TM 3-4240-212-14&P
CHAPTER 4
ORGANIZATIONAL MAINTENANCE
Section I. SERVICE UPON RECEIPT OF MATERIAL
(4) Spanner wrench.
4-1. Servicing New (or Used)
(5) Antifogging kit.
Equipment.
(6) Instruction card.
a. Remove M20 breathing apparatus from carrying
c. Install the timer and bracket assembly on the ap
-
case.
paratus if it has not been installed previously (para 4-10).
d.
Perform preventive maintenance checks and
included with the apparatus:
services.
(1) Hood
(2) Canisters (three).
e. Correct or report all defects.
(3) Technical manual.
f. Return M20 breathing apparatus to carrying case.
Section II. PREVENTIVE-- MAINTENANCE CHECKS AND SERVICES
NCO or Officer.
4-2. General
The preventive-maintenance checks and services (table
4-3. Explanation of Columns
A number In the sequence number column Indicates the
must be performed at the intervals prescribed. Use the
numerical sequence in which the service opposite the
list to make sure that all required maintenance is ac-
number must be performed. Time required to perform the
complished. If corrective action Is not authorized at
monthly checks and services is listed in man-hours
organizational level, report equipment defects to your
(elapsed time).
Table 4-1. Organizational Preventive Maintenance Checks and Services
Monthly schedule
Total man-hours required: 2.9
Work
Sequence
Item to be inspected
time
number
procedure
(M/H)
Section I-Facepiece Group
Man-hours required: 1.2
1
LENSES
Inspect for scratches, chips, or breaks
0.1
Replace, If necessary
0.2
2
FACEBLANK
Inspect for cracks, leaks, cuts, and signs of deterioration.
If found, notify higher maintenance
0.1
3
BREATHING TUBES
Inspect for damage, cuts, or deterioration
0.1
Replace faulty components (para 4-7)
0.3
4
HEAD HARNESS
Inspect for broken straps, deterioration, or loss of resiliency
0.1
Replace (para 4-5)
0.1
5
PRESSURE RELIEF VALVE
Insure that valve operates freely
0.1
Replace defective components (para 4-8)
0.1
SECTION II-- Backplate Assembly and Harness Assembly
Man-hours required. 1.1
6
BREATHING BAG
Inspect for holes, tears, and signs of deterioration If found, notify higher maintenance
0.1
7
BAIL ASSEMBLY
Be sure that handwheel turns freely Inspect for damage or corrosion.
If found, notify higher
0.1
Change 2 4-1
