FIELD LEVEL PREVENTIVE MAINTENANCE CHECKS AND SERVICES (PMCS)

DRAFT

TB 9-2320-279-13-1

0008

FIELD LEVEL PREVENTIVE MAINTENANCE CHECKS AND SERVICES (PMCS)

INTRODUCTION

This work package contains Field Level Maintenance PMCS requirements for the HEMTT AC system. These

PMCS requirements are in addition to those listed in TM 9-2320-279-20. The PMCS tables contain checks and

services necessary to ensure that the AC system is ready for operation. Using PMCS listed tables, perform

maintenance at specified intervals. Perform PMCS listed in TM 9-2320-279-10, TM 9-2320-279-20, and Chapter 2

before performing these PMCS checks.

GENERAL MAINTENANCE PROCEDURES

WARNING

Dry cleaning solvent is TOXIC and flammable. Wear protective goggles and gloves;

use only in a well-ventilated area; avoid contact with skin, eyes, and clothes; and

DO NOT breathe vapors. Keep away from heat or flame. Never smoke when using

dry cleaning solvent; the flashpoint for Type II is 140F (60C), and for Type III it is

200F (93C). Failure to follow this warning may result in death or injury to

personnel.

If personnel become dizzy while using cleaning solvent, immediately get fresh air

and medical help. If solvent contacts skin or clothes, flush with cold water. If

solvent contacts eyes, immediately flush eyes with water and get immediate

medical attention.

Use care to prevent refrigerant from touching skin or eyes. Liquid refrigerant, when

exposed to air, quickly evaporates and will freeze skin or eye tissues. Use care to

prevent refrigerant from touching your skin or eyes. Serious injury or blindness

may result if you come in contact with liquid refrigerant.

Refrigerant R-134a air conditioning systems should not be pressure tested or leak

tested with compressed air. Combustible mixtures of air and R-134a may form,

resulting in fire or explosion, which could cause personnel injury or death.

a. Cleanliness. Dirt, grease, oil, and debris may cause or cover a serious problem. Use dry cleaning solvent

(Item 8, Appendix E) on metal surfaces and soapy water on rubber items.

b. Bolts, nuts, and screws. Check bolts, nuts, and screws for obvious looseness, missing, bent, or broken

condition and tighten or replace as necessary. If they cannot be checked with a tool, look for chipped paint, bare

metal, or rust around bolt heads.

c. Welds.

Look for loose or chipped paint, rust, or gaps on welds. If a bad weld is found, notify supervisor.

d. Electrical wires and connectors. Look for cracked or broken insulation, bare wires, and loose or broken

connectors. Tighten loose connectors and ensure wires are in good shape.

e. AC system leaks. Look for air conditioner lubrication leakage and corrosion, and damage to fittings,

hoses, and other components. Inspect lowest points of fittings and hoses for indication of lubrication leakage.

f. Damage. Damage is defined as any condition that affects safety or would make the AC system

unserviceable for mission requirements.