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DOD sole-source spare-parts cost-data exemption (Truthful Cost or Pricing Data statute / TINA)

DOD cleared TransDigm's prices as fair without ever seeing its costs

Summary

Federal contracting law lets the Pentagon skip requiring certified cost data when a part is sold on a sole-source basis but classified as "commercial," or when the contract falls below a dollar threshold -- on the assumption that other pricing checks, like comparing prices to past purchases, are good enough substitutes. A May 2021 GAO report found the Defense Logistics Agency used exactly that shortcut on 77 of 136 sole-source spare-parts contracts worth $7.9 billion. A December 2021 Defense Department Inspector General audit tested the assumption directly on TransDigm, a monopoly aircraft-parts supplier: DLA asked TransDigm for cost data on 26 spare parts and got it for 2. The Inspector General asked too, using its own audit authority, got the data for nearly all of its 153-contract sample, and found $20.8 million in excess profit sitting inside contracts DOD's own pricing process had already called fair and reasonable.

By Marcus Aurelius · July 12, 2026

When the Pentagon buys spare parts without competition, the law is supposed to require the contractor's certified cost data before the government pays -- unless the part counts as "commercial," or the contract falls under a dollar threshold, in which case contracting officers are told other pricing checks will do. A May 2021 GAO report found the Defense Logistics Agency () used that shortcut on 77 of 136 sole-source spare-parts contracts awarded from fiscal years 2015 to 2019, worth $7.9 billion combined. A December 2021 Defense Department Inspector General audit put that assumption to an actual test on TransDigm, a monopoly aircraft-parts supplier: contracting officers asked TransDigm directly for cost data on 26 spare parts and received it for 2. The Inspector General then asked too, obtained data for nearly its entire 153-contract sample using its own audit authority, and found $20.8 million in excess profit inside pricing the government had already signed off on as fair and reasonable.

The assumption: other pricing checks are good enough

Federal law -- the Truthful Cost or Pricing Data statute, often still called TINA after its predecessor, the Truth in Negotiations Act -- requires contractors to submit certified cost or pricing data on sole-source contracts above a dollar threshold, so contracting officers can verify a price is fair before agreeing to pay it. But the same statute carves out an exception for commercial items, on the theory that market forces already discipline commercial prices, and policy lets contracting officers substitute other data -- like historical prices or sales invoices -- when certified data isn't required. found applied the commercial-item exception to 77 of its 136 sole-source spare-parts contracts from fiscal years 2015 to 2019, exempting the contractor from certified cost data entirely. Of the remaining 59, obtained certified data in 57 cases; for 2 more, worth $36.6 million and $1.9 million, 's own contracting authority waived the requirement, citing exceptional need for the parts.

More than half of DLA's sole-source spare-parts contracts skipped certified cost data entirely
How DLA determined price reasonableness on its 136 sole-source spare-parts contracts, fiscal years 2015-2019
Commercial-item exemption (data other than certified)
77
Head-of-Contracting-Activity waiver (data other than certified)
2
Certified cost or pricing data obtained
57
Source: GAO-21-388, Figure 1
View data as table
DLA sole-source spare-parts contracts above the Truthful Cost or Pricing Data threshold, by type of pricing data obtained, FY2015-2019
Commercial-item exemption (data other than certified)77
Head-of-Contracting-Activity waiver (data other than certified)2
Certified cost or pricing data obtained57

The theory behind the commercial-item exception assumes something the sole-source setting itself contradicts: that there's a competitive market disciplining the price. 's own case studies from fiscal year 2019 show what happens instead. In a $157.7 million contract for a helicopter engine out of production for 30 years, it took 459 days to get the certified cost data it needed -- and once it did, the price came down 25 percent from the contractor's original ask. In a $4.3 million bomb-rack-parts contract, the Air Force couldn't get an adequate proposal for over 450 days and, facing a grounded aircraft, ultimately paid 5 percent more than the contractor had proposed. Delays factored into 7 of the 10 contracts reviewed as case studies, ranging from 149 to 1,154 days between solicitation and award -- and 's own tracking system doesn't count delays at all, only outright refusals, so nobody at the Pentagon has a department-wide count of how often this happens.

The same case that took 149 days to award, took 1,154 days for a different part
Days from solicitation to award for 10 sole-source spare-parts contracts GAO reviewed, fiscal year 2019
Aircraft auto-flight parts (DLA)
1,154
Bomb rack parts (Air Force)
922
Aircraft engine parts (DLA)
497
Aircraft engine parts (DLA)
459
Power supplies (DLA)
392
Aircraft brake parts (DLA)
282
Missile electrical equipment (Air Force)
274
Engine parts (Navy)
265
Aircraft wheel and brake parts (Air Force)
155
Aircraft engine parts (DLA)
149
Source: GAO-21-388, Figure 2
View data as table
Number of days between solicitation and contract award for 10 selected sole-source spare-parts contracts, FY2019
Aircraft auto-flight parts (DLA)1,154
Bomb rack parts (Air Force)922
Aircraft engine parts (DLA)497
Aircraft engine parts (DLA)459
Power supplies (DLA)392
Aircraft brake parts (DLA)282
Missile electrical equipment (Air Force)274
Engine parts (Navy)265
Aircraft wheel and brake parts (Air Force)155
Aircraft engine parts (DLA)149

The test: what happens when someone actually asks

TransDigm is the sharpest version of the same setup: a company built by acquiring monopoly suppliers of highly engineered, sole-source aircraft parts, more than 95 percent of whose $268.2 million in contracts from January 2017 to June 2019 fell below the certified-cost-data threshold entirely. When contracting officers asked TransDigm directly for uncertified cost data -- the fallback checking mechanism the law does provide for -- they got it for 2 of the 26 spare parts they asked about. For the other 24, nothing in the law compelled TransDigm to comply, and contracting officers were left to rely on the same historical-price comparisons the commercial-item exception assumes are sufficient.

