Energy

Non-rechargeable (primary) lithium batteries play a critical role in aircraft systems—especially where reliability, safety, and traceable evidence are essential. Resonate Testing provides end-to-end programme support for RTCA DO-227A and DO-227B compliance, helping you generate high-quality evidence suitable for customer, certification, and authority review.

We focus not only on accurate testing, but on creating a clean, defensible, audit-ready evidence trail you can take forward with confidence.

What Are RTCA DO-227A and DO-227B?

DO-227A

RTCA DO-227A defines the Minimum Operational Performance Standard (MOPS) for non-rechargeable lithium batteries used in aviation. Programmes referencing DO-227A use defined test methods and evaluation criteria to demonstrate safety and operational performance in aircraft end items.

DO-227B

DO-227B is the updated revision of this standard. Where your customer or programme specifies DO-227B, we structure and report the qualification activities to align directly with this revision. Where DO-227A remains the requirement, we fully support the earlier structure.

Where DO-227 Applies in Aerospace

DO-227 is typically used when a non-rechargeable lithium battery is installed within an aircraft end item—often for:

• Emergency power
• Backup systems
• Aviation equipment that requires reliable standalone power

This framework is commonly linked with ETSO (e.g., ETSO-C142b) compliance pathways.

What We Can Support (Cell, Battery & End Item)

DO-227 programmes are commonly structured across three levels, ensuring that evidence is captured where it matters most.

1) Cell-Level Testing

Typical activities include:

• Capacity verification
• Environmental exposures (vibration, shock, temperature cycling, altitude, humidity)
• Safety tests: discharge current, polarity reversal, external short circuit, drop, venting assessments

2) Battery-Level Testing

A representative programme may include:

• Pre- and post-test capacity checks
• Vibration and shock
• Temperature cycling and altitude/decompression
• Humidity exposure
• Safety cases: polarity reversal, drop, external short circuit

3) End-Item Testing

Where behaviour depends on the actual system configuration, end-item tests may be required. These typically include:

• Functional tests (e.g., vibration, shock)
• Safety tests addressing thermal management and thermal runaway containment

How Resonate Runs DO-227A & DO-227B Programmes

Aerospace testing isn’t just about performing a test—it is about producing a credible, reviewable evidence pack.
We support you through:

• Translating your requirement into a structured test plan and qualification procedure
• Defining sample quantities and cascades that are workable and justifiable
• Agreeing instrumentation and reporting levels so results are actionable
• Running the programme with controlled documentation and recorded observations
• Producing reporting suitable for customer review and authority engagement