deliberate as a way of getting 'even' with the system that rejected them, others because they were not competant anyway and should have been dismissed but slipped through the system.

It cannot be allowed for a failed professional to endanger any vehicle by design or by accident - they have been tested and found wanting and the system demands that they be rejected for the safety of others. That is the cardinal rule in safety-critical professional situations.

One strike and you're out. Where lives are at stake, there is no second chance.

KH