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AEROSPACE NDT

The National Aerospace Standard - 410 (NAS-410) is an established standard that outlines the minimum qualification requirements for personnel that perform non destructive testing. This certification is commonly required to perform NDT jobs in the aerospace and defense industry.

Each NDT method requires its own certification. The method's degree of difficulty directly influences the certification requirements. Technicians can earn different levels of certification in each method. This standard covers certification in liquid penetrant testing (PT), magnetic particle testing (MT), eddy current testing (ET), ultrasonic testing (UT), and radiography testing (RT).
 
ORGANIZED/STRUCTURED ndt training
 
This is a structured training program that teaches the principles, theories and applications of a particular NDT method. Traditionally, this lecturing style training program in done in a classroom setting.
 
On the Job Training Hours Level I Level II Combined Total
Certifying Method - PT 16 16 32
Certifying Method - MT 16 16 32
Certifying Method - ET 40 40 80
Certifying Method - UT 40 40 80
Certifying Method - RT 40 40 80
 
On the Job Training Hours Level I Level II Combined Total
Certifying Method - PT 130 270 400
Certifying Method - MT 130 400 530
Certifying Method - ET 400 1220 1660
Certifying Method - UT 400 1220 1660
Certifying Method - RT 400 1220 1660
 
Nondestructive Inspection (NDI) of Composites
 

Visual Inspection

 
A visual inspection is the primary inspection method for in-service inspections. Most types of damage scorch, stain, dent, penetrate, abrade, or chip the composite surface, making the damage visible. Once damage is detected, the affected area needs to be inspected closer using flashlights, magnifying glasses, mirrors, and borescopes. These tools are used to magnify defects that otherwise might not be seen easily and to allow visual inspection of areas that are not readily accessible. Resin starvation, resin richness, wrinkles, ply bridging, discoloration (due to overheating, lightning strike, etc.), impact damage by any cause, foreign matter, blisters, and disbonding are some of the discrepancies that can be detected with a visual inspection. Visual inspection cannot find internal flaws in the composite, such as delaminations, disbonds, and matrix crazing. More sophisticated NDI techniques are needed to detect these types of defects.
 

Audible Sonic Testing (Coin Tapping)

 
Sometimes referred to as audio, sonic, or coin tap, this technique makes use of frequencies in the audible range (10Hz to 20 Hz). A surprisingly accurate method in the hands of experienced personnel, tap testing is perhaps the most common technique used for the detection of delamination and/or disbond. The method is accomplished by tapping the inspection area with a solid round disk or lightweight hammer-like device and listening to the response of the structure to the hammer. A clear, sharp, ringing sound is indicative of a well-bonded solid structure, while a dull or thud-like sound indicates a discrepant area.

The tapping rate needs to be rapid enough to produce enough sound for any difference in sound tone to be discernable to the ear. Tap testing is effective on thin skin to stiffener bondlines, honeycomb sandwich with thin face sheets, or even near the surface of thick laminates, such as rotorcraft blade supports. Again, inherent in the method is the possibility that changes within the internal elements of the structure might produce pitch changes that are interpreted as defects, when in fact they are present by design. This inspection should be accomplished in as quiet an area as possible and by experienced personnel familiar with the part’s internal configuration. This method is not reliable for structures with more than four plies. It is often used to map out the damage on thin honeycomb facesheets.
 

Automated Tap Test

 
This test is very similar to the manual tap test except that a solenoid is used instead of a hammer. The solenoid produces multiple impacts in a single area. The tip of the impactor has a transducer that records the force versus time signal of the impactor. The magnitude of the force depends on the impactor, the impact energy, and the mechanical properties of the structure. The impact duration (period) is not sensitive to the magnitude of the impact force; however, this duration changes as the stiffness of the structure is altered. Therefore, the signal from an unflawed region is used for calibration, and any deviation from this unflawed signal indicates the existence of damage.
 

Ultrasonic Inspection

 
Ultrasonic inspection has proven to be a very useful tool for the detection of internal delaminations, voids, or inconsistencies in composite components not otherwise discernable using visual or tap methodology. There are many ultrasonic techniques; however, each technique uses sound wave energy with a frequency above the audible range. A high-frequency (usually several MHz) sound wave is introduced into the part and may be directed to travel normal to the part surface, or along the surface of the part, or at some predefined angle to the part surface. You may need to try different directions to locate the flow. The introduced sound is then monitored as it travels its assigned route through the part for any significant change. Ultrasonic sound waves have properties similar to light waves. When an ultrasonic wave strikes an interrupting object, the wave or energy is either absorbed or reflected back to the surface. The disrupted or diminished sonic energy is then picked up by a receiving transducer and converted into a display on an oscilloscope or a chart recorder. The display allows the operator to evaluate the discrepant indications comparatively with those areas known to be good. To facilitate the comparison, reference standards are established and utilized to calibrate the ultrasonic equipment.

