45. Organizational Preventive Maintenance
a. Preventive maintenance is the responsibility of all echelons
concerned with the equipment and includes the inspection, test-
ing, and repair or replacement of parts, subassemblies, or units
that inspection and tests indicate would probably fail before the
next scheduled periodic service. Preventive maintenance checks
and services of Projector PH-637 (*) /PFP are made at a monthly
interval at the same time that the daily (par. 39) and weekly
(par. 40) checks and services are made, unless otherwise directed
by the commanding officer.
b. Maintenance forms and records to be used and maintained
on this equipment are specified in TM 38-750.
46. Monthly Maintenance
Perform the maintenance functions indicated in the monthly
preventive maintenance checks and services chart (par. 47)
once each month. A month is defined as approximately 30 cal-
endar days of g-hour-per-day operation. If the equipment is op-
erated 16 hours a day, the monthly preventive maintenance
checks and services should be performed at 15-day intervals. Ad-
justment of the maintenance interval must be made to compen-
sate for any unusual operating conditions. Equipment maintained
in a standby (ready for immediate operation) condition must have
monthly preventive maintenance. Equipment in limited storage
(requires service before operation) does not require monthly
maintenance. All deficiencies and shortcomings will be recorded
in accordance with the requirements of TM 38-750.
47. Monthly Preventive Maintenance Checks and Services
See that the equipment is
properly installed (par.
a. Check all painted sur-
faces to be sure that
they are free of bare
spots, rust, and cor-
b. Remove rust and corro-
b. TM 9-213.
sion by lightly sand-
ing them with fine
sandpaper. Brush two
thin coats of paint on