Source Approval Requests: The Pains, Gains, Process, and Opportunity
How manufacturers can use SARs to challenge sole-source positions, qualify as alternate suppliers, and compete for DLA spare-parts contracts
Ever wonder why a $3 fuel filter can cost the Army $700, why a scrap-metal pin can sell for $71, or how an inexpensive commercial item can carry a markup measured in the thousands of percent? It is not necessarily corruption or illegal conduct. Often, it is the result of a closed supply chain in which only one source is technically approved to manufacture a military spare part.
A Source Approval Request, commonly called a SAR, is the mechanism a prospective supplier can use to challenge that lock. A successful SAR does not award a contract, but it can qualify a manufacturer to compete for future purchases of a specific National Stock Number (NSN). For machine shops, precision manufacturers, reverse-engineering firms, current OEM subcontractors, and businesses with an established Department of Defense contracting history, that can open a market that may have been sole- or single-source for years.
The opportunity is real, but so are the difficulties. A SAR is not a cover letter attached to a drawing. It is a defined technical package that must be written correctly, routed to the right organization, supported by legally obtained technical data, and followed by any required testing, quality, packaging, marking, and delivery controls.
This guide explains the complete process: what a SAR is, why sole-source parts exist, how to identify a worthwhile opportunity, how to assemble and submit the package, what pain points to expect, and what government data reveals about the small businesses already succeeding in reverse engineering and alternate sourcing at the Defense Logistics Agency.
What Is a Source Approval Request?
Most defense contractors know the DLA Internet Bid Board System (DIBBS) as the place to find and bid on open-competition parts. However, a substantial share of the Defense Logistics Agency's catalog is not open to every capable manufacturer. DLA manages roughly four million consumable spare parts—about 93% of the consumable items used by the military services—and a large portion of that catalog is coded as sole- or single-source.
According to the DLA Source Approval Request and Alternate Offer Guide, a SAR is "a package of information provided by a prospective new supplier to become an approved source" for a specific NSN.
Critically, a SAR is not a bid. It is the technical qualification a new supplier must clear before it is allowed to compete. As DLA explains, becoming an approved source "only grants the opportunity to compete and supply the item—it does not guarantee future contracts, orders, or a specific level of financial commitment."
The manufacturer that successfully completes the process can become an alternate approved source and create competition where only one qualified supplier may have existed. That approval can position the company to pursue future procurements for the item, but approval alone does not lock up the market or guarantee that the company will receive an award.
Why Do Sole-Source Parts Exist?
A military spare part may remain sole-source for several reasons:
- The government does not own the necessary technical-data rights.
- The part is a Critical Safety Item for which a design-control activity restricts who may manufacture it.
- The government drawing identifies only the original manufacturer's part number.
- No alternate manufacturer has completed the technical qualification and source-approval process.
This is not a new problem. A 1983 Government Accountability Office report documented how uncertainty over technical-data rights was preventing competition for Air Force spare parts. Decades later, incomplete government access to technical data continues to make alternate sourcing difficult.
The Financial Impact of Sole-Source Pricing
The dollars at stake are well documented. A series of Department of Defense Inspector General audits and related reports has shown what can happen when the government has only one qualified source:
- TransDigm earned $16.1 million in excess profit on 46 of 47 parts reviewed, with profit margins ranging from 17% to 4,451%, according to a 2019 audit. A 2021 follow-up found $20.8 million in excess profit on 105 of 106 parts, with one part reaching a 3,850.6% profit.
- The DoD Inspector General found that Boeing charged the Army $71.01 for a metal pin that the government already had in stock for 4 cents—a markup of more than 177,000%—under a Corpus Christi Army Depot sustainment contract.
- The Air Force paid Boeing a 7,943% markup—more than 80 times the commercial price—for a lavatory soap dispenser used on the C-17. The charge was part of nearly $1 million in overcharges identified across 46 sampled parts in an October 2024 audit.
- Sikorsky charged the Army $2,393.41 for a plastic wiring-box cover valued at $181.70 for UH-60 Black Hawk parts, according to a DoD Inspector General audit reported by Bloomberg.
- The DoD Inspector General separately found that DLA potentially overpaid Bell Helicopter $9 million on 33 of 35 sole-source commercial parts.
These prices are not automatically illegal. They demonstrate what can occur when exactly one source is qualified and no second manufacturer has successfully completed the paperwork and technical process required to compete.
Who Should Consider Pursuing a SAR?
