Application Notes: Inspection of Small Aircraft Gas Turbine Engines

Posted: 2018-7-29

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To ensure the safe operation of an aircraft, the entire structure must be routinely and diligently inspected for damage and a decision made on whether it should be kept in service or withdrawn for repairs. Borescope inspection (BSI) is a technique used to visually inspect the internal structure of aircraft engines. The structure of compact gas-turbine engines—used for helicopters, small aircraft, etc.—is relatively simple, so there are only a few parts to inspect. The internal components include a compressor, turbine, fuel nozzle, combustion chamber, and nozzle guide vane (NGV). Inspectors usually use a rigid scope or a fiberscope to visually examine these components. Visual inspection requires proficiency in the inspection technique to prevent any oversight. A rise in the volume and demand for small aircraft inspections has resulted in an increase in the number of new maintenance engineers. And, regardless of their lack of experience with the BSI technique, they are expected to meet the same strict inspection standards as their more proficient counterparts. The easier it is to identify damage, the better.

Solution using IPLEX industrial videoscope high resolution imaging systems

The IPLEX series of industrial videoscopes feature Olympus’ exceptional image quality and application-specific accessories to assist inspectors in compact gas-turbine engine inspections:

High-resolution sensor and PulsarPic processor for crisp, vivid images

Unlike conventional borescopes or fiberscopes, videoscopes display the captured images on a portable monitor. IPLEX videoscopes capture images using a high-resolution solid-state image sensor at the tip of the scope. The captured data are then passed through an optimized image processor called PulsarPic and displayed with excellent clarity on the video monitor. Inspectors have a clear view of components, even those in dark, cramped spaces, making it easier to spot flaws, regardless of their level of experience.

Optical tip adaptor series that anticipates and meets various viewing needs

The insertion tube of an IPLEX videoscope can be used to inspect various parts inside a gas turbine engine by replacing the optical system at its tip. For instance, compressor blades and turbine blades, located relatively near the insertion hole, can be inspected using a side-viewing adaptor with a near focus depth of field (DOF). The larger space of the combustion chamber, on the other hand, can be inspected using a forward-viewing adaptor with a far focus DOF. In addition, the interchangeable optical systems are fixed to the tip of the borescope with a double screw thread to hold them securely in place, helping prevent FOD related accidents.

Benefit to the customer

The live video monitor of an IPLEX series videoscope provides vivid, high quality images of the internal components of gas-turbine engines to aircraft maintenance engineers. Through this powerful imaging technology and a range of optical tip adaptors suited to specific viewing needs, IPLEX videoscopes help ensure that inspectors of all experience levels perform reliable and consistent inspections, contributing to the safe operation of small aircraft gas-turbine engines.

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