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Article Highlights:
Jets and other aerospace products have decades-long program lifecycles, while the parts that sit inside of them might only stay in production for five or six years. That massive discrepancy is the root of one of the most expensive, recurring headaches in defense manufacturing.
When obsolescence is discovered late enough, redesign is the only option left. A board layout built around a part that no longer exists in any form has to be reengineered from the ground up. On a certified aerospace platform, this can mean re-triggering portions of the qualification process.
What separates a manageable obsolescence program from a less stable, more reactive one is often visibility: knowing a part's lifecycle status before it goes NRND or EOL, and having a qualified path forward before a redesign becomes the only option left.
Many of the fighter jets designed in the 1990s are still manufactured and expected to fly today. That means that the electronic components inside those aircraft must keep functioning inside of them, too.
But as anyone who’s worked in engineering, procurement, or supply chain resilience in the aerospace and defense industry knows full well, there’s a stark mismatch there. Those jets have decades-long program lifecycles, while the parts that sit inside of them might only stay in production for five or six years. That massive discrepancy is the root of one of the most expensive, recurring headaches in defense manufacturing. Product obsolescence doesn't announce itself with a press release. It shows up quietly, usually as a discontinuation notice (PDN) buried in a supplier bulletin. By the time an engineering team notices the PDN, a part critical to a weapons system or an avionics package may already be unavailable, forcing a time crunch to redesign the aircraft both quickly and safely.
For aerospace and defense programs, that redesign clock can be brutal. Requalifying a single component often requires a long path of testing and failure analysis, new documentation, and in some cases a full reopening of a certification process that took years to complete the first time. Multiply that across the tens of thousands of parts on a modern platform, and it's easy to see why obsolescence management has become such a formidable discipline in the $1 trillion aerospace and defense sector.
Why Product Obsolescence Hits Aerospace and Defense Harder Than Other Industries
Just like jet manufacturers and weapons makers, consumer electronics companies deal with component discontinuation. But they have an advantage that aerospace and defense programs don't: Their product lifecycles often match the lifespan of the semiconductors and other electronic components that go into them. A consumer device redesigned every 18 months rarely has to deal with a part that's gone obsolete in the middle of a large production run.
Defense and aerospace programs don't get that luxury. A platform can stay in service for 30 years or more, while the commercial semiconductor market driving most of the industry’s electronic components turns over parts every five to seven years, sometimes faster for leading-edge processing nodes. The Department of Defense even has a name for this chronic discordance: Diminishing Manufacturing Sources and Material Shortages, or DMSMS. DMSMS is tracked as a formal risk category on major programs precisely because product obsolescence isn't a hypothetical risk on a 30-year platform. For the majority of products in this sector, it’s a mathematical certainty.
Add in the compliance layers specific to this sector—ITAR restrictions, NDAA Section 1260H limitations on foreign-sourced components, and the general preference for domestically traceable supply chains—and the pool of qualified replacement parts shrinks even further when an original component disappears. A commercial engineer can swap in any functionally equivalent part from an alternative manufacturer. A defense engineer, on the other hand, often has a much shorter list of options that satisfy both the technical requirements and the regulatory ones.
The Real Cost of Reactive Obsolescence Management
Most obsolescence problems aren't discovered through good planning. They're discovered when a buyer goes to place a routine order and finds out that the part has been discontinued. Even worse, they sometimes don’t see the obsolescence event until a BOM with the part is deep into a production run. At that point, the options are limited, all of them are expensive, and the sense of urgency is reaching a fever pitch.
In instances like these, a last-time-buy can be a viable solution. But this sourcing strategy—in which a company purchases enough remaining inventory of a discontinued part to cover years of future production—ties up capital and warehouse space on components that are, by definition, no longer being manufactured. It also does nothing to permanently solve the problem at hand. It just buys the original equipment manufacturer time to develop and implement a more decisive resolution to the EOL part.
A form-fit-function replacement, where an engineering team qualifies a substitute part that behaves identically to the original, avoids the long-term storage problem but introduces its own cost: requalification testing, updated technical data packages, and an entirely new compliance picture. This is where product obsolescence most often escalates into a full redesign rather than a simple substitution—when the original part's specific packaging, tolerances, or country of origin can't be matched by anything currently in production.
And when obsolescence is discovered late enough, redesign is the only option left. A board layout built around a part that no longer exists in any form has to be reengineered from the ground up. On a certified aerospace platform, this can mean re-triggering portions of the qualification and certification process from the very first stages.
Building an Effective Obsolescence Management Strategy
The programs that avoid the worst of this aren't the ones with the biggest budgets. They're the ones that treat component lifecycle tracking as a continuous input to engineering decisions, rather than a fire drill that starts after a discontinuation notice lands.
Know Component Lifecycle Status Before Design
Every part that goes onto a bill of materials should carry a lifecycle status alongside its electrical specifications—active, not recommended for new design (NRND), or end-of-life. Designing in a part that's already flagged NRND is asking for an obsolescence problem before the platform even reaches production. This sounds obvious, but on programs with BOMs running into the thousands of line items, it's exactly the kind of detail that gets missed without a system actively surfacing it.
Monitor Continuously, Not Annually
Manufacturers don't typically wait for a convenient time to discontinue a part. And an annual compliance review isn't fast enough to catch a discontinuation notice before it becomes a shortage. Continuous, automated lifecycle monitoring tied directly to a program's active BOM means engineering and procurement find out about a pending end-of-life event the same week the manufacturer announces it, giving them months of runway to identify a viable alternative, secure stable sourcing for it, and incorporate it into the BOM.
Build a Bench of Qualified Alternates
For components with a history of shorter production runs or known obsolescence risk, identifying and pre-qualifying a form-fit-function replacement before it's needed turns a crisis into a routine substitution. This is especially valuable for parts subject to NDAA or ITAR restrictions, where the list of compliant alternates is already short and shouldn't be researched for the first time under deadline pressure.
Watch the Suppliers, Not Just Their Parts
Product obsolescence risk isn't only about preparing for and mitigating a specific component reaching EOL. It’s also about the risks ushered in by sole-sourcing from a supplier facing financial distress, a fab shifting capacity away from legacy process nodes, or geopolitical restrictions cutting off a previously qualified source entirely. A part can still technically be "active" while the supplier behind it is embroiled in circumstances that could eventually cut off their customers’ access to it.
Mitigate Product Obsolescence With Actionable, Proactive Insights
While the above-mentioned strategies can help companies prepare for the inevitability of obsolescence events in the aerospace and defense industry, none of them will eliminate the challenge of navigating those EOL events. Components will always reach end-of-life faster than a 30-year defense product’s expected service life. What separates a manageable obsolescence program from a less stable, more reactive one is often visibility: knowing a part's lifecycle status before it goes NRND or EOL, and having a qualified path forward before a redesign becomes the only option left.
Supply chain risk management (SCRM) tool Z2 gives engineering and procurement teams exactly that visibility, helping them to understand every angle of the obsolescence risk posed by their parts. Z2 provides industry-leading lifecycle forecasting based on an algorithm that has an accuracy rate of over 90%. This algorithm incorporates criteria that includes market demand, part activity, total manufacturing sites, and technology roadmaps to produce a credible projection of when a part will be obsoleted by its manufacturer. Alongside lifecycle status, these forecasts can be used as valuable resources that can help inform strategic decision-making around sourcing, procurement, and design.
To learn more about Z2’s obsolescence management capabilities—and how they can help aerospace and defense manufacturers manage their lifecycle challenges—schedule a free trial with one of our product experts.
