longeron

[′lan·jə‚rän]

(aerospace engineering)

A principal longitudinal member of the structural framework of a fuselage, nacelle, or empennage boom.

longeron

The principal longitudinal members of the fuselage, which run from the front to the rear and are usually supported at various points along the length by other structural members. Also called a stringer.

The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Longeron

a major load-bearing element of many engineering structures, such as aircraft, automobiles, bridges, and ships.

Longerons run lengthwise in a structure; together with stringers, they form the longitudinal frame for the wings, fuselage, empennage, control surfaces, and ailerons in an aircraft. In automobiles and railroad cars, two longerons connected by transverse members form the frame (chassis) that supports the body, wheels, and engine. Longerons may be made of H-shaped, channeled, boxlike, or irregular sections or sheets of metal.

References in periodicals archive

Values of preliminary critical forces of longerons and other thin-walled closed-profile rods can be calculated using the analytical expression suggested by S.

Research into elements of the multifunctional deformation zones of a car body/Automobilio kebulo daugiafunkciu deformaciniu zonu elementu tyrimas

Coming out of the container, each panel consists of a 0.060- to 0.200-inch-thick outer skin, a series of longitudinal stringers, or "longerons," that have been riveted to the outer skin, rows of radial tear strips (which stop the outer skin from ripping in the event it is punctured), and an array of L- and T-shaped shear clips that have been riveted to the longerons.

Here, at the first station, workers temporarily stake J-shaped longerons between the panels.

The frames run perpendicularly to the longerons, and nest up between them.

Long line in Long Beach

This hysteresis was attributed to the splitting of one longeron near the right support plate.

The diameter corresponded to the pitch circle passing through the centers of three longerons. The test boom had a total length of 21.5 feet with 26 bays, each 10 inches long.

Limiting vibration in space lattices

The AD currently requires repetitive inspections to detect cracking of the longeron splice fittings at stringer 11 on the left and right sides at body station 2598, and the replacement of any cracked fittings with a new one.

Federal Aviation Administration advisory

The FAA has also proposed an AD that is applicable to certain Boeing Model 747-400 series aircraft that would require repetitive inspections to detect fatigue cracking of the longeron splice fittings at stringer 11 on the left and right sides at body station 2598, and various follow-on actions.

Federal Aviation Administration Airworthiness Directives

An amendment superseding an existing AD has been issued by the FAA that is applicable to certain Boeing Model 747-100, -200, -300, 747SR and 747SP series aircraft that requires a one-time inspection to detect cracking of the longeron splice fittings at stringer 11 on the left and right sides at body separation 2598, as well as replacement of any cracked fitting with a new one.

US FAA adopts new airworthiness directives