Boeing 737-400
The Boeing 737-400 is a member of the Boeing 737 Classic series (-300/-400/-500), developed as a stretched variant of the 737-300 to accommodate higher passenger capacities. It remains one of the most widely operated variants in the 737 family, known for its reliability and efficiency in medium-haul routes.
Technical Specifications
- Manufacturer: Boeing
- Series: 737 Classic
- First Flight: 1988
- Engine Options: CFM56-3 or Pratt & Whitney JT8D (later models)
- Capacity: Typically 140–168 passengers (depending on configuration)
- Range: ~2,940 nmi (5,450 km)
- Status: Production ended in 2000; many still in active service or converted to freighters.
Operational History & Significance
- Designed to bridge the gap between the 737-300 and larger wide-body aircraft.
- Dominated regional and domestic markets in North America, Europe, and Asia during the 1990s and 2000s.
- Frequently retrofitted with CFM56 engines for improved fuel efficiency and noise reduction.
Notable Incidents
- USAir Flight 5050: LaGuardia Incident Exposes Critical Crew and CRM Failures: On September 20, 1989, a 737-400 operated by USAir encountered critical crew resource management (CRM) failures during departure from LaGuardia Airport, highlighting systemic issues in pilot coordination and situational awareness. This incident is frequently cited in aviation safety training regarding CRM breakdowns and runway incursions.
Legacy
- The -400 variant set standards for single-aisle jet economics, influencing subsequent Boeing 737 NG and Boeing 737 MAX designs.
- Many airframes have been converted to freighters or extended service life via advanced avionics upgrades.