TM 55-4920-221-14
Intervals
Before
During
After
Operation
Operation
Operation
Procedure
X
X
X
Meters. Inspect meters for zero adjustment, improper operation, and
cracked or broken glass. Correct deficiencies or report them to
organized personnel.
X
X
X
Indicator lamps. Inspect indicators for cracked or broken lens. Correct
or report deficiencies to organizational maintenance.
X
X
Fuses. Inspect fuses for burned out or corroded condition. Report
deficiencies to organizational personnel.
X
X
X
Switches. Check switches for improper operation. Report deficiencies
to organizational personnel.
X
X
X
Terminals. Inspect terminals for damaged threads, broken or missing
thumb knobs and secure mounting. Correct or report deficiencies
to organizational personnel.
are listed and described below. Indicated items and
84. ORGANIZATIONAL MAINTENANCE.
instructions constitute minimum inspection requirements
Preventive maintenance service is performed
for unit.
by organizational maintenance personnel at 1, 6, and 8
month intervals. Service performed at these intervals
85. PREVENTIVE MAINTENANCE SERVICES.
Intervals
Monthly
6-Month
8-Month
Procedure
X
X
X
Before-operational services. Check and perform services listed in para-
graph 88.
X
X
X
Appearance. Inspect general appearance of unit, paying particular
attention to cleanliness, illegibility of identification markings, and
condition of paint. Correct deficiencies or report to proper authority.
X
X
X
Tools and equipment. Inspect condition of tools and equipment assigned
to unit, ensuring they are clean, serviceable, and properly stowed or
mounted.
X
or loose electrical connections, and cracked or broken lens. Clean and
tighten electrical connections replacing meter having cracked or
broken lens.
X
Report damage or inoperative meter to proper authority.
X
Switches. Check switches for corroded or loose electrical connections, and
for weak or sluggish spring action. Clean and tighten loose or
corroded electrical connection. Report defective switch to field mainte-
nance.
X
Rheostats. Check rheostats for loose electrical connections, tight or bind-
ing shaft and pointer not zeroed. Clean and tighten electrical con-
nections, and zero pointers, as required. Report damaged or defective
rheostat to field maintenance.
X
Terminals. Check terminals for secure mounting, loose or corroded
electrical connections, and damaged threads.
X
Clean and tighten electrical connections, and replace missing knobs. Report
defective terminal to field maintenance.
X
Connection board. Check connection board for loose or corroded electrical
connections, and for damaged link terminals. Clean and tighten
electrical connections.
20