7.10 Springs Flashcards
What maintenance do springs generally require?
Springs generally require little to no maintenance.
What can cause springs to lose their strength?
Springs can become corroded over time or can become overheated when enduring high temperatures.
What is the consequence of springs losing their mechanical properties?
They may cease to satisfy the task for which they were designed.
How are springs inspected?
Inspection and testing of springs are carried out in accordance with the applicable maintenance manuals and manufacturers guidelines.
What are the indicators of spring inspection?
Springs are inspected for blueing, pitting, compression strength, free length, distortion, and spring damage.
What does blueing indicate in springs?
Blueing indicates overheating and the loss of temper/strength.
What happens when overheating is detected in a spring?
It must be assumed that the spring is no longer suitable for the designed task.
What is pitting in springs?
Pitting is caused by corrosion and reduces the load capacity of the spring.
What is the effect of corrosion on cyclic load springs?
The combination of fatigue and corrosion results in a severe loss of fatigue strength.
How is fatigue in springs checked?
Fatigue is checked by comparing springs against figures or graphs to determine their condition.
What is a static measurement in spring inspection?
Static measurement, or free length measurement, involves measuring the length of the unloaded spring and comparing it to the manufacturer’s published dimension.
What is a load or deflection check?
A load or deflection check is done using a test rig to load the spring and measure its deflection.
What happens if a spring fails inspection checks?
If a spring fails any of these checks, it must be replaced with a serviceable item.