The strongest candidates include:
- Machine shops and manufacturers with precision-manufacturing or reverse-engineering capabilities.
- Companies that already build the same or a similar part as a subcontractor to an original equipment manufacturer.
- Firms with an established DoD manufacturing or contracting record.
- Small, agile manufacturers capable of producing low-volume or hard-to-source defense components.
DLA Aviation's own guidance is candid: without "a significant history of producing items for the Government," the military services are "unlikely to approve" a new source for a reverse-engineered item. Existing government-contract relationships and past performance are therefore meaningful advantages, not merely nice-to-have qualifications.
Step 1: Determine Whether the NSN Is Worth Pursuing
Before investing in engineering, documentation, testing, or special tooling, determine whether the NSN has enough sustained demand to justify the effort.
Use DLA's public systems to research the item:
- Use DIBBS to check current solicitation activity and obtain any competitive drawings that are available.
- Use PUB LOG/FLIS to identify the item, determine how many military services use it, and review the currently approved sources.
- Evaluate the item's acquisition method, source-control status, Annual Demand Value, procurement history, estimated quantity, and frequency of purchases.
- Determine whether an active solicitation exists, because that changes both the submission route and how the package will be treated.
DLA guidance warns that a SAR may not be processed if demand for the item is too low to justify the government's review effort. Companies should therefore target NSNs with real, recurring demand rather than isolated, one-time purchases.
The economics work best when SAR development becomes a repeatable organizational capability rather than a one-off project. A manufacturer that creates reliable processes for opportunity screening, reverse engineering, technical documentation, quality control, and submission management can evaluate and pursue multiple high-value NSNs more efficiently.
Step 2: Select the Correct SAR Category
The DLA SAR and Alternate Offer Guide identifies four package categories. The applicable category determines the technical evidence the manufacturer must provide:
- Category I—Actual Item: The company already manufactures the exact item for the OEM or DoD, typically with production occurring within the last several years.
- Category II—Similar Item: The company manufactures an item that is similar in complexity, design, and application and legally possesses the rights to the OEM's technical-data package.
- Category III—New Manufacturer: The company legally possesses the OEM's technical data and intends to manufacture the item to that data.
- Category IV—Reverse-Engineered Part: The company does not possess the OEM's technical data and therefore reverse-engineers the item at its own expense.
Selecting the category is not a labeling exercise. It establishes how the company will prove that it understands the design, owns or legally obtained the data it plans to use, can manufacture the item, and can satisfy the government's technical and quality requirements.
Step 3: Build the Complete Technical Package
Every SAR follows a defined checklist organized into Sections A through T. At a minimum, the package must include the following:
Section A: Cover Letter
The cover letter should identify:
- The SAR category.
- The NSN.
- The applicable weapon system.
- The proposed unit price at relevant quantity breaks.
- The company's quality-system documentation, such as AS9100 or ISO 9001.
Section B: Part Drawings
The package must include the actual drawings needed to define and manufacture the proposed part. The drawings must be consistent with the data rights and certification asserted elsewhere in the package.
Section C: Detailed Manufacturing Plan
DLA explicitly states that generic routing sheets are not sufficient. The submission must include actual process or operation sheets in manufacturing sequence, including applicable tolerances, inspections, materials, and special processes.
Section D: Master Tooling Certification
Where applicable, the company must certify the master tooling it will use to manufacture and inspect the item.
Section E: Data Certification
A company officer must sign a letter certifying that the technical data used in the package was obtained legally. This is not a formality. Knowingly making a false statement about technical-data rights can be prosecuted under 18 U.S.C. § 1001.
Category-Specific Evidence
Category II packages require a detailed Comparative Analysis. The DLA Guide specifically warns that "a vague Comparative Analysis will not be considered adequate and may hurt your opportunity." The analysis must clearly demonstrate how the similar item compares in design, materials, complexity, performance, application, manufacturing methods, tolerances, testing, and other relevant technical characteristics.
Category IV packages require a complete reverse-engineering manufacturing plan that demonstrates how the company derived the necessary design information and how it will manufacture and validate the replacement part.
A technically capable manufacturer can still lose months if the package is incomplete. Missing, vague, inconsistent, or unsupported documentation can cause the submission to be returned, require resubmission, or restart portions of the review.
What If the Company Does Not Have the OEM's Technical Data?
A manufacturer without the OEM's drawings is not automatically excluded. DLA operates the Replenishment Parts Purchase or Borrow (RPPOB) program so companies can visually inspect, borrow, or purchase government-owned material for the purpose of reverse engineering an item.
