Section I. GENERAL
1-1. Scope. This manual is for your use in operating and maintaining the Power Unit PU-789/M. The PU-
789/M is a mobile power unit used to supply power to the Patriot Information Coordination Central (ICC) and its
Antenna Mast Group (AMG) or to the Communications Relay Group (CRG) and its Antenna Mast Group. In
addition to operating instructions and operator, unit, direct support and general support maintenance
procedures, this manual contains a Repair Parts and Special Tools List for the power unit.
1-2. Maintenance Forms and Records. Maintenance forms and records used by Army personnel are
prescribed by DA Pam 738-750.
1-3. Reporting of Errors. Reporting of errors and omissions and recommendations for improvement of this
publication by the individual user is encouraged Reports should be submitted on a DA Form 2028 directly to
Commander, U S Army Aviation and Troop Command, ATTN: AMSAT-I-MP, 4300 Goodfellow Boulevard, St.
Louis, MO 63120-1798.
1-4. Reporting Equipment Improvement Recommendations (EIR). EIR's will be prepared using SF 368
Product Quality Deficiency Report. Instructions for preparing EIR's are provided in DA Pam 738-750, The
Army Maintenance Management System. EIR's should be mailed directly to Commander, U.S. Army Aviation
and Troop Command, ATTN: AMSAT-I-MDS, 4300 Goodfellow Boulevard, St. Louis, MO 63120-1798.
1-5. Levels of Maintenance Accomplishment. Army users shall refer to the Maintenance Allocation Chart
(MAC) for tasks and levels of maintenance to be performed.
1-6. Destruction of Army Materiel. Destruction of Army Materiel to prevent enemy use shall be in
accordance with TM 750-244-3.
1-7. Administrative Storage.
Placement of equipment in administrative storage should be for short periods of time when a
shortage of maintenance effort exists. Items should be in mission readiness within 24 hours or within the time
factors as determined by the directing authority. During the storage period appropriate maintenance records
will be kept.
Army equipment placed in administrative storage will have preventive maintenance performed In
accordance with the PMCS tables before storage. When equipment is removed from storage, PMCS will be
performed to assure operational readiness.
Storage site selection. Inside storage is preferred for items selected for administrative storage. If
inside storage is not available, trucks, vans, conex containers and other containers may be used.
1-8. Preparation for Shipment and Storage. Refer to TB 740-97-2.