Nondestructive Testing at Dobbins Air Reserve Base, Georgia

Senior Airman Elizabeth Van Patten

94th Airlift Wing Public Affairs

When Staff Sgt. Kim Leslie introduces herself as a non-destructive inspection
specialist, she often clarifies that she is a 'crack finder.' While the term is
accurate, it does not capture the depth of her mission.

The 94th Airlift Wing NDI lab uses high-tech equipment to perform operations
on aircraft to ensure Airman safety, cost-effectiveness and mission success.
Finding structural flaws, no matter how minor, can have a major impact.

NDI specialists can be proud of what they do. The lab is a preventative
maintenance shop that keeps accidents from happening - accidents that could
cause loss of life.

Using specialized techniques and equipment, crack finders have also been able
to save the Air Force millions of dollars in damage and countless unscheduled
maintenance man hours, according to Leslie. Additionally, without the NDI lab,
aircraft parts would need to be sent off for inspection, causing an unnecessary
delay in the mission.

"We do check for cracks," said Leslie. "We check all over the aircraft, for
structural integrity. Some of the inspections we do are on the aircraft, and some
are done after other maintainers take the parts off and bring them in. It just
depends on the technical orders."

Technical orders are used across the Air Force to standardize aircraft
inspection.

We use these schedules to routinely inspect the aircraft, said Leslie. That's
where the bulk of the work comes from, but extra inspections may be
scheduled as needed.

The NDI lab uses magnetic particle and eddy current equipment, ultrasonic
detectors and portable X-Ray devices to peer into the aircraft and components
without having to take them apart. Also used is a liquid dye sprayed on a
component, which seeps into any cracks so the defect can be seen under black
light.

NDI specialists attend a ten-week technical school, where they learn the theory
of each procedure used in the lab, followed by extensive on-the-job training.

Airman 1st Class Dylan Brown, 94th AW NDI specialist, gets hands-on training
from the NDI superintendent, and fellow specialists, such as Leslie.

"During tech school, I learned to operate all the machines we use, how to
calibrate them and keep them in working order," said Brown. "We also learned
all the theory behind what we do and why it works."

Brown now applies what he learned in tech school about visual inspection, eddy
current inspection, ultrasonic inspection, radiography, inspections using
penetrants and magnetic particles.

This is all done under the supervision of his qualified wingmen.

Once Brown finishes his upgrade training, he will be a fully qualified and
capable NDI specialist. He will be well versed in not only the theory behind the
inspection techniques, but also in the specialized equipment needed to perform
each type of inspection.

Those inspections occur on every airframe the Air Force operates.

"TOs are being written to prepare for the new C-130 J-models," said Leslie.
"The newer aircraft will have a lot more advanced types of materials on it, which
will require more advanced types of inspection procedures. The amount of work
will likely not change, but the type of work will change. It does help that the
overall theory across the two models are very similar."

Inspections occur over the total lifespan of an aircraft. Once the new J-models
arrive on base, the NDI specialists will have only a little time to adapt to the new
airframes, but it is expected that there will be no decrease in quality or quantity
of inspections.

The eventual force restructure implementation will only be more proof that the
94th Airlift Wing, and its NDI lab, will adapt.

Image - Staff Sgt. Kim Leslie, 94th Airlift Wing non-destructive inspection
specialist, uses a magnetic particle machine to detect cracks in a metal test
piece, which could potentially damage aircraft. The 94th Airlift Wing NDI lab
uses high-tech equipment to perform operations on aircraft to ensure Airman
safety, cost-effectiveness and mission success. (U.S. Air Force photo/Senior
Airman Elizabeth Van Patten)