TB 5-4220-200-12-1
Table 4-2. SEMI-ANNUAL UNIT PREVENTIVE MAINTENANCE CHECK AND SERVICES
TOTAL MANHOURS REQUIRED 0.2
Work
Sequence
Functions to be Performed
Number
Time
Procedure
M/H
0.5
PRESSURE GAUGE TEST
Test gauges in accordance with a Master Reference Gauge. Refer to
0.2
TB 9-6685-319-50, "Calibrating Procedures for Indicating Dial Gauges". If meter ac-
curacy is not within tolerance level prescribed in , Section VII. paragraph 4, dispose of
pressure gauge and replace with a new one.
NOTE
The master reference gauge shall be calibrated annually in accor-
dance with TB 43-180, "Calibration Requirements for the Maintenance
of Army Material."
Section IV. TROUBLESHOOTING
4-10 GENERAL.
This section contains troubleshooting information for locating and correcting the operating troubles which may de-
velop in the Open Circuit SCUBA System. Each malfunction for an individual component or system is identified by
a list of probable causes and corrective actions to be taken to restore the component or system to an operational
status. Perform the test/inspections according to the cited references.
4-11 TROUBLESHOOTING INSTRUCTIONS.
Refer to Table 4-3. This table provides troubleshooting instructions for the unit maintenance level.
NOTE
Before you use this table, be sure you have performed all applicable operating
checks.
Table 4-3. TROUBLESHOOTING - UNIT
A. AIR DEMAND REGULATOR TROUBLESHOOTING INSTRUCTIONS
ITEM
NO.
MALFUNCTION
PROBABLE CAUSE
CORRECTIVE ACTION
1
Air free flow (won't
a. Purge button (fig. 4-2) (2) jammed
a. Remove and clean. (Section Ill,
shut off).
open.
b. Lever (fig. 4-2) (18) set too high.
b. Readjust lever (18), (Section V,
c. Lever (fig. 4-2) (18) bent
c. Replace lever (18).
d. First stage regulator failure
d. Replace first stage regulator
disc and retainer (14),
(Section V, para 4-13b).
4-3