Asked directly for cost data on 26 spare parts, TransDigm handed over 2
TransDigm's response when DLA contracting officers requested uncertified cost data, per DOD IG's audit sample
Provided the requested uncertified cost data
2
Did not provide the requested data
24
Source: DODIG-2022-043
View data as table
Outcome of DLA contracting officers' requests for uncertified cost data on 26 TransDigm spare parts (27 contracts)
Provided the requested uncertified cost data2
Did not provide the requested data24

The Inspector General ran the test couldn't. Using its own audit authority rather than a contracting officer's request, it obtained uncertified cost data from TransDigm for 152 of the 153 contracts in its sample -- and once it had real cost data to compare against actual prices paid, it found TransDigm had earned at least $20.8 million in excess profit across 105 spare parts and 150 contracts. That's money embedded in exactly the kind of below-threshold, commercial-item, price-analysis-only contracts the statute assumes don't need closer scrutiny. The Inspector General recommended seek a voluntary refund of the full $20.8 million and review whether current policy requires enough cost analysis on sole-source parts outside TINA's reach -- but made no new policy recommendation beyond what a February 2019 report on other TransDigm purchases had already proposed, because those recommendations were still open.

Of DLA's 136 sole-source spare-parts contracts (FY2015-2019, worth $7.9 billion total), the share exempted from certified cost data because the contractor claimed the part was a 'commercial item'
77 of 136
the commercial-item exemption applies regardless of whether real market competition exists for the part -- the exact condition that lets a monopoly supplier withhold the data that would let DOD check its price
Spare parts for which TransDigm did not turn over uncertified cost data after DLA contracting officers directly requested it, of the 26 parts requested
24 of 26
nothing in the law compelled TransDigm to comply -- the Inspector General had to request the same data itself, using its own audit authority, to get it
Excess profit DOD's Inspector General found once it obtained the cost data TransDigm had refused to give DLA, across 105 spare parts and 150 contracts
$20.8M
found on contracts covering a fraction of the $268.2 million in below-threshold TransDigm business the audit examined -- business that DOD's own price-reasonableness process had already signed off on as fair

What's left once the assumption is tested

Nothing about this is a one-time discovery. The Inspector General's report cites "multiple audit reports over the past 23 years" finding the same pattern -- paying excess profits on sole-source contracts where cost analysis wasn't used. After the 2019 TransDigm findings, the Pentagon's own pricing office proposed two legislative fixes for the 2021 defense authorization bill: one to strengthen commercial-item-determination authority, another to require uncertified cost data when a contractor's price data otherwise falls short. Neither made it into the final law. As of this report, was considering trying again in the fiscal year 2023 legislative cycle. 's single recommendation -- that the Pentagon at least start tracking how often and why these delays happen -- is a lower bar than fixing the underlying exemption, and concurred with it without committing to close the gap the exemption itself creates.

The takeaway

  • The assumption carrying the whole system is that price analysis without cost data can substitute for it. found relied on that substitute for 79 of 136 sole-source spare-parts contracts (77 commercial-item exemptions plus 2 waivers) worth a large share of $7.9 billion -- exactly the contracts where, by definition, no competing bid exists to check the price against.
  • When 's own contracting officers tried to run the fallback check the law provides -- simply asking the contractor for cost data -- the assumption didn't survive contact with a monopoly supplier. TransDigm handed over what was requested for 2 of 26 spare parts and withheld it for the rest; nothing in the statute gave the power to compel it.
  • What was left once someone with the authority to compel disclosure actually ran the test: $20.8 million in excess profit, on contracts already cleared as fair and reasonable. The Inspector General's audit authority succeeded where a contracting officer's request failed, and the money it found had been sitting inside a pricing process that, by design, never has to look.

Systemic findings on 's sole-source spare-parts contracting are from -21-388, 'Spare Parts Contracts: Collecting Additional Information Could Help Address Delays in Obtaining Cost or Pricing Data' (May 26, 2021), read directly and in full. TransDigm-specific findings are from DODIG-2022-043, 'Audit of the Business Model for TransDigm Group Inc. and Its Impact on Department of Defense Spare Parts Pricing' (December 13, 2021), read directly and in full from the official report summary published on dodig.mil. 's report predates DODIG-2022-043 and could not have cited it; it instead cites an earlier, February 2019 Inspector General review of other TransDigm purchases (DODIG-2019-060). The two reports in this piece examine overlapping but distinct samples -- 's 136-contract, five-year -wide review and the Inspector General's 153-contract, TransDigm-specific sample -- and were not cross-referenced by their authors; no figure from one report is presented as confirming a figure in the other.

Sources(2) ▾
  • U.S. Government Accountability Office, Spare Parts Contracts: Collecting Additional Information Could Help DOD Address Delays in Obtaining Cost or Pricing Data (2021-05-26)-21-388, a report to congressional committees. Read in full directly from the PDF via the Wayback mirror (direct gao.gov blocked scripted fetches with HTTP 403). gao.gov · original document
  • U.S. Department of Defense (now Department of War) Office of Inspector General, Audit of the Business Model for TransDigm Group Inc. and Its Impact on Department of Defense Spare Parts Pricing (DODIG-2022-043) (2021-12-13)DODIG-2022-043 official report summary page (What We Did / What We Found / What We Recommend), read in full directly via the Wayback mirror (direct dodig.mil blocked scripted fetches with HTTP 403; the underlying PDF is also blocked and has no archived capture). dodig.mil · original document
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