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HSChapter 84
U.S. imports of parts for aircraft spark-ignition, rotary & compression-ignition piston engines (HS 840910) totaled $10.9M in July 2026, traded with 42 countries.
Importers of Parts for Aircraft Spark-Ignition, Rotary & Compression-Ignition Piston Engines paid $196K in duties in July 2026 — an effective duty rate of 10% on $1.9M in dutiable value, based on actual customs collections rather than the published tariff schedule. Parts for Aircraft Spark-Ignition, Rotary & Compression-Ignition Piston Engines imports of $10.9M in July 2026 ran 13% below the year-to-date monthly average of $12.5M.
Last updated: July 2026 dataDedicated to engine components destined for aircraft powerplants, this heading splits at the 10-digit level between civil aviation use (8409100040) and non-civil aircraft applications (8409100080) — a distinction that drives both duty treatment and FAA regulatory requirements. Parts entering civil aircraft maintenance supply chains must meet FAA airworthiness standards, and importers often rely on FAA Form 8130-3 or equivalent bilateral aviation authority documentation. Japan, Italy, and Canada are the leading US suppliers under this heading, with Canada's proximity and USMCA eligibility making it a particularly efficient source for MRO operations.
AI-written summary of the official U.S. Census Bureau trade figures on this page — verify before relying on it.
346 shipments/mo
Parts for civil aircraft engines generally require an FAA Form 8130-3 (Airworthiness Approval Tag) or equivalent documentation from a recognized bilateral aviation safety agreement (BASA) partner authority. Importers should also verify that the manufacturer holds the appropriate FAA Production Approval or that the parts qualify as standard parts per FAA definitions.
The civil/non-civil split (8409100040 vs. 8409100080) affects both the applicable duty rate and the regulatory pathway. Civil aircraft parts may qualify for duty-free treatment under the Civil Aircraft Agreement (GATT), while non-civil (e.g., military) aircraft parts follow a different tariff treatment and may be subject to export/import licensing requirements.
Subheading 3 of 3 in heading 8409
Subheading 840910 · $10.9M of $1.1B
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ImportsExports
Imports
$10.9MYoY · Pro
Exports
$3.7MYoY · Pro
12-mo low · imports
YoY · ProThrough July 2026. Source: U.S. Census Bureau.
HS10 import codes under this HS6 parent, each with its own page. Source: U.S. Harmonized Tariff Schedule.
| Code | Description | Import Value | Effective Tariff % | Dutiable Share | Duty Collected |
|---|---|---|---|---|---|
| 8409100040 | Parts for Spark-Ig or Comp-Ig Pst Eng for Civ A/C | $9.0M | 1.17% | 11.36% | $105K |
| 8409100080 | Parts for Sp-Ig or Comp-Ig for Use in A/C Ex Civil | $1.9M | 4.79% | 46.57% | $91K |
HS10 export codes under this HS6 parent, each with its own page. Source: U.S. Schedule B export classification.
| Code | Description | Export Value |
|---|---|---|
| 8409100080 | Parts for Sp-Ig or Comp-Ig for Use in A/C Ex Civil | $3.7M |
Import lines come from the U.S. Harmonized Tariff Schedule and export lines from Schedule B. The two are numbered by different agencies, so the same 10-digit code can appear in both tables describing a different product.
Imports · July 2026
origin
Japan and United Kingdom together supply 55% of it.
customs district
destination
entry
rate provision · imports
82.5% enters free of duty; the effective duty rate is 1.80%.