Choosing the Right Acoustic Testing Model Starts with Understanding Your Program

Aerospace test strategy should follow the risks a program needs to address, the evidence required to support decisions, and the stage of the hardware lifecycle. NASA defines verification as demonstrating that a product conforms to its requirements and validation as confirming that it fulfills its intended use in the intended environment. The Aerospace Corporation’s Test Like You Fly guidance similarly emphasizes planning tests around mission-relevant configurations, conditions, interfaces, and operations.

When evaluating an acoustic testing model, the first question should therefore not be: “Should we own an acoustic test system?” A more useful question is: “What acoustic testing capability does the program need to control, and what can reasonably remain externally supported?”

Similar Tests, Different Program Needs

Consider two programs with similar acoustic qualification requirements. The first is developing a single spacecraft around a campaign planned well in advance. The configuration is relatively stable, and there is limited need for acoustic testing outside the formal qualification event. The second supports recurring hardware builds. Configurations continue to evolve, and test results influence design, integration, and production decisions throughout the year.

The acoustic environment may be comparable, but the appropriate testing model may not be. External capacity may suit the first program well. For the second, access to testing may become part of the development infrastructure. Organizations often begin evaluating in-house capability when coordinating the test becomes a larger constraint than performing it. Hardware readiness, facility availability, transportation, instrumentation, personnel, security access, and schedule margin must all align. The issue is no longer simply whether external testing is technically possible. It is whether dependence on external capacity creates risk or operating friction that the program can no longer absorb efficiently.

Four considerations can help clarify the decision.

1. Cadence and Schedule Exposure

Annual test count alone can be misleading. One planned qualification campaign may place less pressure on test infrastructure than smaller development tests occurring throughout the year. Conversely, several campaigns may still be efficiently outsourced when their timing and configurations are predictable.

The more important issue is what happens when testing is not available at the required moment. If the result controls anomaly closure, design release, integration, shipment, or another environmental test, delayed access can affect more than the campaign itself. The program should therefore consider the cost of schedule dependency alongside the direct cost of testing. Frequent testing does not automatically justify ownership. But recurring demand combined with unpredictable hardware readiness and consequential missed windows may make greater control strategically useful.

2. Routine and Exceptional Capacity

Programs should distinguish between the capability they need routinely and the capacity they may require only occasionally. A baseline configuration may support most development or production activity, while a larger spacecraft or more demanding campaign requires additional resources every few years.

Sizing permanent infrastructure around the largest conceivable test can leave capacity underused. Sizing only for current hardware can create a new constraint as the program evolves. The objective is not necessarily to own enough equipment for every future scenario. It is to define the normal requirement and decide how exceptional demand will be supported. This distinction is particularly relevant to scalable testing approaches. ARS describes the Neutron™ System as a modular Direct Field Acoustic Testing solution intended to support different test-article sizes and configurations.

3. Internal Competency and Operational Control

Owning equipment is not the same as possessing a testing capability. An in-house operation requires trained personnel, controlled procedures, maintenance, test planning, configuration management, instrumentation coordination, data review, safety practices, and clear technical authority.

Equipment can be installed comparatively quickly. Organizational competency takes time to establish and sustain. Programs considering ownership should determine who will conduct and approve tests, how operator proficiency will be maintained, and what outside support will remain necessary.

Operational restrictions may also shape the decision. Programs working with classified hardware, controlled data, restricted facilities, or limits on personnel and hardware movement may find it more practical to locate testing capability within the existing operating environment.

4. Lifecycle Economics

A useful business case compares lifecycle cost – not simply campaign fees against purchase price. An external model may involve campaign costs, travel, transportation, coordination, schedule contingency, and internal program-management effort. An ownership model may include equipment, installation, facility preparation, staffing, training, maintenance, certification, storage, upgrades, and the effort required to sustain proficiency.

Utilization matters, but it should not be the only threshold. A moderately used capability may be justified when it protects a high-value schedule or reduces recurring coordination. A heavily used system may still be a poor investment when the organization lacks the personnel or processes required to operate it effectively. The more useful comparison is: Cost of ownership versus cost of dependency, adjusted for schedule exposure and organizational readiness.

How the Engagement Models Follow

Once cadence, capacity, competency, control, and lifecycle cost have been assessed, the appropriate operating model usually becomes clearer.

Testing as a Service

A managed service is often appropriate when testing is occasional, campaigns can be planned in advance, or maintaining internal acoustic test operations would add unnecessary overhead. External testing can also be a deliberate choice for mature engineering organizations that prefer to focus internal resources on spacecraft development, integration, or systems engineering.

Owning an Acoustic Test System

Ownership becomes more relevant when recurring demand, changing hardware schedules, access restrictions, or downstream dependencies make direct control over testing strategically valuable. ARS offers the Neutron™ System as a turnkey in-house Direct Field Acoustic Noise (DFAN) testing capability. The current System Sales offering includes the hardware required to conduct a test, a formal Service Level Agreement, training, annual operator certification, and ongoing technical support.  The engineering value is not simply having equipment onsite. It is the ability to integrate acoustic testing more closely with the program’s hardware flow and decision cycle.

A Hybrid Model

Some organizations need dependable internal capability for routine work but occasionally require additional capacity. ARS’s Hybrid model allows a program to own its baseline system while drawing on additional ARS equipment and support when larger requirements arise. ARS identifies Testing as a Service, System Sales, and Hybrid as its three engagement models.  This separates routine demand from surge demand without requiring permanent infrastructure sized around the program’s maximum possible need.

Four Questions to Ask

Before selecting an acoustic testing model, program leaders should ask:

1. What decisions must the test support?
2. How predictable are testing demand and hardware readiness?
3. What happens when access is delayed or unavailable?
4. What capability should be permanent, and what can remain flexible?

The answer may change as the program matures. A service model that supports early development may no longer fit recurring production. An internal capability that was once essential may later become underused. The right acoustic testing model is the one that gives the program appropriate control over the evidence it needs—without creating more infrastructure, dependency, or operational burden than the mission requires.

Explore the ARS three engagement models and learn more on how we can support your mission.