TM 1-1520-238-PM
1–1
SECTION I.
GENERAL INFORMATION
PHASED SCHEDULE.
Phased maintenance inspection contains requirements for inspection of the AH-64A helicopter on a phased schedule having a 1000-hour
cycle with 250-hour phases. Each requirement included herein is designated for accomplishment at least once, but not more than four times during the 1000-hour cycle.
EXCEEDING THE PHASED SCHEDULE.
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 aircraft 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 by a “C” in the Inspect Phase Nos. column, along with the DA Form 2408-18 (Equipment Inspection List), 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. When aircraft are 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 in block 16 and 17 of DA Form 2408-13
(Aircraft Inspection and Maintenance Record) until such time as the inspection is complete. When inspections are delayed to meet emergency requirements,
Commanders will assure that the aircraft status symbol reverts to a red X and that delayed inspections are accomplished immediately upon termination of the
emergency. When unusual local conditions (utilization, type of mission, personnel, periods of inactivity, environmental conditions, etc.) dictate, it is the prerogative and
responsibility of the Maintenance Officer to increase the scope and/or frequency of maintenance or inspection as necessary to ensure safe operation
(TM 1-1500-328-23).
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. The inspection of the part/component is visual unless
stated otherwise.
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 for malfunctions. Such data will be obtained from the latest issue of the aircraft TM 1-1520-238-23
–series Maintenance Manuals.
CHANGEOVER TO THE PHASED MAINTENANCE SYSTEM.
Changeover shall be accomplished in accordance with instructions provided in TB 55-1500-337-24
entitled, “Phased Maintenance System for Army Aircraft.” The requirements of this TB must be accomplished prior to implementation of Phase 1 inspection
requirements specified in this checklist.
PRE-INSPECTION MAINTENANCE TEST FLIGHT (MTF).
A pre-inspection MTF to duplicate non-hazardous equipment problems, determine unsatisfactory
conditions, determine equipment operation problems, etc., is recommended prior to start of aircraft disassembly for phased maintenance inspection. The decision to
perform the pre-inspection MTF, however, shall be the responsibility of the unit Maintenance Officer.
SPECIAL INSPECTIONS, CALENDAR INSPECTIONS, AND LUBRICATION REQUIREMENTS.
Special inspections, calendar inspections, and lubrication require-
ments contained in TM 1-1520-238-23 and those listed on the aircraft’s DA Form 2408-18 shall be reviewed and accomplished in accordance with the “inspection due”
requirements specified in those documents.