DLA Aviation establishes a minimum $40,000 Annual Demand Value threshold for RPPOB parts. DLA Land & Maritime also maintains a Limited Source NSN List that targets items with more than $10,000 in demand and only one or two current manufacturers.
The RPPOB process provides a lawful path for examining a sample part without claiming rights to an OEM's proprietary drawings. The company must still produce its own compliant technical package and must never submit technical data that it cannot legally certify.
Step 4: Submit the SAR to the Right Organization
Routing is one of the most common failure points in the process. A technically complete SAR can still stall for months if it goes to the wrong office.
The central rule is:
- If an active solicitation exists, the SAR is submitted as an "Alternate Offer" to the Contracting Officer identified in the solicitation.
- If no solicitation is open, the package is submitted to the appropriate DLA command's source-approval office.
The DLA SAR and Alternate Offer Guide also explains that the ninth character of the solicitation number matters. Automated solicitations will not consider an alternate offer for the current purchase; the offer can be evaluated only for future procurements.
Each DLA command handles the routing somewhat differently:
- DLA Land & Maritime, Columbus, Ohio: A SAR submitted without an open solicitation goes to the Competition Advocate/Alternate Offer Monitor group. That office reviews the submission and routes it to Value Engineering for technical evaluation, as described in the command's Value Engineering SAR briefing.
- DLA Aviation, Richmond, Virginia: Reverse-engineered items follow the RPPOB/New Source Contract Step-by-Step process. If a solicitation is open, the package is routed to the buyer identified in the solicitation.
- DLA Troop Support, Philadelphia, Pennsylvania: The command manages its own industrial-hardware and First Article Testing monitoring functions under the overarching SAR Guide.
Who Reviews and Decides?
Several government roles may participate:
- The SAR/Alternate Offer Monitor logs the package and performs the initial completeness review.
- The Item Manager or Product Specialist owns the supply picture for the NSN.
- The Engineering Support Activity (ESA) is the military-service organization with technical authority over the part and makes the ultimate technical approval or rejection decision when service approval is required.
The ESA's role is especially important for Critical Safety Items and service-managed weapon systems. In those cases, DLA cannot approve a new source unilaterally. It must forward the package to the applicable military service's ESA, which is one reason the process can take substantially longer when technical authority rests with the service rather than DLA.
Step 5: Plan for the Review Timeline
DLA guidance states that review will generally take a minimum of 90 days and may take 180 days or longer. When the SAR requires evaluation by a military-service ESA, the timeline can extend much further. DLA Aviation has noted that Navy and Army ESA reviews require a minimum of 180 days, which can push the total process toward a year.
The broader technical-data problem can create even longer delays. GAO found that the data-collection process associated with one spare-parts contract lagged by 1,154 days.
Long periods without visible movement are frustrating, but the most effective mitigation remains within the applicant's control: submit a complete, internally consistent package the first time. Missing documentation, vague comparisons, unsupported claims, and data-rights questions can stop the review and restart the clock.
Step 6: Budget for First Article Testing
First Article Testing (FAT) is a separate, post-award requirement that may have to be completed before production begins. It can require the contractor to manufacture and pay for the test article, special tooling, laboratory work, inspections, or other validation activities.
Before pricing the opportunity, determine whether the item qualifies for a waiver. Under DLAD 9.304, reverse-engineered items and items assigned AMSC codes T, Z, D, H, and P are exempt from FAT.
If no exception applies, include a dedicated FAT line item in the proposal rather than absorbing the cost. FAT expenses can materially change the economics of a seemingly attractive spare-parts opportunity.
Step 7: Prepare for Packaging, Marking, and IUID Requirements
Technical approval is not the final compliance hurdle. A supplier must also deliver the item in accordance with applicable packaging, marking, and identification requirements.
Under DFARS 252.211-7003, qualifying items above the applicable dollar threshold require a permanent Item Unique Identifier (IUID) encoded in a two-dimensional Data Matrix and registered in the DoD IUID Registry. The Office of the Under Secretary of Defense's IUID guidance states that "there are no exceptions" for qualifying items.
Manufacturers should budget for compliant marking equipment or outsource the marking process. These costs are generally allowable under FAR Part 31. Failure to meet packaging, marking, or IUID requirements can cause the government to reject a shipment even when the manufactured part itself is technically acceptable.
