The Spare That Was Never Ordered

A depot had gone two years without a particular spare on the shelf. Not because it was unavailable, and not because anyone had decided to stop carrying it. Every time one was needed, a neighbouring site had one, and the fastest route to a working system was to borrow it.

The borrowing was logged. The shortage was not, because from the perspective of the ticket the fault was always resolved.

What borrowing conceals

• Restoration time stays inside target, so nothing escalates.
• The unfilled stock position never appears as a failure of its own.
• Two sites now share a single point of failure that neither of them records.

A workaround that performs well is the hardest kind to retire. It generates no incident, no variance, and no argument for the capital it would take to remove it. The organisation has not chosen to run without the spare. It has simply never been presented with the choice.

The thing worth asking at the depot is not why the spare is missing. It is which other conditions are being held together well enough that nobody has had to name them.