OPERATOR AND ORGANIZATIONAL MAINTENANCE INSTRUCTIONS
Section l. TOOLS AND EQUIPMENT
the operator and organizational technician are
listed in appendix C.
Tools and test equipment authorized for use by
Section II. PREVENTIVE MAINTENANCE CHECKS AND SERVICES
deficiencies together with the corrective action
taken as prescribed in TM 38-750.
To be sure that the ZM-21(*)/U is always ready
for operation, it must be inspected systematically
4-3. Preventive Maintenance Checks and Services
so that defects may be discovered and corrected
before they result in serious damage or failure. The
Preventive maintenance checks and services of the
necessary preventive maintenance checks and
ZM-21(*)/U are required daily, weekly, monthly,
services to be performed are listed and described in
and quarterly. In addition, the weekly preventive
maintenance checks and services must be per-
sequence of minimum inspection requirements.
formed under the following conditions:
Defects discovered during operation of the unit will
a. Upon initial receipt.
be noted for future correction to be made as soon
b. Upon return from higher category main-
as operation has ceased. Stop operation im-
mediately if a deficiency is noted during operation
which would damage the equipment. Record all
Table 4-1. Operator/Crew Preventive Maintenance
Checks and Services.
Time required: 0.4
Time required: 0.2
ITEM TO BE INSPECTED
Check to see that the ZM-21(*)/U is complete against the component listing
Check to see that exterior is clean and free from dust, dirt, fungus, rust, and
Check to be sure that all screws and handles are securely fastened.
Check for loose clips and terminals, cleanliness of terminals, and breaks in
While the ZM-21(*)/U is in operation, be alert for symptoms of trouble.