Step 8: Meet the Quality-System Prerequisites
Manufacturers should expect DLA to require an established quality-management system, such as AS9100 or ISO 9001, as a baseline before it seriously evaluates the package. The SAR must also be supported by documented inspection-method sheets and the quality controls necessary to demonstrate repeatable conformity.
Quality certification alone is not enough. The package should connect the company's quality system to the actual manufacturing steps, tolerances, inspections, special processes, test methods, and acceptance criteria applicable to the item.
The 6 Most Common SAR Pain Points—and How to Overcome Them
1. No Access to Technical Data
The lack of government-owned technical-data rights is one of the primary reasons sole-source items remain sole-source. The practical alternative is a Category IV reverse-engineering effort supported, when eligible, through the RPPOB program. A company can legally borrow or purchase a sample rather than relying on the OEM's proprietary drawings.
The manufacturer must protect itself and the government by using only data it obtained legally. Section E of the SAR package is a signed, legally binding certification.
2. Long and Opaque Timelines
DLA's own estimates place the initial review at 90 to 180 days or longer, with service-level ESA review potentially adding at least another 180 days. Companies should build a realistic pursuit timeline, maintain records of every submission and communication, and avoid planning revenue around an assumed rapid approval.
Submitting a complete package the first time is the best practical way to reduce avoidable delay.
3. First Article Testing Costs
FAT can require the company to pay for an initial test article, tooling, inspections, and laboratory work before production begins. Verify whether the item qualifies for a DLAD 9.304 exception. If it does not, price FAT separately in the proposal.
4. Packaging, Marking, and IUID Compliance
A technically acceptable part can still be rejected if it is improperly packaged, marked, or registered. Determine the applicable DFARS, DLA packaging, and IUID requirements early enough to purchase equipment, qualify a subcontractor, train employees, and price the work accurately.
5. Quality-System Requirements
AS9100 or ISO 9001 certification and documented inspection controls should be treated as entry requirements, not tasks to address after the SAR is submitted. Companies that lack the required quality infrastructure should resolve that gap before investing heavily in a target NSN.
6. Cost and Effort Versus Payoff
A SAR can require substantial engineering labor, documentation, tooling, testing, and waiting. Target high-demand NSNs and develop repeatable internal processes so that the company's investment produces a durable alternate-sourcing capability rather than a single speculative submission.
Where eligible, DLA's Small Business Innovation Research and Small Business Technology Transfer mechanisms may help offset reverse-engineering expenses.
Who Is Winning at DLA Reverse Engineering and Alternate Sourcing?
The clearest government data comes from a 2019 GAO review of DLA's reverse-engineering program. GAO found that from fiscal years 2015 through 2018, DLA initiated more than 1,600 reverse-engineering projects across its Aviation, Land & Maritime, and Troop Support commands.
Of the 124 contractors that performed the work, 103—83%—were small businesses.
GAO also confirmed that DLA's commands had implemented safeguards to protect contractors' intellectual property during the reverse-engineering process. That protection matters to manufacturers concerned about providing proprietary reverse-engineering work to the government.
The companies breaking sole-source positions at DLA are therefore not limited to defense giants. Government data shows that small businesses perform the large majority of this reverse-engineering work.
How DLA Is Funding the Pipeline
DLA directly funds a meaningful portion of this work through its Small Business Innovation Research (SBIR) program. DLA's topic announcements describe the objective plainly: enable "the Small Business Manufacturer to qualify as a source of supply for the DLA NSN(s) to improve DLA NSN availability, provide competition for reduced lead time and cost."
One example is DLA's 23.3 SBIR announcement. In practice, an eligible small manufacturer may be able to obtain government funding that helps pay for the reverse-engineering and technical-data-package work required to support source qualification. This directly addresses one of the largest barriers for companies that do not have access to OEM technical data.
A Recent Example: Additive Manufacturing Creates a New Competitive Source
In November 2024, DLA awarded its first competitive contract for an additively manufactured part. The procurement covered 1,300 F-15 pylon bumpers, a part that previously had been produced only through sole-source or organic government-depot channels.
DLA Additive Manufacturing Program Manager Tony Delgado described the award as proof that DLA can now "procure parts that are additively manufactured through open sources." He called that outcome the "best of all worlds" because "it inspires competition among vendors and gives us more options."
The award is a direct, dated signal that DLA is actively trying to expand its base of qualified alternate sources rather than merely tolerating them.
