Table 4-2. SEMI-ANNUAL UNIT PREVENTIVE MAINTENANCE CHECK AND SERVICES
TOTAL MANHOURS REQUIRED 0.2
Functions to be Performed
PRESSURE GAUGE TEST
Test gauges in accordance with a Master Reference Gauge. Refer to
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.
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
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.
Before you use this table, be sure you have performed all applicable operating
Table 4-3. TROUBLESHOOTING - UNIT
A. AIR DEMAND REGULATOR TROUBLESHOOTING INSTRUCTIONS
Air free flow (won't
a. Remove and clean. (Section Ill,
b. Readjust lever (18), (Section V,
c. Replace lever (18).
d. First stage regulator failure
d. Replace first stage regulator
disc and retainer (14),