Somebody else got approved on your NSN. Here is how that happens.

If an NSN you reliably won has gone quiet, the most common explanation is not price. It is that the item's acquisition posture changed and other suppliers became eligible to quote it. DLA continuously screens items to see whether they can be bought competitively. When an item clears that screening, it moves from a restricted lane into an open one, new sources are approved, and an incumbent who was effectively alone starts losing awards to companies that were not eligible a year earlier.

This is a documented procurement process, not bad luck. It has a name (breakout), a governing regulation (DFARS PGI 217.7506), and a visible trail in the award record. This guide explains the mechanic, shows where it surfaces, and covers what an incumbent can actually do about it.

Why did I stop winning an item I used to win?

Four explanations account for most cases, and they are distinguishable.

1. The item opened to competition. Its acquisition posture changed from restricted to competitive, and suppliers who could not previously quote it now can.
2. A new source was approved in a lane that stayed restricted. The item still limits who may supply it, but the approved list grew by one.
3. Demand moved. The buy went to a long-term contract, the quantity pattern changed, or the requirement lapsed.
4. Your price stopped clearing. Real, and the easiest to check, but the one suppliers assume first and confirm least.

The first two are approved-source erosion. They are structural, they are permanent unless the posture changes back, and no pricing adjustment reverses them.

What does "breakout" actually mean?

Breakout is DLA screening a spare part to determine whether it can be acquired competitively rather than from a restricted set of sources. The program is governed by DFARS PGI 217.7506.

Two codes carry the outcome, and they appear together on an item record.

The Acquisition Method Code (AMC) is a single digit describing how the item may be bought:

AMC	What it means	What it means for your competition
0	Assigned during initial screening	Not yet screened; posture unknown
1	Suitable for competitive acquisition, second or subsequent time	Open competition, established
2	Suitable for competitive acquisition, first time	Newly opened to competition. A breakout just happened
3	Acquire directly from the actual manufacturer, second or subsequent time	Direct-from-maker lane, established
4	Acquire directly from the actual manufacturer, first time	Direct-from-maker lane, new
5	Acquire from a sole-source contractor that is not the manufacturer	Sole source through a dealer or prime

The read: 1 and 2 are the competitive lane, 3 through 5 are restricted. After the first buy under AMC 2 the code becomes 1, and after the first buy under AMC 4 it becomes 3 (PGI 2-201.1(e)).

That recoding matters more than it looks. AMC 2 is visible only briefly. It marks the single acquisition cycle in which an item first opened to competition, then it disappears into the much larger population of AMC 1 items. An incumbent who is not watching will see the code only in hindsight, if at all.

The Acquisition Method Suffix Code (AMSC) is a single letter explaining why the item sits where it does (the full AMC and AMSC decode is here). It is the more useful of the two, because it tells you whether the restriction can be overcome and by whom.

Can another company get approved on an item I supply?

That depends entirely on the suffix code, and the honest answer ranges from "yes, on a published path" to "effectively no."

A defined approval path exists. Codes T (QPL procedures), B (source control drawing), C (engineering source approval by the design control activity), and S (militarily sensitive technology). These name a process by which a new supplier can qualify. If your item carries one of these, your position is protected by a gate, not a wall, and the gate has a published key.

A physical condition decides. Codes K (class 1 castings), M (master or coordinated tooling), and N (special test or inspection facilities). Each becomes competitive the moment the underlying condition is satisfied for more than one source. If a second shop acquires the tooling, the item opens.

Effectively closed. Codes D, P, R, and V. The government lacks the data, lacks the rights, cannot economically obtain either, or the part carries reliability requirements that cannot be specified. These are stable positions.

Open already. Code G is the only suffix implying full and open competition. Code Z covers commercial and COTS items.

Provisional, and this is the one to watch. Code Q means the item has inadequate data or rights, has been in full screening for twelve months or longer, and breakout to competition is expected. It is explicitly a reverse-engineering candidate subject to mandatory periodic review. An item carrying AMSC Q is telling you, in the government's own coding, that its restricted status is on a clock.

What is the earliest warning I can get?

AMSC Q, on an item you currently supply, is the clearest early signal available in the public coding. It says screening is active, has been running a year or more, and is expected to end in competition. It is the difference between finding out during screening and finding out when an unfamiliar CAGE code wins your NSN.

Two caveats keep this honest.

The codes are not always on the solicitation. An RFQ frequently does not print AMC or AMSC. Where they are absent, posture has to be inferred from the approved CAGE and part list, technical-data availability, and qualification flags on the solicitation itself.

