TM 11-6125-220-20
CHAPTER 1
INTRODUCTION
Section I.
GENERAL
mine whether there are modification work orders
1 - 1 . Scope
(MWO's) pertaining to the equipment.
a. This manual provides organizational maintenance
instructions for Motor-Generators PU-543/A (modified),
1-3. Forms and Records
PU-543A/A (modified), PU-543B/A, PU-543C/A, and
a. Reports of Maintenance and Unsatisfactory Equip-
PU-543D/A. Appendix A contains references to addi-
ment. Maintenance forms, records, and reports which
tional documents to support the procedures contained
are to be used by maintenance personnel at all main-
tenance levels are listed and prescribed by TM 38-750.
allocation chart (MAC) for this equipment.
b. Official nomenclature followed by (*) indicates
b. Reports of Packaging and Handling Deficiencies.
all models of the equipment covered in this manual.
Fill out and forward DD Form 6 (Packaging Improve-
c. Maintenance of Army aircraft is transitioning to
ment Report) as prescribed in AR 700-58/NAVSUPINST
three categories of maintenance. These maintenance
4030.29/AFR 7l-13/MCO P4030.29A, and DSAR 4145.8.
categories are aviation unit maintenance (AVUM); avia-
tion intermediate maintenance (AVIM); and depot main-
c. Discrepancy in Shipment Report (DISREP) (SF
tenance. AVUM and AVIM will replace organizational,
361). Fill out and forward Discrepancy in Shipment
direct support, and general support maintenance. In the
Report (DISREP) (SF 361) as prescribed in AR 55-38/
interim, as maintenance units are reorganized into three
NAVSUPINST 4610.33 A/AFR 75-18/MCO P4610.19B,
categories of maintenance activities, this publication will
and DSAR 4500.15.
be used by AVUM or organizational personnel for the
1-4. Reporting Equipment Improvement Rem
maintenance of Motor-Generator PU-543(*)/A. The
commendations (EIR)
maintenance allocation chart (app B) is configured to the
EIR's will be prepared using DA Form 2407, (Mainten-
three-category maintenance concept where the code O
ance Request). Instructions for preparing EIR's are pro-
represents AVUM; the codes F and H represent AVIM;
vided in TM 38-750, The Army Maintenance Manage-
and D represents depot maintenance. Those organiza-
ment System. EIR's should be mailed direct to Com-
tions not yet assigned complete AVUM responsibilities
mander, US Army Electronics Command, ATTN:
should be cautious when using the publication. What-
DRSEL-MA-Q, Fort Monmouth, NJ 07703. A reply will
ever maintenance is performed must consider available
be furnished direct to you.
skills, tools, test equipment, and time required to perform
the maintenance.
1-5. Administrative Storage
Administrative storage of equipment issued to and used
1-2. Indexes of Publications
a. DA Pam 310-4. Refer to the latest issue of DA
by Army activities shall be in accordance with TM 740-
Pam 310-4 to determine whether there are new editions,
90-1.
changes, or additional publications pertaining to the
1-6. Destruction of Army Electronics Materiel
equipment.
Destruction of Army electronics materiel to prevent
b. DA Pam 310-7, Refer to DA Pam 310-7 to deter-
enemy use shall be in accordance with TM 750-244-2.
DESCRIPTION AND DATA
Section Il.
of an aircraft configuration which require ac power for
1-7. Purpose and Use
operation.
a. Motor-Generator PU-543(*)/A (hereinafter re-
ferred to as the inverter) meeting the requirements of
1-8. Description
MS21983, converts the 28V direct current (dc) from an
aircraft power supply to 115V, 400 Hz alternating cur-
The inverter is a self-contained unit consisting of a
rent (ac), single phase, or to 115/200 volts, 400 Hz ac,
static voltage and frequency regulator (a below) and
3-phase. The output can be either single-phase or three-
a rotating section (b below).
phase, but not both at the same time.
a. Voltage and Frequency Regulator. The regulator
is housed in a rectangular metal box permanently attached
b. The inverter is used to supply ac to those items
1-1