Used-serviceable vs. overhauled — what to ask before you buy
Same part. Different price by 3x. The terms aren't synonyms — and the wrong one will get you a discrepancy.
The four work types you'll see
New (NE): Manufactured to specification, never installed. Sealed box, original packaging, OEM trace. Highest price, no questions.
Overhauled (OH): Tested, disassembled, inspected, all wear items replaced, reassembled to original specs, and re-certified. Time-since-overhaul (TSO) resets to zero. Issued with 8130-3 showing 'Overhauled' status.
Repaired (RP): Returned to airworthy condition by replacing or repairing components, but not a full teardown. Cheaper than overhaul, shorter expected life.
Inspected/Tested (IN) — aka 'as-removed' or 'used-serviceable' (US): Removed from a serviceable aircraft, inspected, function-tested, but not torn down. Trace documents show prior history (hours, cycles, removal reason).
When used-serviceable makes sense
Used-serviceable parts come with full trace and an 8130-3 from the removing organization. They're typically 40-70% of overhauled price.
They work well for: - Replacement of a part that's about to time-out anyway — you're buying remaining life cheap - Components with long fatigue lives where mid-life parts are still 80%+ of original lifespan - AOG situations where install-now matters more than maximum service life - Parts where overhaul cost > new cost (some avionics LRUs)
They don't work for: - Parts where the overhaul resets a critical wear path (turbine blades, certain bearings) - AD-driven replacements where the AD requires new or specific overhaul certification - Components installed in critical-flight systems where uncertainty over remaining life is a liability
The four questions to ask every used-serviceable seller
1. What were the total hours and cycles at removal? If they can't say, the part doesn't have full trace. Walk away.
2. Why was it removed? 'Aircraft scrapped' or 'engine HSI replacement' is fine. 'Performance complaint' is a yellow flag — ask for the maintenance discrepancy that triggered removal.
3. What organization issued the 8130-3? Cross-reference the cert number at FAA.gov. Repair stations with active certs are safer than freelance signatures.
4. Can you share the maintenance history before removal? A serious vendor will share log entries. A reluctant vendor is hiding something.
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