Boeing decided to capitalize on the success of its new airliner and created a whole family of aircraft with varying flight ranges and payloads to meet any potential customer needs. The first appeared 737-400 – an elongated version with greater capacity with a slight reduction in flight range. This option was first announced in June 1986, and the first aircraft took off on February 19, 1988.
The Boeing 737-400 had a 1.83-meter insert in front and a 1.22-meter insert behind the wing and was equipped with more powerful engines CFM56-3B-2 (traction 97.86 kN) or CFM56-3C (104.5 kN). Increased to 68039 kg maximum take-off weight forced designers to strengthen the chassis and the outer panels of the wing consoles. The basic version of the 737-400 was a mixed-layout airliner with 146 seats, although charter airlines used salons with 170 seats. The FAA certificate was obtained on September 2, 1988 – for an aircraft with a maximum capacity of 188 seats.
The starting customer for the new option was Piedmont Airlines, which received its first liner on September 15, 1988. Subsequently, this company was acquired by the USAir concern, which also became a customer of 737-400.
On March 31, 1994, 224 orders were received, 84 liners – delivered. Some doubts about the safety of the car arose after a British Midland-powered Boeing 737-400 crashed with CFM56-3C engines crashed while trying to make an emergency landing at East Midland Airport, England, but this event was not seriously affected. Soon there was a modification of 737-400 with increased mass (parking weight increased to 68,265 kg) and a fuel reserve, new avionics, as well as reinforced chassis and wing. The power plant included engines of increased power – CFM56-3C-1 with a thrust of 111.2 kN.
Serially produced since 1988, by the beginning of 1997 456 aircraft of this modification were sold, 409 were delivered. As of 2010, 486 Boeing 737-400 aircraft were delivered.
The first customers are US Airways and Pace Airlines. The largest operator is Alaska Airlines with 40 aircraft.
- Modification: Boeing 737-400
- Wingspan, m: 28.88
- The length of the aircraft, m: 36.40
- The height of the aircraft, m: 11.13
- Wing Area, m2: 105.40
- Weight kg: empty loaded aircraft 34270; maximum take-off 68100
- Engine type: 2 turbofan engines CFM International CFM56-ZS1
- Thrust, kg/f: 2 x 10670
- Maximum speed, km / h: 945
- Cruising speed, km / h: 910
- Practical range, km: 5000
- Practical ceiling, m: 11300
- Crew: 2
- Payload: 146 passengers in the cabin of two classes or the tourist class of 168 people or 18800 kg of cargo.