---
title: "Lufthansa could not buy this tiny latch. So it certified its own repair"
locale: "en"
url: "https://irz.fr/en/articles/lufthansa-titanium-latch-repair-en"
markdown_url: "https://irz.fr/en/articles/lufthansa-titanium-latch-repair-en.md"
category: "craft"
tags: ["Lufthansa Technik", "Materialise", "additive manufacturing", "titanium", "maintenance", "aviation"]
published_at: "2026-08-26T09:03:00.000Z"
author: "Léa Perrin"
translation: "https://irz.fr/fr/articles/lufthansa-titanium-latch-repair-fr.md"
---

# Lufthansa could not buy this tiny latch. So it certified its own repair

A fragile polymer latch forced replacement of an entire Airbus roller shutter. Lufthansa Technik redesigned it in titanium and qualified it as a separate spare.

The story starts with a part that fits in one hand. A small polymer latch hidden inside a galley roller shutter kept wearing out on Airbus A330, A340 and A380 aircraft.[1](https://www.materialise.com/en/inspiration/cases/lufthansa-technik-3d-printed-titanium-latch)

Inside the mechanism, the latch retains the roller brake and an endcap. The failure is not flight-critical. The maintenance problem came from the spare-parts catalogue: the original manufacturer did not sell the component separately. Lufthansa Technik had to replace **the whole roller shutter assembly** to fix one tiny part.[1](https://www.materialise.com/en/inspiration/cases/lufthansa-technik-3d-printed-titanium-latch)

Aviation Week puts that assembly in the four-figure price range.[5](https://aviationweek.com/mro/aircraft-propulsion/lufthansa-technik-taps-materialise-3d-printing-cabin-spares) The expense came less from the broken material than from the way the catalogue defined the repair.

Here additive manufacturing becomes a practical maintenance tool. It creates **a new level of spare part** where the catalogue previously offered none.

## The catalogue decides

The bill of materials also defines what a maintainer can replace on its own.

When the small wear item has no catalogue entry, maintenance ends up stocking the subassembly, waiting for delivery, cannibalizing another unit or discarding far more material than the fault requires.

> **A tiny failure, a large replacement unit**
> Diagram showing a small failed latch inside a complete roller shutter assembly
> - The failed part and the sold spare were different sizes
> - ROLLER SHUTTER ASSEMBLY · four-figure replacement
> - LATCH
> No standalone spare turned local wear into full-assembly replacement.

The original latch was injection-molded. That process makes sense for a large production run. Funding a new mold and supply chain for a low-volume spare may not.

Metal printing can support a small spare-parts run without rebuilding the economics of the original molding program.

## Do not copy it

Moving from polymer to Ti6Al4V changes the design problem, not merely the hardness of the part.

Materialise says Lufthansa Technik reconsidered **elastic response, geometry and wall thickness** so the metal latch would preserve the required behavior inside the mechanism.[1](https://www.materialise.com/en/inspiration/cases/lufthansa-technik-3d-printed-titanium-latch)

Plastic can flex where a rigid metal copy would push stress into neighboring parts. Shape can change with the material. The mechanism still needs the same function.

> REDESIGN
> **Same function, different material**
> - injection-molded polymer: Original
> - 3D-printed Ti6Al4V: New
> - fit and mechanism behavior: Preserve
> - elasticity, walls and geometry: Recalculate
> Changing the process creates real design work.

Materialise describes this stage as a redesign intended to improve the component while keeping it compatible with the existing assembly.[1](https://www.materialise.com/en/inspiration/cases/lufthansa-technik-3d-printed-titanium-latch)

## Permission to design

A harder question follows: who has authority to approve the new design for flight?

Lufthansa Technik operates with **Part 21 Subpart J design** and **Part 21 Subpart G production** capabilities for additive manufacturing.[2](https://www.lufthansa-technik.com/en/additive-manufacturing)

EASA describes Design Organisation Approval as recognition that an organization has the procedures, competence and resources required for its approved design scope.[3](https://www.easa.europa.eu/en/domains/aircraft-products/design-organisations/design-organisations-approvals) Subpart G covers production conformity with applicable design data.[4](https://www.easa.europa.eu/en/domains/aircraft-products/production-organisations-approvals)

Here Lufthansa Technik defines the part. Materialise manufactures to those requirements after audit and qualification as a metal additive supplier.[1](https://www.materialise.com/en/inspiration/cases/lufthansa-technik-3d-printed-titanium-latch)

The shortcut to avoid is simple: **a 3D file is not a certified part**.

