Section I. GENERAL
3-1. Scope of Maintenance
3-2. Tools, Test Equipment, and Materials
The parts authorized for organizational
The maintenance duties assigned to the orga-
maintenance are listed in TM 11-5895-490-
nizational maintenance repairman of Receiver-
20P, Repair Parts and Special Tools List
Transmitter, Radio RT-859/APX72 and
(Army only). The tools, test equipment, and
Mountings MT-3809/APX-72 and MT-3948/
materials required for organizational main-
APX-72 are listed below together with a ref-
tenance are listed below.
erence to the paragraphs covering the specific
maintenance function. The duties include in-
spection, testing, and servicing instructions for
Tool Kit, Electronic Equipment TK
performing preventive maintenance services,
GO/NO-GO performance tests, and replace-
b. Test Equipment.
ment of entire unit if found defective. These
(1) Multimeter AN/USM-223, or equiva-
procedures do not require special tools or test
equipment other than those allocated in para-
(2) Test Set, Transponder AN/APM-
(3) Adapter, UG-1108/U.
a. Intermediate preventive maintenance
(4) Pump, Dehydrator, Manual MK
checks and services (para 3-4).
20A/UP (if required).
b. Cleaning (para 37).
c. Touchup painting instructions (para 38).
(1) Fine sandpaper No. 000.
(2) Clean, dry, lint-free cloth.
d. Power-on inspection (para 3-9).
(3) Soft bristle brush.
e. Periodic preventive maintenance checks
(4) Cleaning compound, FSN 7930-395-
and services (para 3-15).
f. General troubleshooting (para 3-17).
(5) Paint, enamel, lusterless gray, Fed-
eral Standard 595, color 36231.
g. Removal and replacement (para 3-19).
Section Il. PREVENTIVE MAINTENANCE CHECKS AND SERVICES
would probably fail before the next scheduled
3-3. Preventive Maintenance
periodic service. Preventive maintenance checks
Preventive maintenance is the systematic
and services of the RT859/APX-72, MT
care, inspection, and servicing of equipment to
3809/APX72, and MT3948/APX-72 at the
maintain it in a serviceable condition, prevent
organizational maintenance level, are made at
breakdown, and assure maximum operational
intermediate and periodic intervals unless
capability. Preventive maintenance is the re-
otherwise directed by the commanding officer.
sponsibility of all categories of maintenance
The maintenance services should be performed
concerned with the equipment and includes the
concurrently with the inspection schedules of
inspection, testing, and replacement of parts
or units that inspection and checks indicate