Spar: The main longitudinal beam or beams of a wing or control surface. Secondary structures are built around the spar to transfer the load to it, and in the case of wing ribs, also to give correct aerofoil form.
SPAR
A principal section of the wing structure of an airplane, going from tip to tip.
SPECI
Special Report (Meteo) ...
SPAR - A primary structural member of an airfoil surface, from which ribs or frames are mounted to form the desired airfoil contours.
SPINNER - A streamlined fairing over a propeller hub.
The spar splice and torque box area could be the subject of concern on an inactive, older airplane that was either crudely built or, more likely, saw outside or bad storage.
This can be done by bringing the rear spar in line with the leading edge. Stand squarely in front of the center of the ma- chine 15 to 20 ft. away.
Aftermarket kits for the rear wing spar, vertical fin attach plate, and rudder hinge were developed to address several airworthiness directives (ADs) that were issued soon after these models hit the ramp.
The spar does have a temperature limitation of 55 C or 131 F. There is an indicator located on the rear portion of the spar that is accessible by lifting the flap between the two seat cushions.
VIII, the triplane was grounded not because of spar failure, but because of the disintegration of the secondary structure- wing ribs etc- whilst the spars remained intact. The similarity of the failures in the N28 and Dr.
The purpose of the forward-swept wing was to allow an unimpeded cabin without a large wing spar passing through it),
The Saab Safari, a 1969 military trainer, used slightly forward-swept wings to increase visibility.
Since the wings were already developing 4 Gs, you don't need to increase that very much before you snap the wing spar.
Even if you don't break the airplane, you might break the pilot.
The 'spar' that supports the wings is roughly the diameter of a pencil.
Where the tubes meet in the centre a small rod or tube inside the spar tubes allows them to move opposite to each other but must be a loose fit (dihedral) and a washer glued in the centre to stop it moving up either tube.
In all configurations we want a strong airframe without undue weight - thus we need a thick airfoil to be able to use a deep spar and have a large "torque tube" which will give bending strength and stiffness as well as torsional strength and rigidity.
Usually caused by wing construction, the spar location is the culprit here.
Always dip the tanks after refueling. Even when refueling with a known quantity.
Do the refueling yourself.
 See also: Aircraft, Pilot, Plane, Front, Wing
  
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