Table 4-2. SEMI-ANNUAL UNIT PREVENTIVE MAINTENANCE CHECK AND SERVICES

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

Air free flow (won't

a. Purge button (fig. 4-2) (2) jammed

a. Remove and clean. (Section Ill,

shut off).

open.

para 4-7).

b. Lever (fig. 4-2) (18) set too high.

b. Readjust lever (18), (Section V,

para 4-14c).

c. Lever (fig. 4-2) (18) bent

c. Replace lever (18).

d. First stage regulator failure

d. Replace first stage regulator

(fig. 4-1).

disc and retainer (14),

(Section V, para 4-13b).

4-3