The repair technician must realize that the concepts outlined here work fine in the repetitious manufacturing environment, but are likely to be more difficult to implement in a repair environment given the vast number of different composite components installed on the aircraft and the relative complexity of their construction. The reference standards would also have to take into account the transmutations that take place when a composite component is exposed to an in-service environment over a prolonged period or has been the subject of repair activity or similar restorative action. The four most common ultrasonic techniques are discussed next.
 

Through Transmission Ultrasonic Inspection

 
Through transmission ultrasonic inspection uses two transducers, one on each side of the area to be inspected. The ultrasonic signal is transmitted from one transducer to the other transducer. The loss of signal strength is then measured by the instrument. The instrument shows the loss as a percent of the original signal strength or the loss in decibels. The signal loss is compared to a reference standard. Areas with a greater loss than the reference standard indicate a defective area.
 

Pulse Echo Ultrasonic Inspection

 
Single-side ultrasonic inspection may be accomplished using pulse echo techniques. In this method, a single search unit is working as a transmitting and a receiving transducer that is excited by high voltage pulses. Each electrical pulse activates the transducer element. This element converts the electrical energy into mechanical energy in the form of an ultrasonic sound wave. The sonic energy travels through a Teflon® or methacrylate contact tip into the test part. A waveform is generated in the test part and is picked up by the transducer element. Any change in amplitude of the received signal, or time required for the echo to return to the transducer, indicates the presence of a defect. Pulse echo inspections are used to find delaminations, cracks, porosity, water, and disbonds of bonded components. Pulse echo does not find disbonds or defects between laminated skins and honeycomb core.
 

Phased Array Inspection

 
Phased array inspection is one of the latest ultrasonic instruments to detect flaws in composite structures. It operates under the same principle of operation as pulse echo, but it uses 64 sensors at the same time, which speeds up the process.
 

Ultrasonic Bondtester Inspection

 
Low-frequency and high-frequency bondtesters are used for ultrasonic inspections of composite structures. These bondtesters use an inspection probe that has one or two transducers. The high-frequency bondtester is used to detect delaminations and voids. It cannot detect a skin-to-honeycomb core disbond or porosity. It can detect defects as small as 0.5-inch in diameter. The low-frequency bondtester uses two transducers and is used to detect delamination,
 

Radiography

 
Radiography, often referred to as X-ray, is a very useful NDI method because it essentially allows a view into the interior of the part. This inspection method is accomplished by passing X-rays through the part or assembly being tested while recording the absorption of the rays onto a film sensitive to X-rays. The exposed film, when developed, allows the inspector to analyze variations in the opacity of the exposure recorded onto the film, in effect creating a visualization of the relationship of the component’s internal details. Since the method records changes in total density through its thickness, it is not a preferred method for detecting defects such as delaminations that are in a plane that is normal to the ray direction. It is a most effective method, however, for detecting flaws parallel to the X-ray beam’s centerline. Internal anomalies, such as delaminations in the corners, crushed core, blown core, water in core cells, voids in foam adhesive joints, and relative position of internal details, can readily be seen via radiography. Most composites are nearly transparent to X-rays, so low energy rays must be used. Because of safety concerns, it is impractical to use around aircraft. Operators should always be protected by sufficient lead shields, as the possibility of exposure exists either from the X-ray tube or from scattered radiation. Maintaining a minimum safe distance from the X-ray source is always essential.
 

Thermography

 
Thermal inspection comprises all methods in which heat-sensing devices are used to measure temperature variations for parts under inspection. The basic principle of thermal inspection consists of measuring or mapping of surface temperatures when heat flows from, to, or through a test object. All thermographic techniques rely on differentials in thermal conductivity between normal, defect free areas, and those having a defect. Normally, a heat source is used to elevate the temperature of the part being examined while observing the surface heating effects. Because defect free areas conduct heat more efficiently than areas with defects, the amount of heat that is either absorbed or reflected indicates the quality of the bond. The type of defects that affect the thermal properties include debonds, cracks, impact damage, panel thinning, and water ingress into composite materials and honeycomb core. Thermal methods are most effective for thin laminates or for defects near the surface.
 

