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Then well cover what to look for when performing an aircraft engine borescope inspection. This is the cable connecting the eyepiece/LCD screen to the small CMOS camera. Depending on your goals, you may need a borescope that offers you full flexibility to move up, down, to the left and to the right. Aircraft Owners & Pilots Association Find it free on the store. WebBorescopes are mostly used in nondestructive testing techniques for recognizing defects or imperfections. Make a logbook entry in the aircrafts engine log. ), Pro MicroFlex Flexible (0.5 1.5mm dia. Borescopes So it really varies as far as cost, time, and labor, French continued. One of the best tools for this is a borescope. Start your free trial today! Had my annual inspection come a few months later, that cylinder would never have been yanked. This gives you the opportunity to catch and even adjust your operating procedures to prevent perminate damage. Jeff Simon is an A&P mechanic, IA, pilot, and aircraft owner. Engines tend to be cramped, dark places, and without additional lighting, your inspection may be for naught. The team starts the borescope inspection and inserted borescope camera though port number 9 and finds that there is twisting damage on the turbine blades, they carry out the inspection through all the ports and find out that the twisting damage is present on all the blades of the compressor section also. About four hours into the project, I held the offending jug in my arms and carried it over to my workbench to survey the damage.I inspected the cylinder closely, with special attention on the exhaust valve. Post-employment training to obtain aviation-related national certifications. The range of borescopes in features and functions is pretty wide, and it really depends on what advanced features youre looking for and as well as your budget, said French. Darkhorse will rely on the F-15 engine for takeoff, climb to cruise altitude and acceleration to Mach 2.8 (approximately 2,131 mph). We dont treat it like something that is disposable. Even the most minor of defects can appear larger than life if youre using a borescope with 15x magnification. 2023 Endeavor Business Media, LLC. Borescope Inspection of Aircraft Turbines Works Note the asymmetrical appearance and the region nearly devoid of any deposits (white arrows). Commercial Boeing Planes Naming Image from: - Wikimedia Boeing is one of the leading aircraft manufacturing company. To properly evaluate the internal condition of an engine, youll want a scope with a camera small enough to pass through a spark plug hole. We dont want to whip it out, and we dont want to force it into channels that, when you feel theres restrictions, we dont want to try to force it around. Borescope Inspection Training and Certification WebA method to ensure a complete cylinder borescope profile. We also look for debris, residues, corrosion, wear, or other signs that might indicate that there may be an issue in one of the engines components. And so, some do that in two ways. He has spent the last 22 years promoting owner-assisted aircraft maintenance and created the first inspection tool for geared alternator couplings available at ApproachAviation.com. A rigid cable would restrict the motion of the CMOS camera in linear directions only while the flexible cable can be bent at any orientation to carry out the required work. Feb. 9, 2023. Flawed Exhaust Valve: Notice the green coloring. The valve looked normal, as did the rest of the cylinder. Many of todays aircraft engines are on-condition which means they need to be inspected by a borescope at a certain interval of time to determine if the engine needs maintenance or can continue to fly. Borescopes are essentially thin tubes fitted with a series of lenses and a light. Engine borescope inspections take the work and mess out of the traditional inspection process. Next time, we will cover the last two topics regarding cylinder evaluations: oil use and cylinder cracks. Borescope First, the valve can wobble in the guide, causing excessive wear and poor seating for the valve face. Whichever tool you select for the task at hand, make sure it features LED lighting to illuminate the space youre inspecting. It wasnt long ago that a quality borescope cost thousands of dollars, and the results of the inspection lived only in the memory of the inspector looking through the lens. Once you have the right tool for your specific inspection job, insert the end into the engine. (Now they tell me!). You should see a uniform pattern and not much oil pooling at the bottom of the cylinder bore. Aircraft Borescope Applications The first indication of this is excessive aluminum found in the oil filter. In the flawed valve pictured above youll notice the valve is still rotating (the burn pattern is symetrical), but the valve has been over temped, and will need to be replaced. The most common flaws we detect in aircraft engines are cracks caused by mechanical fatigue, thermal cycling, unintended overheating and vibrations. Irregularity Size, Shape, and Depth Measurement, Determine Serviceability After Abnormal Operations, Eddy Current Fastener/Bore/Bolt Hole Inspections, Colorado Springs, CO (Radiation Test Solutions). Both valves should show uniform seating surfaces indicating that they are sealing well against the seats. The structure of this camera system is designed to be fully flexible and adjustable, making it possible to examine tight areas without damaging any components. Borescope inspections are a type of visual inspection that can examine hard-to-reach or inaccessible components without taking them apart or damaging them. Figure 2 at right shows what valves normally look like. When your done taking pictures relabel the picture files to correspond to the correct cylinder. If you need aviation NDT testing, contact us today We take a closer look! WebAircraft Borescope Applications. Practicing with the borescope helps you get familiar with the technology and allows for more context when you actually delve into the inspection process. We recognize that theres other vehicle options that can meet our requirements and fit in our budget. Each borescope will have a learning curve to it which can vary depending on its features, said Ewert. Second, exhaust gasses and oil can get in between the stem and the guide, building up until the tolerance gets overly tight and the valve sticks. Some models even measure as small as .37mm! While the wide measuring range is useful for measuring large defects, the ability to measure from a greater distance provides another important advantage inspection speed, Ito said. Turbine blades in a P&W PT6A-34 aircraft engine inspected with a Hawkeye V3 HD Borescope. Example: IMG001 = Cyl #1 Exhaust Valve, IMG002 = Cyl #1 Intake Valve, IMG003 = Cyl #1 Side Wall. This cylinder also had low compression with air leaking past the exhaust valve. Another factor to consider is reachability. It is an intricate piece of equipment thats performing a high-level inspection. Exhaust valves endure the higher operating temperatures. Borescopes provide an inside look at areas of an aircraft too small to otherwise see. So heated seats, heated mirrors, other fancy options are nice to have, but do you really need that to get from Point A to Point B? The rope trick really deserves its own write up Well cover that seperately., In some circumstances all the aircraft engine needs is additional flight time. The key areas to inspect with a scope are the cylinder walls, the valves, and the valve seats. But if a unit is damaged, borescopes can be repaired at a cost. Subscribers can view annotate, and download all of SAE's content. Deciding what features and functions you need a borescope to perform is equally important as to knowing what options you dont need. WebLight Source 1. Exhaust valves are the weakest link in most cylinders because they are subject to extreme heat as the combustion gasses flow out of the cylinder, and they can only dissipate this heat through the valve guide and valve seat. Lycoming has published Service Bulletin No. The borescopes must meet the performance requirements for inspections as stated in the manuals issued by aircraft manufacturers, such as the Aircraft Maintenance Manual (AMM) and the Standard Practices Manual (SPM), as well as engine OEMs, he said. Utilizing the borescope features will take some time hopefully supported by clear manual instructions, he said. 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