New OEM, PMA or used-serviceable material — which should I source for this repair, and what's the airworthiness trade-off?

For most replaceable parts you have three legitimate sourcing routes: new OEM (the original equipment manufacturer's part), PMA (a part built by a holder of a Parts Manufacturer Approval), or USM (used serviceable…

For most replaceable parts you have three legitimate sourcing routes: new OEM (the original equipment manufacturer's part), PMA (a part built by a holder of a Parts Manufacturer Approval), or USM (used serviceable material — a part removed from another aircraft and re-certified). All three can be airworthy. The right choice is a balance of cost, lead time, airworthiness paperwork and acceptance by your regulator, lessor and customers. This brief compares the three on those axes so you can choose per part rather than by habit.

Looking for the definition of a PMA part and the FAA approval basis? That is covered separately. This brief is the sourcing-decision comparison.

The three routes at a glance

	New OEM	PMA	USM (used serviceable)
What it is	The original maker's new part	A new part made under an independent Parts Manufacturer Approval	A used part removed and re-certified to serviceable condition
Typical price vs OEM new	Baseline (highest)	Commonly 25–50% lower, sometimes more	Variable; often a large saving on high-value rotables
Lead time	Can be long for in-demand parts	Often shorter	Depends on market availability
Airworthiness paperwork	OEM CofC / 8130-3 / EASA Form 1	PMA marking + 8130-3 / Form 1	Teardown report + 8130-3 / EASA Form 1, full back-to-birth where required
Main acceptance friction	None	Lessor / OEM-warranty / some customer restrictions	Traceability completeness; lessor & airline policy

New OEM — the default, not always the answer

New OEM parts carry the original design authority's pedigree and the cleanest acceptance story: no lessor or customer is going to object to a genuine OEM part with proper release paperwork. The downsides are price (it is the baseline everything else undercuts) and, for popular components, lead time — exactly the constraint that bites hardest in an AOG event.

Choose new OEM when the part is flight-critical with no mature alternative, when a lease or warranty agreement mandates OEM, or when the cost gap to alternatives is small enough that the clean paperwork is worth it.

PMA — approved alternative, watch the acceptance clauses

A PMA part is a new part produced by a company holding a Parts Manufacturer Approval — it is not a copy in the pejorative sense; it is held to the same airworthiness standards as the OEM equivalent and is fully authorised for use in certified aircraft. Reported savings are commonly in the 25–50% range versus OEM, with shorter lead times, and in some cases design refinements that resolve a known OEM weakness.

The real-world caution with PMA is commercial acceptance, not airworthiness: leasing agreements, OEM warranty terms, or specific airline/MRO policies sometimes restrict PMA on certain parts or while an asset is under lease. Always check the lease return conditions and warranty before committing a PMA part to a leased airframe.

Choose PMA when an approved alternative exists for a non-critical or well-proven part, the saving is material, and no lease/warranty/customer clause prohibits it.

USM — biggest savings on rotables, paperwork is everything

USM is a serviceable part recovered from another aircraft — frequently from aircraft teardowns — inspected and re-certified by a Part-145 / repair-station process and released on the appropriate airworthiness tag. It can deliver the largest savings on high-value rotables, where buying new OEM is expensive and lead times are long, which is why many operators now build USM into their maintenance plans to drive cost down.

USM lives and dies on traceability and authenticity. Regulators, lessors and buyers expect:

A dual release where applicable — under the EU/US bilateral, a used article being exported/imported should carry dual release on FAA Form 8130-3 and EASA Form 1.
A teardown report that captures the work performed plus applicable Service Bulletins, modification status and Airworthiness Directives with revision number and date.
Back-to-birth records where the part is life-limited — traceability of remaining life is non-negotiable for LLPs.

The risk with USM is not that it is unsafe when properly documented — it is that incomplete paperwork can make a physically good part commercially unusable or unacceptable to a lessor on return. Surging aircraft retirements have increased USM supply but also stretched traceability discipline across the market.

Choose USM when the part is a high-value rotable, the documentation is complete and verifiable, and remaining life (for LLPs) meets your need. Walk away from any USM with traceability gaps regardless of price.

A simple decision flow

Is the part life-limited or flight-critical with no mature alternative? → New OEM, unless a fully traceable USM with adequate remaining life is available and accepted.
Is there a lease, warranty or customer clause restricting alternatives? → Source within that clause (often forces OEM).
Is a proven PMA available and the saving material? → PMA, after checking acceptance clauses.
Is it a high-value rotable with complete back-to-birth USM available? → USM for the largest saving.
Otherwise → whichever of new OEM / PMA gives the best cost-and-lead-time balance with clean paperwork.

GCC note

Gulf carriers and the lessors financing their fleets tend to apply strict return-condition and traceability standards, and a large share of regional widebody fleets sit on operating leases. That makes the acceptance column above as decisive as price: confirm lease return conditions before committing PMA or USM to a leased aircraft, and insist on dual-release paperwork for any USM crossing borders.