Defence & Military (EN)
What is an Approved Vendor List (AVL) in the defense sector?
An Approved Vendor List is a customer-maintained register of suppliers formally released for defined parts, materials or processes. On a controlled programme only listed sources may be used, so an order cannot simply be moved to a cheaper shop. Getting listed requires a qualification process: document review, supplier audit, sample parts and first article approval.
Why controlled programmes work with fixed source lists
In defense and aerospace the source is part of the configuration. If a bracket has been qualified with material from one mill and heat treatment from one processor, changing either can change the properties of the part without changing the drawing. The approved vendor list is the mechanism that prevents such silent changes.
The consequence for purchasing is that price alone does not decide. A cheaper supplier who is not on the list first has to be qualified, which costs time and audit effort. For a listed supplier this creates stability; for a newcomer it creates a barrier that has to be planned for.
AVL, ASL, AML, QPL — what the terms mean
| Term | What it lists |
|---|---|
| AVL — approved vendor list | Suppliers released for defined parts, materials or processes |
| ASL — approved supplier list | Usually the same idea at company level, covering commercial as well as technical approval |
| AML — approved manufacturer list | The manufacturers of an item, as opposed to the distributors selling it |
| QPL — qualified products list | Products qualified against a specification, not companies |
| Special process accreditation | Processes such as heat treatment or non-destructive testing, accredited separately and audited on site |
The terms are used loosely in practice, so it is worth asking whether an approval covers the company, the site, a process or a specific part number.
How a supplier gets listed — and how it drops off
A typical qualification runs through a self-assessment questionnaire, a review of certificates and sample documentation, an on-site or remote audit, trial parts with a full inspection report, and finally a release limited to a defined scope of parts or processes.
Staying listed is a separate task. Most customers run supplier scorecards covering on-time delivery, defect rates, response times and the quality of corrective actions after a complaint. Repeated escapes, a missed corrective action or an unreported change of process or subcontractor can lead to a downgrade or removal — often faster than the original approval took.
Key points
- An AVL fixes which sources may be used on a programme; price alone cannot override it.
- Approvals are scoped — company, site, process or part number are not the same thing.
- Qualification runs through questionnaire, document review, audit, sample parts and release.
- Scorecards and unreported process changes decide whether the listing survives.
Related questions
Can a supplier apply to be added to an AVL?
Applications are possible, but lists are usually extended when the customer sees a need: a capacity gap, a single-source risk or a new technology. A concrete capability profile with evidence of comparable work is more effective than a general request. Supplier days and purchasing contacts are the practical entry points.
Does an approval at one prime count at another?
Not automatically. Each customer maintains its own list and its own criteria, so the audit usually has to be repeated. Existing certificates and a clean documentation set shorten the process considerably, because much of the evidence can be reused.
What happens if a listed supplier changes a subcontractor?
Changes to material sources, special processes or manufacturing locations are normally notifiable and often need approval before the first affected delivery. Making the change silently is one of the fastest ways to lose an approval, since it undermines the configuration control the list exists to protect.
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