Boeing advertised it was creating another higher limit form of the quick offering 737-300 in June 1986.
The new plane, the 737-400, was produced as a 150 seat class 727 substitution. Albeit Boeing had at first created the 180 to 200 seat 757 to supplant the effective 727, there still existed a significant business for a close coordinate size substitution for the mainstream trijet. By creating the 737-400 as a base change stretch of the 737-300, Boeing was likewise equipped to offer respectable shared trait, and therefore cost, profits to administrators as of now with the 737-300, and to a lesser degree, the 737-200 in their armadas.
The significant change of the 737-400 over the more diminutive 300 is a 3.05m (10ft 0in) fuselage stretch, comprising of a 1.83m (6ft 0in) stretch forward and a 1.22m (4ft 0in) fitting back of the wing. The stretch builds most extreme traveler seating to 188. To adapt to the expanded weights, all the more compelling Cfm56s are fitted. Different progressions are minor, for example, a tail guard fitted to ensure against over revolution at takeoff, something that could have turned into an issue because of the expanded fuselage length.
A higher terrible weight longer go form is advertised. It gimmicks expanded fuel limit, and reinforced undercarriage and structures, however is generally indistinguishable to the standard 737-400.
The principal flight of the 737-400 happened on February 19 1988 and it entered carrier benefit in October that year with Piedmont. Of the 737-300/ -400/ -500 family the 400 has demonstrated the best part behind the 300, its bigger limit and transcontinental US run significance it has discovered an extremely valuable business for Boeing as a 727 substitution. However the 737-400 does face firm rivalry from the comparable size Airbus A320, which has more elevated amounts of innovation, longer go and is quicker (yet is additionally heavier).
Pictures of Boeing 737-400