Engine Overview
The CFM56-7B is the exclusive engine for the Boeing 737 Next-Generation family.
| Engine Family | CFM56-7B |
|---|---|
| Type | High-bypass turbofan |
| Takeoff Thrust | Up to approx. 27,300 lbf |
| Fan Diameter | 61 in |
| Core | 9-stage HPC / 1-stage HPT |
| Applications | Boeing 737NG / BBJ |
Variants & Aircraft Applications
Commercial application and configuration vary by engine rating and aircraft model.
| Engine Variant | Primary Application |
|---|---|
| CFM56-7B18 / -7B20 | Lower-thrust 737NG applications |
| CFM56-7B22 / -7B24 | Mid-range 737NG applications |
| CFM56-7B26 / -7B27 | High-demand 737-800/-900-family applications |
Final applicability must be verified against current approved aircraft and engine documentation.
Global Fleet Footprint
As of April 2026, CFM reports 252 operators, more than 610 million engine flight hours and over 314 million cycles for the CFM56-7B fleet.
Fleet/operator counts evolve; use current OEM and operator records for transaction-level verification.
Representative CFM56-7B LLP P/Ns
| Module | P/N | Description |
|---|---|---|
| Fan/LPC | 340-000-420-0 | Fan Disk |
| Fan/LPC | 340-000-816-0 | Booster Spool |
| Fan/LPC | 335-006-414-0 | Fan Shaft |
| HPC | 1386M56P03 | HPC Front Shaft |
| HPC | 1558M31G04 / G07 | HPC Stage 1-2 Spool |
| HPT | 1498M43P06 | HPT Rotor Disk |
| LPT | 336-001-804-0 | 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 | Track EGT margin, oil consumption, vibration, fuel burn and trend data. |
|---|---|
| Inspections | Use approved maintenance data, borescope findings and AD/SB status. |
| LLP planning | Remaining cycles strongly influence shop-visit timing and engine value. |
| Workscope | Quick-turn, module work, performance restoration or heavier overhaul depending on findings. |
There is no single universal overhaul interval applicable to every engine in this family.
Indicative Shop-Visit Cost Context
Current public 2026 market references place many CFM56-7B performance-restoration events broadly around USD 2.0M–4.5M, with major LLP replacement potentially adding several million dollars.
| 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 CFM56-7B Material
Typical high-demand CFM56-7B sourcing categories include fan and booster material, HPC/HPT/LPT rotating hardware, HPT blades and nozzles, bearings, fuel and oil-system accessories, pumps, valves, starters and traceable 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.
Need CFM56-7B Engines or Parts?
Send your requirement and our team will review current sourcing options.