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ATP Technical File and Evidence Package: What Manufacturers Should Control
A practical structure for ATP technical documentation that connects the physical equipment to drawings, test evidence, type approval, production conformity, certificates and change history.
25 August 2026 · Technical Insights
KEY TAKEAWAY
A strong ATP technical file answers one question quickly: can an independent reviewer trace the equipment standing in front of them back to the exact evidence that supports its current classification?
IN THIS GUIDE
1. Think of the file as an evidence chain
The objective is not to collect documents for their own sake. Each record should help connect requirements, equipment identity, configuration, test evidence, approval and current in-service status.
The file should remain understandable after the original project team has moved on.
Good documentation reduces the distance between the physical equipment and the proof of its ATP status.
2. Control equipment identity first
Record manufacturer, model or type, body identification, serial numbers, relevant dates and the identity of the installed thermal appliance.
Identity fields should be consistent across drawings, test reports, certificates, plates and fleet records.
3. Keep the controlled design definition
Store the drawings, dimensions, insulation build-up, materials, doors, openings, structural details and other characteristics that define the approved body.
For serial production, revision control is essential so production units can be compared with the approved type.
4. Retain primary test and approval evidence
Keep the insulated-body test report, thermal-appliance performance evidence, equipment test reports and type-approval documentation relevant to the certification route.
Do not rely only on a summary spreadsheet if the primary report contains the configuration and conditions needed to interpret the result.
A number without its configuration and test conditions is weak evidence.
5. Control thermal-appliance configuration data
Record refrigeration-unit model, relevant variants, evaporator arrangement, installation configuration and control/software information where it affects the evidence basis.
Supplier performance curves should be tied to the conditions under which they are valid.
6. Document conformity of production
Where serial production relies on type approval, retain records showing how production remains within the approved technical type. Incoming materials, key dimensions, insulation processes and appliance configuration may all require control.
The level of control should follow the characteristics that can influence ATP performance.
7. Keep certification and in-service history together
Store certificates of compliance, distinguishing-mark details, plate information, periodic-check records, transfer documents and expiry dates in the same traceability structure.
This prevents the technical design file and the fleet-certification file from becoming disconnected.
8. Make modifications auditable
Every relevant change should have a record of what changed, why, who assessed its ATP impact and what evidence supported the decision.
Change request and affected serial numbers.
Before/after drawings or configuration data.
Thermal/compliance impact assessment.
Authority or testing-station correspondence where applicable.
Additional inspection or test evidence.
Certificate or marking updates where required.
Engineering perspective
A digital technical file works best when organized around the equipment identity rather than departmental folders. One equipment record should point to its approved baseline, current configuration, test evidence, certificate status and full change history.
Primary references
The ATP Agreement and its Annexes are the primary legal reference. Handbook comments support interpretation and harmonization but are not legally binding on Contracting Parties.
Related Technical Guides
Need technical guidance?
ATP Compliance provides independent engineering guidance on ATP classification, testing strategy, technical evidence and compliance readiness for temperature-controlled transport equipment.
ATP Compliance is an independent technical information and advisory platform and is not affiliated with UNECE, national competent authorities or official ATP test stations.
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