LEAP-1B
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Technical Specifications
- Thrust
- 130,0 kN (29 317 lbf)
- Bypass Ratio
- 9,0:1
- Fan Diameter
- 1,763 m
- Pressure Ratio
- 40,0:1
- SFC
- 0,2760 lb/lbf·h
- Dry Weight
- 2 780 kg
- Length
- 3,154 m
- First Run
- 2014
- In Service
- 2017
Descripción general
The LEAP-1B es la única planta motriz para la familia Boeing 737 MAX, compartiendo la misma tecnología de núcleo avanzada que el LEAP-1A pero adaptada a las restricciones dimensionales del 737. La famosa baja distancia al suelo del 737 — un legado del diseño original de los años 1960 with its underwing main landing gear — obligó a los ingenieros de CFM a reducir el diámetro del fan to 69.4 inches (1.763 m) compared to 78 inches on the LEAP-1A, y a posicionar los accesorios del motor en la parte superior y los laterales de la góndola en lugar de debajo. The resulting bypass ratio of 9:1 is lower than the LEAP-1A's 11:1, yet the LEAP-1B aún ofrece aproximadamente 14% mejor consumo de combustible que el CFM56-7B al que reemplaza.
The LEAP-1B shares the same CMC high-pressure turbine shrouds, 3D-woven composite fan blades (18 blades), TAPS II combustor, and additive-manufactured fuel nozzles as its sibling variants. Boeing seleccionó LEAP-1B como motor exclusivo para el 737 MAX, a diferencia del A320neo que ofrece una elección entre LEAP-1A and the Pratt & Whitney GTF. Este acuerdo de fuente única creó un riesgo operativo significativo cuando el 737 MAX fue suspendido a nivel mundial from March 2019 to November 2020 tras dos accidentes fatales vinculados al sistema de control de vuelo MCAS — un problema de software y diseño no relacionado con los motores.
Especificaciones técnicas
| Parámetro | Valor |
|---|---|
| Empuje máximo | 130.0 kN (29,317 lbf) |
| Relación de derivación | 9.0:1 |
| Diámetro del fan | 1.763 m (69.4 in) |
| Peso en seco | 2,780 kg (6,129 lb) |
| Longitud | 3.154 m (124.2 in) |
| Relación de presión total | 40.0:1 |
| SFC | 0.276 lb/lbf·h |
| Primera prueba | 2014 |
| Entrada en servicio | 2017 |
Variantes
LEAP-1B variants cover the full 737 MAX thrust range. The LEAP-1B27 (27,000 lbf) powers the 737 MAX 7, while the LEAP-1B28 (28,000 lbf) is the standard for the 737 MAX 8 and LEAP-1B28E1 covers the MAX 8-200 high-density variant. The LEAP-1B28BBJ1 serves the Business Jet derivative. The LEAP-1B28/B1 (up to 29,317 lbf) powers the larger 737 MAX 9 and MAX 10. All variants share common line replaceable units (LRUs) and maintenance procedures, minimizing fleet complexity for 737 MAX operators.
Aplicaciones en aeronaves
- Boeing 737 MAX 7: LEAP-1B27 (27,000 lbf) — variante MAX más pequeña
- Boeing 737 MAX 8: LEAP-1B28 (28,000 lbf) — variante MAX de mayor volumen
- Boeing 737 MAX 9: LEAP-1B28B1 (29,317 lbf) — MAX alargado
- Boeing 737 MAX 10: LEAP-1B28B1 (29,317 lbf) — el 737 más largo jamás construido
Historia del desarrollo
Development of the LEAP-1B began formally when Boeing launched the 737 MAX program in August 2011. The first LEAP-1B engine run took place in June 2014, with FAA certification achieved in May 2016. The 737 MAX 8 entered revenue service with Malindo Air in May 2017. Following the two fatal crashes (Lion Air 610 in October 2018 and Ethiopian Airlines 302 in March 2019), the 737 MAX fleet was grounded globally. LEAP-1B engines accumulated significant time during the 20-month grounding with engines stored on the aircraft or in warehouses, requiring re-certification of airworthiness upon return to service. The MAX returned to service in the US in December 2020. By 2024, LEAP-1B had powered the 737 MAX family to over 30 million flight hours. Introduction of the 737 MAX 10 in 2023 represented the highest-thrust application of the LEAP-1B platform.