A keelson keel beam is much like a keel on a boat is

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A Keelson (Keel Beam)is much like a keel on a boat. Is designed to carry the fuselage bending loads and is frequently used in fighter design.Stringer- is a relatively light strip of small cross section that runs the length of the fuselage and is attached to outer edge of bulkhead.Longerons-are heavier than stringers but lighter that keelsons.
Keel Beam(Keelson) on B-737-700
Keelson or keel BeamA Keelson is much like a keel on a boat. Is designed to carry the fuselage bending loads and is frequently used in fighter design, but is also found on air transports.L1011 AircraftThe 767 also has a single keel beam running along the centerline below the center wing box and continuing through the landing gear bays.
1 Sept 11,Airbus delivers first A350 XWB centre wing box and keel beam to St NazaireTwo significant milestones in the A350 XWB program occurred this month. On August 8th Airbus delivered the first A350 XWB centre wing box from Airbus’ site in Nantes to its St Nazaire facility for assembly into the first A350 XWB fuselage central section. This was followed on August 12thby the delivery of the first A350 XWB Keel Beam, again from Nantes to St Nazaire.
The right hand main gear touched down outside the runway, about 4 meters off the right edge of the runway. The captain steered the aircraft back to the center line of the runway and brought it to a stop about 100 meters short of taxiway N3. Two passengers received minor injuries (backbone pain), the aircraft received substantial damage including a fractured/bent fuselage.
The aircraft received substantial damage: the fuselage cracked about above the main gear, at about seat row 16 and the wheel well area. The lower keel beam in the wheel well area was damaged due to excessive bending and torsion moments. The aft part of the keel beam was displaced by about 15cm, crushed and twisted counterclockwise. The wheel well area received large deformations, both main gear shock struts received bottoming marks at the bottom suggesting excessive impact load, the mark on the right main gear was deeper than on the left suggesting the right main gear took a higher impact load, the right hand nose wheel hub was fractured and the right hand nose wheel bearing was damaged.
Some elements of aircraft structureLongerons are heavy and their weight should be minimized, so that they are as straight as possible.Sometimes they are high enough to pass over the wing carry through box.In fig 8.6 the longerons are high enough that had to pass over the wing box.A kink over the wing box should be avoided, to minimize weight but also it complicates fabrication and repair.For transports which have fewer cutouts and less concentrated loads, the transports are built with a large number of stringers which are distributed around the circumference of the fuselage. Fig 8.7
Some elements of aircraft structure-wing boxes“box carrythrough”-is virtually standard for high speed transports and general aviation aircraft.

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