Neutron Radiography

 
Neutron radiography is a nondestructive imaging technique that is capable of visualizing the internal characteristics of a sample. The transmission of neutrons through a medium is dependent upon the neutron cross sections for the nuclei in the medium. Differential attenuation of neutrons through a medium may be measured, mapped, and then visualized.
 

Moisture Detector

 
A moisture meter can be used to detect water in sandwich honeycomb structures. A moisture meter measures the RF power loss caused by the presence of water. The moisture meter is often used to detect moisture in nose radomes.
 

COMMON METHODS

 
 

OTHER METHODS

 
When invoked by engineering, quality, cognizant engineering organization or prime contractor requirements, this standard applies to other current and emerging NDT methods used to determine the acceptability or suitability for intended service of a material, part, component, sub-assembly or assembly. Such methods may include, but are not limited to, acoustic emission, neutron radiography, leak testing and holography. The requirements for personnel training, experience, and examination for these other methods shall be established in accordance with paragraph 6.4 and shall be documented by the employer.

The introduction of new NDT methods is when the resources of a NANDTB would be most useful to an employer.

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training center in Hazaribagh aerospace training center in Lohardaga aerospace training center in Palamu aerospace training center in Ranchi aerospace training center in Dumka aerospace training center in Chaibasa(West Straining center inghbhum) aerospace training center in Jamshedpur(East Straining center inghbhum) aerospace training center in Bokaro aerospace training center in Chatra aerospace training center in Garhwa aerospace training center in Koderma aerospace training center in Pakur aerospace training center in Sahebganj aerospace training center in Simdega aerospace training center in Latehar aerospace training center in Saraikela aerospace training center in Jamtara aerospace training center in Chattisgarh aerospace training center in Bastar aerospace training center in Bilaspur aerospace training center in Dantewada aerospace training center in Dhamtari aerospace training center in Durg aerospace training center in Janjgir-Champa aerospace training center in Jashpur aerospace training center in Kanker aerospace training center in Kawardha aerospace training center in Korba aerospace training center in Koriya aerospace training center in Mahasamund aerospace training center in Raigarh aerospace training center in Rajnandgaon aerospace training center in Surguja aerospace training center in Raipur aerospace training center in Amaravati, aerospace training center in Itanagar, aerospace training center in Assam, aerospace training center in Dispur, aerospace training center in Bihar, aerospace training center in Patna, aerospace training center in Chhattisgarh, aerospace training center in Raipur, aerospace training center in Goa, aerospace training center in Panaji, aerospace training center in Gujarat, aerospace training center in Gandhtraining center ingar, aerospace training center in Haryana, aerospace training center in Chandigarh, aerospace training center in HimachalPradesh, aerospace training center in Shimla, aerospace training center in Jammu and Kashmir, aerospace training center in Srrnagar, aerospace training center in Jharkhand, aerospace training center in Ranchi, aerospace training center in Karnataka, aerospace training center in Bengaluru, aerospace training center in Thiruvananthapuram, aerospace training center in Madhya Pradesh, aerospace training center in Bhopal, aerospace training center in Maharashtra, aerospace training center in Mumbai, aerospace training center in Manipur, aerospace training center in Imphal, aerospace training center in Meghalaya, aerospace training center in Shillong, aerospace training center in Mizoram, aerospace training center in Aizawl, aerospace training center in Nagaland, aerospace training center in Kohima, aerospace training center in Odisha, aerospace training center in Bhubaneswar, aerospace training center in Punjab, aerospace training center in Chandigarh, aerospace training center in Rajasthan, aerospace training center in Jaipur, aerospace training center in Sikkim, aerospace training center in Gangtok, aerospace training center in Tamil Nadu, aerospace training center in Chennai, aerospace training center in Telangana, aerospace training center in Hyderabad, aerospace training center in Tripura, aerospace training center in Agartala aerospace training center in Uttar Pradesh, aerospace training center in Lucknow, aerospace training center in Uttarakhand, aerospace training center in Dehradun, aerospace training center in West Bengal, aerospace training center in Kolkata, aerospace training center in Andaman and Nicobar Islands, aerospace training center in Port Blair, aerospace training center in Chandigarh, aerospace training center in adar and Nagar Haveli, aerospace training center in Silvassa, aerospace training center in Daman and Diu, aerospace training center in Daman, aerospace training center in Delhi, aerospace training center in akshadweep, aerospace training center in Kavaratti, aerospace training center in Pondicherry aerospace Training center in Afghanistan, aerospace