## Qualify the process

Materialise makes the latch in its metal competence center under an EN 9100 quality system for metal parts.[1](https://www.materialise.com/en/inspiration/cases/lufthansa-technik-3d-printed-titanium-latch)

Before production, the teams aligned the manufacturing process, stability requirements and production controls.[1](https://www.materialise.com/en/inspiration/cases/lufthansa-technik-3d-printed-titanium-latch)

Geometry moves easily as a digital file. Powder, machine, parameters, post-processing and batch repeatability still need separate control.

> **The file is only one layer**
> Four-step chain from approved design to an in-service part
> - To fly, geometry crosses an entire chain
> - 1 · APPROVED DESIGN
> - 2 · QUALIFIED PROCESS
> - 3 · CONTROLLED PRODUCTION
> - 4 · IN-SERVICE PART
> Digital inventory moves part of the stock into controlled design and process data.

Materialise says parts from this qualified chain are now certified and already in service.[1](https://www.materialise.com/en/inspiration/cases/lufthansa-technik-3d-printed-titanium-latch)

## Inventory changes

For this failure, Lufthansa Technik no longer depends on the OEM supplying a complete shutter. It has an approved part definition and a qualified supplier able to make that component independently.[1](https://www.materialise.com/en/inspiration/cases/lufthansa-technik-3d-printed-titanium-latch)

This does not put a titanium powder-bed machine in every hangar. The system remains centralized: design authority at Lufthansa Technik, specialist production at Materialise.

“Digital inventory” is not an STL forgotten in a shared folder. It is a package of controlled data, responsibilities and processes that allows a part to be produced when needed.

## The right volume

At very high volume, injection molding obviously keeps a unit-cost advantage that metal additive is not trying to beat.

The calculation changes when spare-parts volume is low and **not having the standalone part costs more than producing it**.

Aviation Week notes that this latch avoids a four-figure assembly replacement and shortens the wait for a complete unit.[5](https://aviationweek.com/mro/aircraft-propulsion/lufthansa-technik-taps-materialise-3d-printing-cabin-spares)

Comparing printed titanium with molded plastic misses the maintenance problem. The useful equation is **certified latch versus full shutter + lead time + scrap**.

Additive can win without being the cheapest manufacturing process. It wins because it finally makes the correct repair unit purchasable.

## Repair the bill of materials

Part 21, EN 9100 and titanium make the story sound uniquely aerospace. Its starting problem is common across industry.

An industrial machine stops for a handle sold only with the door. A lab instrument waits for a bracket bundled into a larger assembly. An old device still works, but its spare-parts catalogue has vanished.

In those cases additive manufacturing matters beyond customization. It can **redraw the boundary of what is replaceable**.

Aviation mostly differs in the amount of evidence required before the new part can return to service.

The real manufactured object here is therefore not only a titanium latch. Lufthansa Technik and Materialise created **a new level in the maintenance bill of materials**.

## References

1. [Materialise, Lufthansa Technik's Unsourceable Latch, 2026](https://www.materialise.com/en/inspiration/cases/lufthansa-technik-3d-printed-titanium-latch)
2. [Lufthansa Technik, ADDITIVE Manufacturing](https://www.lufthansa-technik.com/en/additive-manufacturing)
3. [EASA, Design Organisations Approvals](https://www.easa.europa.eu/en/domains/aircraft-products/design-organisations/design-organisations-approvals)
4. [EASA, Production Organisations Approvals](https://www.easa.europa.eu/en/domains/aircraft-products/production-organisations-approvals)
5. [Thierry Dubois, Lufthansa Technik Taps Materialise 3D Printing For Cabin Spares, Aviation Week, August 18, 2026](https://aviationweek.com/mro/aircraft-propulsion/lufthansa-technik-taps-materialise-3d-printing-cabin-spares)