This manual contains instructions for accomplishing Nondestructive Inspection (NDI) of the AH-64A helicopter at
the AVUM and AVIM levels. The procedures described in this manual are intended to provide instructions for the NDI of
locations where service defects would prevent items from performing their designated functions, and of components for
serviceability. These procedures were developed through review of AH-64A Aircraft Technical Manual inspection
requirements. The goal is to upgrade these requirements wherever possible using NDI methodology to improve
inspection quality, decrease inspection time, and increase systems operational readiness. Other factors involved were
maintenance engineering analysis, experience, and comparison with similar installations. Procedures shall be reviewed
and changes and additions made during the service life of the equipment by continually evaluating the following:
performance of the equipment, results of scheduled inspections, and thorough study of failure data. Local conditions,
such as special utilization of climatic environment, may dictate more detailed inspections. Commanders and their
maintenance officers are expected to exercise their prerogative to increase the frequency and scope of any inspection as
This manual may pertain to part, or all types and series, of a model, and may, therefore, contain requirements
applicable to specific equipment that is not installed on an individual model. When this situation is encountered, those
requirements that are not applicable should be disregarded.
This manual does not contain inspection level or frequency, acceptance and rejection limitations, nor instructions
for correcting defective conditions. Inspection levels and frequency are provided in the inspection requirements
manuals. Detailed acceptance and rejection criteria and instructions for correcting defective conditions are provided in
applicable maintenance manuals and are, therefore, not contained in this manual. Decisions regarding the serviceability
of components properly belong with maintenance technicians trained, skilled, and experienced in their particular
specialty, such as airframe, hydraulic, or propulsion. Also, it would duplicate existing information and make the task of
incorporating the numerous changes to inspection frequency and repair instructions impractical.
The inspection requirements are stated in such a manner as to address the following: (1) What part or area is to
be inspected? (2) What conditions are to be sought? (3) What NDI method is to be used? (4) How is the method to be
performed? In scope, the inspection procedures are designed to direct attention of maintenance personnel to
components and areas where service defects can occur. The procedures also provide detailed instructions on the
application of NDI in an effort to ensure the serviceability of these areas.
e. Nondestructive inspection methods require application by trained, experienced, and proficient technicians. This
manual provides detailed procedures for the application of nondestructive methods to inspect specific areas or locations.
However, it must be emphasized that the reliability of the inspection depends upon the proper evaluation of the results
obtained from the inspection equipment.