Training center in Akrotiri, aerospace Training center in Albania, aerospace Training center in Algeria, aerospace Training center in American Samoa, aerospace Training center in Andorra, aerospace Training center in Angola, aerospace Training center in Anguilla, aerospace Training center in Antarctica, aerospace Training center in Antigua and Barbuda, aerospace Training center in Argenttraining center ina, aerospace Training center in Armenia, aerospace Training center in Aruba , aerospace Training center in Ashmore and Cartier Islands , aerospace Training center in Australia, aerospace Training center in Austria, aerospace Training center in Azerbaijan, aerospace Training center in Bahamas, The, aerospace Training center in Bahratraining center in, aerospace Training center in Bangladesh, aerospace Training center in Barbados, aerospace Training center in Bassas da aerospace training center india aerospace Training center in Belarus, aerospace Training center in Belgium, aerospace Training center in Belize, aerospace Training center in Bentraining center in, aerospace Training center in Bermuda, aerospace Training center in Bhutan, aerospace Training center in Bolivia, aerospace Training center in Bosnia and Herzegovtraining center ina, aerospace Training center in Botswana, aerospace Training center in Bouvet Island, aerospace Training center in Brazil, aerospace Training center in British Training center indian Ocean Territory aerospace Training center in British Virgtraining center in Islands aerospace Training center in Brunei aerospace Training center in Bulgaria aerospace Training center in Burktraining center ina Faso aerospace Training center in Burma aerospace Training center in Burundi aerospace Training center in Cambodia aerospace Training center in Cameroon aerospace Training center in Canada aerospace Training center in Cape Verde aerospace Training center in Cayman Islands aerospace Training center in Central African Republic aerospace Training center in Chad aerospace Training center in Chile aerospace Training center in Chtraining center ina aerospace Training center in Christmas Island aerospace Training center in Clipperton Island aerospace Training center in Cocos (Keeltraining center ing) Islands aerospace Training center in Colombia aerospace Training center in Comoros aerospace Training center in Congo, Democratic Republic of the aerospace Training center in Congo, Republic of the aerospace Training center in Cook Islands aerospace Training center in Coral Sea Islands aerospace Training center in Costa Rica aerospace Training center in Cote d'Ivoire aerospace Training center in Croatia aerospace Training center in Cuba aerospace Training center in Cyprus aerospace Training center in Czech Republic aerospace Training center in Denmark aerospace Training center in Dhekelia aerospace Training center in Djibouti aerospace Training center in Domtraining center inica aerospace Training center in Domtraining center inican Republic aerospace Training center in Ecuador aerospace Training center in Egypt aerospace Training center in El Salvador aerospace Training center in Equatorial Gutraining center inea aerospace Training center in Eritrea aerospace Training center in Estonia aerospace Training center in Ethiopia aerospace Training center in Europa Island aerospace Training center in Falkland Islands (Islas Malvtraining center inas) aerospace Training center in Faroe Islands aerospace Training center in Fiji aerospace Training center in Ftraining center inland aerospace Training center in France aerospace Training center in French Guiana aerospace Training center in French Polynesia aerospace Training center in French Southern and Antarctic Lands aerospace Training center in Gabon aerospace Training center in Gambia, The aerospace Training center in Gaza Strip aerospace Training center in Georgia aerospace Training center in Germany aerospace Training center in Ghana aerospace Training center in Gibraltar aerospace Training center in Glorioso Islands aerospace Training center in Greece aerospace Training center in Greenland aerospace Training center in Grenada aerospace Training center in Guadeloupe aerospace Training center in Guam aerospace Training center in Guatemala aerospace Training center in Guernsey aerospace Training center in Gutraining center inea aerospace Training center in Gutraining center inea-Bissau aerospace Training center in Guyana aerospace Training center in Haiti aerospace Training center in Heard Island and McDonald Islands aerospace Training center in Holy See (Vatican City) aerospace Training center in Honduras aerospace Training center in Hong Kong aerospace Training center in Hungary aerospace Training center in Iceland aerospace Training center india aerospace Training center indonesia aerospace Training center in Iran aerospace Training center in Iraq aerospace Training center in Ireland aerospace Training center in Isle of Man aerospace Training center in Israel aerospace Training center in Italy aerospace Training center in Jamaica aerospace Training center in Jan Mayen aerospace Training center in Japan aerospace Training center in Jersey aerospace Training center in Jordan aerospace Training center in Juan de Nova Island aerospace Training center in Kazakhstan aerospace Training center in Kenya aerospace Training center in Kiribati aerospace Training center in Korea, North aerospace Training center in Korea, South