Keep vise jaws covered with soft metal jaw caps
Maintenance of Shop Equipment. Maintenance of shop equipment consists of cleaning, preventive
maintenance, and replacement of defective parts. Preventive maintenance includes before-operation, during-operation,
after-operation services performed by operator, and scheduled services to be performed at designated intervals.
Consult the operation and service Instructions manual for specific maintenance instructions on particular types of
2-3. NDI Shop Requirements. A typical NDI shop facility consists of various rooms adapted for specific NDI tests.
Proper electrical and plumbing connections must be provided for smooth shop operation Refer to TM 55-1500-335-23 for
room and equipment schedules
2-4. Types of Inspections. Destructive and nondestructive inspections and tests are accomplished to detect flaws and
defects. The following paragraphs explain both types.
Destructive Tests. Destructive tests are used to detect flaws and defects in aircraft components. Damage
caused by this type of test renders the part unserviceable. Brinell, Rockwell, and Vickers hardness tests are examples of
Nondestructive Tests. NDI testing methods are those methods which may be applied to a structure or
component to determine its integrity, composition, physical, electrical, or thermal properties, or dimensions without
causing a change in any of these characteristics These methods include.
Liquid penetrant methods
Magnetic particle methods
Penetrating radiation methods
Need For Both Types of Tests. Destructive and nondestructive tests are both used to perform inspection
functions. No method should ever be considered conclusive. Limits for acceptance and rejection are as much a part of
an inspection as the method Itself Refer to the applicable maintenance manual for correct testing method.
2-5. Personnel Requirements. Effective utilization of NDI can be attained only by highly trained and well experienced
personnel. Commanders will ensure that properly trained and qualified personnel will be available The training
requirements are waived for the black lights, ultrasonic leak detector, and optical equipment This qualification may be
met through the NDI basic technician course
2-6. Use of Data. The information gathered from nondestructive tests can be used to develop specifications and
standards for new items before they are procured This historical data can provide a diagnostic trail which will highlight the
effects of various stress or use conditions on an item. The data can also distinguish the best NDI technique to use on the
new item, based on its composition and Intended application.
2-7. Flaw Detection. The various types of cracks that can be detected are defined in tables 2-1 and 2-2.