How do you check aircraft cable tension?

In the field, mechanics routinely use cable tensiometers to check tensions on aircraft control cables. The process is simple: Clamp the tensiometer on the cable, take a reading, compare it to the calibration chart with the tool (referencing cable size), and you get the resulting tension.

How do you measure tension in a cable?

The tension can be measured directly by simply pulling on the cable with a force gauge; the tension equals the measured force that is just sufficient to unseat the stopper.

Where is the cable tension checked?

Aileron systems actually have three cables: two cables connect the left and right bellcranks to the control wheels, and a third, “carry–through” cable connects the two bellcranks to each other. A tensiometer is used to check the tension on each cable.

How do you tension a plane cable?

Cable tensions are adjusted by twisting the turnbuckles that connect different sections of cable together. It’s a simple system, but you need to hold each cable end stable while turning the turnbuckle in order to avoid putting twisting stress on the cable itself.

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How do you ensure that an aircraft cables are rigged properly?

Lock the flight deck control, bellcranks, and the control surfaces in the neutral position. Adjust the cable tension, maintaining the rudder, elevators, or ailerons in the neutral position. Adjust the control stops to limit the control surface travel to the dimensions given for the aircraft being rigged.

How do I measure tension?

A tension meter is a device used to measure tension in wires, cables, textiles, Mechanical belts and more. Meters commonly use a 3 roller system where the material travels through the rollers causing deflection in the center roller that is connected to an analog indicator or load cell on digital models.

How do you calculate tension?

The pulling force that acts along a stretched flexible connector, such as a rope or cable, is called tension, T. When a rope supports the weight of an object that is at rest, the tension in the rope is equal to the weight of the object: T = mg.

When checking cable tensions What are you looking for?

To determine the amount of tension on a cable, a tensiometer is used. When properly maintained, a tensiometer is 98 percent accurate. Cable tension is determined by measuring the amount of force needed to make an offset in the cable between two hardened steel blocks called anvils.

What is a rigging check?

Regular rig checks prevent the risk of mast and rigging failure at sea. This includes regular rig inspections of the spars, rigging and fittings, especially before a major passage at sea. … A quick visual rig check is sometimes all that it takes to deal with a potential problem.

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How does a cable tension meter work?

Tension meters are clamped onto a cable or wire rope to measure the deflection of the material and then convert the deflection into tension. Accurate tensioning allows the safe installation or monitoring of cables, wire ropes, and other materials.

Why do cable systems lose tension?

Cables can lose tension because of construction stretch, anchor creep, fitting slippage, and/or previous impacts elsewhere in the same run of HTCG.

When a cable is supported at different level the maximum tension in the cable occur?

This equation also shows that the maximum tension occurs at the end supports, that is at x = 0 and x = L , which is also where the slope of the cable is maximum. The minimum tension occurs at the mid-span and is equal to H .