---
type: "decision"
id: "2026-05-18-replace-the-bearings-on-all-four-spindles-of-line-3-during"
title: "Replace the bearings on all four spindles of Line 3 during the retrofit window, not one…"
date: "2026-05-18"
projects: ["projects/line-3-retrofit"]
people: ["people/thomas-huber", "people/nina-frei"]
source: "sources/2026-05-18-ticket-tck-0412-spindle-vibration"
tags: ["decision"]
---

# Replace the bearings on all four spindles of Line 3 during the retrofit window, not one…

Decided on 18.05.2026 in [[sources/2026-05-18-ticket-tck-0412-spindle-vibration|TCK-0412: Line 3 spindle 2 vibration and surface marks]].

Replace the bearings on all four spindles of Line 3 during the retrofit window, not one by one when they fail.

## Why

- spindles 1, 3 and 4 have the same running hours as spindle 2.

## Project

- [[projects/line-3-retrofit|Line 3 retrofit]]

## People

- [[people/thomas-huber|Thomas Huber]], Quality Manager
- [[people/nina-frei|Nina Frei]], Senior Maintenance Engineer