Posture is not a prediction. These codes describe how an item may be acquired. They do not tell you who will win, and no combination of them should be read as a win probability. An open item with weak competition can be more winnable than a restricted item with three hungry approved sources.

How would I see this in the award record?

Erosion leaves a specific signature, and it is visible in award history before it is visible in your revenue. Four signals show it arriving.

• Winner count rises. An NSN that showed one or two distinct winners over prior cycles begins showing three or four.
• An unfamiliar CAGE appears and repeats. One new winner is noise. The same new CAGE winning twice is a source that got approved.
• The award band widens downward. New entrants price to enter, so the low end of recent awards drops before the middle does.
• Your win interval stretches while the item's award frequency holds steady. The buys are still happening. They are going elsewhere.

Reading this well takes some care, because DIBBS award records show a total contract price without a quantity column, so unit prices have to be inferred by matching each award back to its solicited quantity. We covered that in detail in how to read DIBBS award history.

There is a deadline on looking. Visible RFQ records for a given issue date decay sharply, from roughly 1,900 at posting to about 322 at six months and 192 at twelve, and the document archive rolls off at roughly thirty days (DIBBSFlow measurement, 2026). History you did not capture while it was public is not retrievable later. Erosion is a slow pattern measured in cycles, which means it is exactly the kind of thing the public window is too short to show you in retrospect.

What can I actually do about it?

Ranked by what an incumbent controls.

Know your own posture first. Pull the acquisition posture for the items that carry your revenue. Suppliers routinely discover that a meaningful share of their book sits on items already coded competitive, or on items carrying AMSC Q.

Watch the qualify-first items hardest. T, B, C, and S items have a published path for a competitor to walk. Those are where a new approved source is a matter of someone deciding to do the work.

Treat a repeat unfamiliar CAGE as a finding. Not a bad month.

Decide deliberately whether to defend or redeploy. On an item that has genuinely opened, the incumbent advantage is real but finite: you know the part, the packaging, and the buying pattern. That advantage justifies a thinner margin to hold position on a recurring item. It does not justify defending every item at any price. Some items are worth conceding so the quoting time goes to items where you still hold structural advantage.

Look for the mirror image. Every breakout that costs an incumbent creates an opening for somebody else. Items moving into the competitive lane are items you may now be eligible to quote and were not before. The same screening that erodes one part of your book opens another.

Where DIBBSFlow fits

DIBBSFlow is a capture-intelligence platform built for DLA suppliers. It starts from your own DLA award record and shows what you win, what has moved away from you, and which open solicitations deserve your team's attention. The award history page describes what that view covers and what it does not.

DIBBSFlow supports opportunity review and capture workflow. It does not guarantee fit or award, confer approved-source status, or submit bids.

Frequently asked questions

How do I know if a new source was approved on my NSN? The approved-source list is item-specific and the clearest public signal is the award record: a CAGE code you have not seen before winning the item more than once. A change in acquisition posture, particularly an item moving into the competitive lane, is the structural version of the same event.

What does AMSC Q mean for an item I currently supply? It means the item has inadequate data or rights, has been in full screening for twelve months or more, and breakout to competition is expected. DFARS PGI subjects these items to mandatory periodic review. It is the government indicating that the item's restricted status is temporary.

Does becoming an approved source take long? It depends on the suffix code and the design control activity involved, and there is no universal timeline. QPL and engineering-source-approval paths are published processes with their own requirements. Anyone quoting a single duration or cost for source approval across all items is guessing.

If an item opened to competition, can it close again? Posture can be recoded, and screening decisions are subject to periodic review. Planning on an item closing back up is not a strategy an incumbent can execute.

Is losing an NSN always about price? No, and assuming so is the expensive mistake. On an item that opened to competition, the field changed. Repricing against a larger approved field is a different decision from repricing against the same two competitors.

Sources

1. DFARS PGI 217.7506, Spare Parts Breakout Program (AMC definitions at PGI 2-201.1; AMSC definitions in the same part). acquisition.gov/dfarspgi/pgi-217.7506-spare-parts-breakout-program. Retrieved 2026-07-28, AMSC set re-verified 2026-08-01.
2. DFARS PGI 2-201.1(e), recoding after first acquisition under AMC 2 or AMC 4.
3. DFARS PGI 2-203(b), mandatory periodic review for AMSC Q items.
4. DIBBSFlow measurement of public DIBBS RFQ records: visible records for a fixed issue date, re-queried over time. Measured 2026.