TM 55-1520-240-PM
SECTION I. GENERAL INFORMATION
1-1. PHASED SCHEDULE.
This phased maintenance inspection checklist contains requirements for
inspection of the CH-47D helicopter on a phase schedule having 800-hour
(flight hour) cycle with 200-hour phases. Each requirement included herein
is designated for accomplishment at least once, but not more than four times
during the 800-hour cycle.
1-2. EXCEEDING THE PHASED SCHEDULE.
a.
The phased maintenance inspection intervals designated are the
maximum and shall not be exceeded except in actual operational emergencies
as explained herein. It is the Commander’s responsibility to determine, on an
individual helicopter basis, when inspection intervals may be exceeded. For
this purpose, operational emergencies are conditions of combat or conditions
of disaster which necessitate flight to evacuate aircraft or personnel. Those
inspections annotated with a "C" in the Inspect Phase No’s column, along
with all applicable aircraft forms as addressed in DA PAM 738-751 items
that are due, are considered the MINIMUM mandatory combat maintenance
inspection requirements for helicopters scheduled for imminent deployment
to, or stationed in, a combat environment. Under no circumstances will two
combat maintenance inspections be performed sequentially.
b.
When the aircraft is operated beyond the normal inspection due
time because of such emergency situations, a circled red X status symbol
and an appropriate statement, to include authority, must be entered on appli-
cable aircraft forms as addressed in DA PAM 738-751, until such time as the
inspection is complete. When inspections are delayed to meet emergency
requirements, Commander will assure that the helicopter status symbol is
changed to a red X and that the delayed inspections are accomplished imme-
diately upon termination of the actual emergency.
c.
When unusual local conditions of environment, utilization, mission,
experience of flight crew and maintenance personnel, periods of inactivity, etc.
are encountered, the Maintenance Officer will, at his discretion, increase the
scope and/or frequency of maintenance or inspection as necessary to insure
safe flight. Refer to TM 1-1500-328-23.
1-3. MAINTENANCE ACTIVITIES.
The inspections prescribed by this checklist will be accomplished at specified
phases by Aviation Unit Maintenance (AVUM) activities with assistance of
Aviation Intermediate Maintenance (AVIM) and Depot Maintenance activities
when required. Space is provided for inspecting personnel to record faults
and/or remarks and corrective action taken.
1-4. LIMITATIONS.
The checklist does not contain instructions for repair, adjustment, or other
means of rectifying conditions. Neither does it contain special tolerances,
limits, or instructions for special troubleshooting to find causes of malfunctions.
Such data will be obtained from the TM 55-1520-240-23, Maintenance Manual,
and TM 55-1520-240-T, Troubleshooting Manual.
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