Section I. General
ment, let us know. Send us an EIR. You, the user, are the
only one who can tell us what you don't like about your
This manual contains the direct support maintenance
equipment. Let us know why you don't like the design. Tell
instructions for the Static Power Inverter PP-7274D/A
us why a procedure is hard to perform. Put it on an SF 368
(EMP Model PS277-3), (inverter. The maintenance
(Quality Deficiency Report), Mail it to Commander, US
allocation chart for the inverter is located in TM
Monmouth, ATTN: DRSEL-ME-MQ, Fort Monmouth,
NJ 07703. Well send you a reply.
1-2. Index of Technical Publication
1-5. Administrative Storage
Refer to the latest issue of DA Pam 310-4 to determine
whether there are new editions, changes or additional
a. If inverter is to be stored for longer than 3 years,
publications pertaining to the equipment.
operate inverter for 1 hour before storage (see b below).
After 3 years in storage, remove inverter from barrier
1-3. Maintenance Forms, Records, and Reports
materiel and operate inverter for 1 hour. Inverter may be
a. Reports of Maintenance and Unsatisfactory Equip-
returned to storage for another 3 years. Inverter can be
ment. Department of the Army forms and procedures used
stored for a maximum of 10 years. After this time, the
for equipment maintenance will be those prescribed by TM
electrolytic capacitors in the input capacitor bank must be
38-750, The Army Maintenance Management System
b. Install plastic caps on connectors Jl and J2. Position
b. Report of Packaging and Handling Deficiencies. Fill
inverter in barrier material (Specification MIL-B-0131).
out and forward SF 364 (Report of Discrepancy (ROD))
as prescribed in AR-735-1l-2/ DLAR 4140.55/ NAV-
(Specification MIL-D-3464) into barrier material and heat
MATINST 4355.73/ AFR 400-54/ MCO 4430.3E.
seal barrier material.
c. Discrepancy in Shipment Report (DISREP) (SF361)
c. It is desirable that storage temperature not exceed 37
as prescribed in AR55-38/NAVSUPINST4610.33B /AFR
C (127 F). For further information on storage require-
75-18/MCO 4610.19/DLAR 4500.15.
ments, refer to TM 740-90-1, Administrative Storage.
1-6. Destruction of Army Electronics Materiel
1-4. Reporting Equipment Improvement
Destruction of Army electronics materiel to prevent enemy
use shall be in accordance with TM 750-244-2.
If you Static Power Inverter PP-7274D/ A needs improve-
Section II. DESCRIPTION AND DATA
1-7. Purpose and Use
controls are available externally. It maybe operated in any
position and within the environmental limits of the design.
Static Power Inverter PP-7274D / A (EMP Model PS277-
A DC INPUT connector and an AC OUTPUT connector
3) converts a nominal 28 V dc input to 400 Hz, 3 phase 115
are provided for power connections. An internally mounted
V ac output, and is generally intended for use in aircraft.
fan provides cooling for the inverter.
1-9. Tabulated Data
The inverter consists of a single electronic equipment
Tables 1-1 and 1-2 contain
the electrical and physical
characteristics of the inverter.
secured in place using four nuts, two on each side. No unit