Engine Overview
The CFM56-3C1 is the highest-rated major CFM56-3 variant and can be used across Boeing 737-300, 737-400 and 737-500 applications.
| Engine Family | CFM56-3 |
|---|---|
| Variant | CFM56-3C1 |
| Takeoff Thrust | Up to approx. 23,500 lbf |
| Fan Diameter | Approx. 60 in |
| Applications | 737-300 / -400 / -500 |
| Market | Mature / legacy narrowbody |
Variants & Aircraft Applications
Commercial application and configuration vary by engine rating and aircraft model.
| Engine Variant | Primary Application |
|---|---|
| CFM56-3C1 | Boeing 737-300 |
| CFM56-3C1 | Boeing 737-400 |
| CFM56-3C1 | Boeing 737-500 |
Final applicability must be verified against current approved aircraft and engine documentation.
Global Fleet Footprint
CFM reports 256 operators for the overall CFM56-3 fleet as of April 2026, with nearly 230 million engine flight hours and more than 162 million cycles.
Fleet/operator counts evolve; use current OEM and operator records for transaction-level verification.
Representative CFM56-3C1 LLP P/Ns
| Module | P/N | Description |
|---|---|---|
| Fan/LPC | 335-009-306-0 | Booster Spool |
| Fan/LPC | 335-014-511-0 | Fan Disk |
| Fan/LPC | 335-006-414-0 | Fan Shaft |
| HPC | 1275M37P02 | HPC Front Shaft |
| HPC | 1589M66G02 | HPC Stage 1-2 Spool |
| HPT | 1475M29P03 | HPT Rotor Disk |
| LPT | 301-331-125-0 | LPT Stage 1 Disk |
Reference only. LLP applicability and certified life are configuration/revision specific and must be verified against current approved records.
Maintenance & Shop-Visit Planning
| Performance | Monitor EGT margin, oil consumption, vibration and borescope findings. |
|---|---|
| LLP planning | Category-specific life limits can materially change remaining-life calculations. |
| Engine economics | Green-time replacement may compete with heavy shop-visit investment on mature assets. |
| Workscope | Core, fan/booster and LPT work are often scheduled independently according to condition. |
There is no single universal overhaul interval applicable to every engine in this family.
Indicative Shop-Visit Cost Context
Current economics are highly asset-specific. Historical references show CFM56-3 shop visits ranging from targeted sub-million-dollar work to much heavier events; major LLP replacement can add substantial cost. Current engine value should always be compared with planned workscope.
| Main drivers | Workscope, LLP status, hot-section material, repairability, USM availability, labor, shop capacity and engine configuration. |
|---|---|
| Commercial check | Compare planned shop-visit investment with current engine and green-time replacement value. |
Budgetary context only; not a CFM Gate quotation.
Commonly Sourced CFM56-3C1 Material
Typical CFM56-3C sourcing demand includes fan disk/shaft/booster LLPs, HPC and HPT rotating hardware, LPT disks and shafts, hot-section material, fuel and oil accessories and traceable serviceable rotables.
CFM Gate's RFQ/OFFER database is not yet reliably tagged by engine family, so this page does not publish an artificial “top P/N” ranking.
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