What the Opportunity Means for Manufacturers and Advisors
The data supports a strategy built on speed, specificity, and technical credibility. Small, agile businesses with real reverse-engineering or precision-manufacturing capability are exactly the companies GAO found performing this work, and DLA is investing grant dollars to recruit and qualify more of them.
The opportunity is not hypothetical. It is a documented and funded government priority. However, success depends on choosing an NSN with sufficient demand, selecting the correct SAR category, assembling a complete technical package, establishing lawful rights to all technical data, routing the package correctly, managing a lengthy review, and pricing all testing and compliance obligations.
For a manufacturer evaluating whether a specific NSN is worth pursuing, the right first question is not simply, "Can we make this part?" The better questions are:
- Is there enough recurring demand to justify the investment?
- Can we lawfully obtain or develop the required technical data?
- Do we have relevant DoD manufacturing history and past performance?
- Can our quality system support the item?
- What tooling, FAT, packaging, marking, IUID, and testing costs will apply?
- Which DLA command and ESA control the review?
- Is SBIR, STTR, RPPOB, or another government mechanism available to reduce the cost or risk?
A well-selected SAR opportunity can turn a closed NSN into a competitive market. A poorly selected or incomplete submission can consume significant time and money without producing approval. The difference is disciplined opportunity qualification followed by precise technical and administrative execution.
Consolidated Sources
- Defense Logistics Agency, Source Approval Request (SAR) and Alternate Offer (AO) Guide, November 2022 — DLA
- Government Accountability Office, Defense Inventory: DLA Needs to Expand Efforts to More Effectively Manage Spare Parts, GAO-10-469 — GAO
- Government Accountability Office, Air Force Breakout Efforts Are Ineffective, PLRD-83-82, 1983 — GAO archive
- Federal News Network, IG: 4,400 Percent Profit Margins Show Need for Reform in DoD Spare Parts Market, 2019 — Federal News Network
- Project On Government Oversight, Spare Parts Contractor Profits from Broken System, 2021 — POGO
- Project On Government Oversight, Leaked Audit: Boeing Overcharged Army Up to 177,000 Percent on Helicopter Spare Parts — POGO
- Department of Defense Inspector General, press release regarding Audit of C-17 Spare Parts Pricing, Report No. DODIG-2025-009, October 25, 2024 — DoD OIG
- Bloomberg, Sikorsky Charges U.S. Army $2,393 for $181 Black Hawk Part, 2011 — Bloomberg
- Project On Government Oversight, The Unredacted Truth About Spare Parts Overcharges — POGO
- DLA Aviation, New Source Contract Step-by-Step, Replenishment Parts Purchase or Borrow program — DLA
- Defense Logistics Acquisition Directive 9.304, exceptions to First Article Testing requirements — Acquisition.gov
- DLA Aviation, Source Approval Request Process, 2019 Industry Days briefing — DLA
- DLA Land & Maritime, Value Engineering SAR Briefing — DLA
- Government Accountability Office, Spare Parts Contracts: Collecting Additional Information Could Help DOD Address Delays, GAO-21-388 — GAO
- Office of the Under Secretary of Defense for Acquisition and Sustainment, IUID Working Groups and Frequently Asked Questions — OUSD A&S
- Government Accountability Office, Defense Logistics Agency: Small Businesses Participate in Reverse Engineering of Spare Parts, GAO-19-586 — GAO
- Defense Logistics Agency, 23.3 Small Business Innovation Research Announcement — DLA
- Defense Logistics Agency, DLA Awards First Competitive Contract for Additive Manufacturing, November 2024 — DLA
Disclaimer: This article is for general informational purposes only and does not constitute legal, financial, or business advice. It should not be relied upon as a substitute for consultation with a licensed attorney, accountant, or qualified government-contracts professional regarding a specific Source Approval Request, technical-data rights, or DLA submission. DLA processes, timelines, AMSC codes, and dollar figures discussed here reflect publicly available government guidance and reporting as of July 2026. DLA procedures, points of contact, and requirements are subject to change without notice, and readers should verify current requirements directly with DLA before submitting a SAR. Nothing in this article guarantees source approval, contract award, or any particular financial outcome. Pricing and profit figures cited from DoD Inspector General and GAO reports describe specific past cases and are not general or expected results.
© 2026 GovPath Strategies LLC. All rights reserved. This copyright covers the original writing, analysis, and structure of this article. The underlying facts, figures, and government publications cited and linked throughout are public record and are not owned by GovPath Strategies LLC or anyone else.