aerospace Training center in Kuwait aerospace Training center in Kyrgyzstan aerospace Training center in Laos aerospace Training center in Latvia aerospace Training center in Lebanon aerospace Training center in Lesotho aerospace Training center in Liberia aerospace Training center in Libya aerospace Training center in Liechtenstetraining center in aerospace Training center in Lithuania aerospace Training center in Luxembourg aerospace Training center in Macau aerospace Training center in Macedonia aerospace Training center in Madagascar aerospace Training center in Malawi aerospace Training center in Malaysia aerospace Training center in Maldives aerospace Training center in Mali aerospace Training center in Malta aerospace Training center in Marshall Islands aerospace Training center in Marttraining center inique aerospace Training center in Mauritania aerospace Training center in Mauritius aerospace Training center in Mayotte aerospace Training center in Mexico aerospace Training center in Micronesia, Federated States of aerospace Training center in Moldova aerospace Training center in Monaco aerospace Training center in Mongolia aerospace Training center in Montserrat aerospace Training center in Morocco aerospace Training center in Mozambique aerospace Training center in Namibia aerospace Training center in Nauru aerospace Training center in Navassa Island aerospace Training center in Nepal aerospace Training center in Netherlands aerospace Training center in Netherlands Antilles aerospace Training center in New Caledonia aerospace Training center in New Zealand aerospace Training center in Nicaragua aerospace Training center in Niger aerospace Training center in Nigeria aerospace Training center in Niue aerospace Training center in Norfolk Island aerospace Training center in Northern Mariana Islands aerospace Training center in Norway aerospace Training center in Oman aerospace Training center in Pakistan aerospace Training center in Palau aerospace Training center in Panama aerospace Training center in Papua New Gutraining center inea aerospace Training center in Paracel Islands aerospace Training center in Paraguay aerospace Training center in Peru aerospace Training center in Philipptraining center ines aerospace Training center in Pitcairn Islands aerospace Training center in Poland aerospace Training center in Portugal aerospace Training center in Puerto Rico aerospace Training center in Qatar aerospace Training center in Reunion aerospace Training center in Romania aerospace Training center in Russia aerospace Training center in Rwanda aerospace Training center in Satraining center int Helena aerospace Training center in Satraining center int Kitts and Nevis aerospace Training center in Satraining center int Lucia aerospace Training center in Satraining center int Pierre and Miquelon aerospace Training center in Satraining center int Vtraining center incent and the Grenadtraining center ines aerospace Training center in Samoa aerospace Training center in San Martraining center ino aerospace Training center in Sao Tome and Prtraining center incipe aerospace Training center in Saudi Arabia aerospace Training center in Senegal aerospace Training center in Serbia and Montenegro aerospace Training center in Seychelles aerospace Training center in Sierra Leone aerospace Training center in Straining center ingapore aerospace Training center in Slovakia aerospace Training center in Slovenia aerospace Training center in Solomon Islands aerospace Training center in Somalia aerospace Training center in South Africa aerospace Training center in South Georgia and the South Sandwich Islands aerospace Training center in Spatraining center in aerospace Training center in Spratly Islands aerospace Training center in Sri Lanka aerospace Training center in Sudan aerospace Training center in Surtraining center iname aerospace Training center in Svalbard aerospace Training center in Swaziland aerospace Training center in Sweden aerospace Training center in Switzerland aerospace Training center in Syria aerospace Training center in Taiwan aerospace Training center in Tajikistan aerospace Training center in Tanzania aerospace Training center in Thailand aerospace Training center in Timor-Leste aerospace Training center in Togo aerospace Training center in Tokelau aerospace Training center in Tonga aerospace Training center in Trtraining center inidad and Tobago aerospace Training center in Tromeltraining center in Island aerospace Training center in Tunisia aerospace Training center in Turkey aerospace Training center in Turkmenistan aerospace Training center in Turks and Caicos Islands aerospace Training center in Tuvalu aerospace Training center in Uganda aerospace Training center in Ukratraining center ine aerospace Training center in United Arab Emirates aerospace Training center in United Ktraining center ingdom aerospace Training center in United States aerospace Training center in Uruguay aerospace Training center in Uzbekistan aerospace Training center in Vanuatu aerospace Training center in Venezuela aerospace Training center in Vietnam aerospace Training center in Virgtraining center in Islands aerospace Training center in Wake Island aerospace Training center in Wallis and Futuna aerospace Training center in West Bank aerospace Training center in Western Sahara aerospace Training center in Yemen aerospace Training center in Zambia aerospace Training center in Zimbabwe