This section contains complete requirements
for calendar inspections, operating time special
inspections, and conditional inspections which
apply to the aircraft. The inspections given in this
task shall be carried out at specific periods by
Aviation Unit Maintenance (AVUM) activities in
addition to the inspection requirements contained
in TM 55-1520-240-PM, Phase Maintenance, and
TM 55-1520-240-PMD, Preventive Maintenance
Calendar Inspections are all the inspections
based upon elapsed calendar time.
Operating Time Special Inspections are all
the inspections and maintenance actions
based on aircraft operating time which are
not compatible with scheduled inspection
Conditional Inspections are all the inspections
required when the occurrence of a specific
incident or set of conditions mandates
This manual does not contain
specific tasks for each inspection
requirement contained in the MAC.
Only those inspection tasks which
contain measurable criteria (bearing
damage) are presented. When no
specific inspection task exists, the
term "inspect" refers to a general
visual inspection to look for security,
cracks, leaks, loose or missing
hardware, obvious damage, and
general condition and serviceability.
The inspection requirements indicate which
items require inspection, when they are to
be inspected, and what to look for during the
inspection. The PM and the PMD and the
requirements of this task must be carried out
to make sure faults are found and corrected
before a malfunction or a serious failure results.
Inspections are arranged in the order they should
be carried out and are divided into groups under
headings which locate the area of the aircraft
that covers the group.
Inspection conditions and skills required are
extremely variable and may require changes in
the order in which the inspections are carried
out; however, it is important that all inspections
This manual may contain inspection requirements
applicable to specific equipment not installed
in individual aircraft. When the situation is
encountered, disregard the requirements which
are not applicable.
Standards of serviceability to be used in
day-to-day inspection and maintenance of the
aircraft can be found as fits, tolerances, wear
limits, and specifications elsewhere in this
manual. Standard of serviceability for transfer of
aircraft are contained in TM 55-1500-328-25.