The Wheel That Went Out

The classification matters because the remedy differs for each category.

1. The omitted spin check. Two readings are possible and the facts decide between them:

• If the interruption caused him to lose his place and he simply did not do the step, it is a skill-based lapse (omission) - right intention, incomplete action sequence, no conscious decision.
• The account says he considered it and decided against it because the jack handle fouled. That makes it a situational violation: a deliberate deviation from a written procedure, not for personal gain, but because the situation made compliance awkward. It is still unintended in its consequences. The distinction is the difference between his intention and his execution. If he consciously chose not to do it, calling it a 'lapse' would be wrong and would lead to the wrong fix.

2. The duplicate inspection. Signed by a person who arrived after the work was complete and could not have seen the item. That is a routine violation of the independent-check intent - a deviation accepted locally as normal.

3. The reset torque wrench. Moving the wrench after setting it introduces a genuine risk of an incorrect value. Whether this is an error at all depends on whether it was re-verified against a known reference; it should be treated as an unverified step until checked.

Think of independent defences as slices of Swiss cheese: each has holes, and an event needs the holes to line up. Here five slices failed together:

1. The task card. Correct and clear, but physical access made one step awkward, and no provision existed for 'the jack handle is in the way'.
2. The interruption. Eleven minutes away, no record on the card, no return-to-task routine, no review of what had and had not been done. The mental sequence was broken and never rebuilt.
3. Tool control. The wrench was moved and re-set by a second party; the setting had to be re-established and this was not verified.
4. Self-check. The technician was the only person who knew the spin had not been done; there was no prompt on the card to force a deliberate confirmation.
5. Duplicate inspection. Performed at the wrong time by someone who could not see the work - replaced a real barrier with a signature.
6. Release certification. Made on the basis of a card that was itself inaccurate.

The conclusion is that this was not a single careless act. Several of the holes - the absence of interruption management, the sequencing of the duplicate inspection, the awkward access - are latent organisational weaknesses that would have caught someone else eventually. That is what the investigation should target.

Apply a just-culture test rather than an automatic sanction.

Key questions:

• Substitution test: would another competent technician, in the same circumstances - interrupted, access blocked, under time pressure - have done the same? If yes, the primary failure is in the system and the system must change.
• Was the deviation conscious and concealed? A conscious decision not to perform a step, recorded as if it had been done, is more serious than an interruption-induced omission. Concealment is the aggravating factor, not the original mistake.
• Was there a history? Previous warnings for the same behaviour change the picture.

Likely outcome:

• The omission of the spin check, with the card signed, is a violation of the written procedure and warrants a proportionate response - retraining, a supervised period, a formal conversation. It does not on its own justify dismissal.
• The duplicate-inspection practice is a systemic and cultural problem: briefing, a change to when the inspection is scheduled, and audit of that card across the fleet.
• Whatever is decided, the reasoning must be communicated. If people believe that reporting or admitting an error automatically brings punishment, the next error will be hidden and the organisation will lose its warning system. The purpose of the response is a safer process, not a deterrent display.