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TM 11-6625-2611-12

CHAPTER 4

OPERATOR/CREW MAINTENANCE INSTRUCTIONS

4-1. Tools and Equipment

The following test equipment is required for organiza-

tional maintenance:

a. Multimeter AN/USM-223.

b. Oscilloscope AN/USM-281A or oscilloscope

AN/USM-281C.

C. Tools. Tools required for organizational mainte-

nance are included in standard issue Tool Kit,

Electronic Equipment TK-105/G.

4-2. Lubrication

Lubrication of the test set is not required.

4-3. Preventive Maintenance Checks and

Services

To insure that Transponder Set AN/APM 305 A is al-

ways ready for operation, it must be inspected

systematically so that defects may be discovered and

corrected before they result in serious damage or

failure. The necessary preventive maintenance checks

and services to be performed are listed and described in

table 4-1. The step numbers indicate the sequence of

and minimum inspection required. Defects discovered

during operation of the unit will be noted for future

correction to be made as soon as operation has ceased.

Stop operation immediately if a deficiency is noted

during operation which would damage the equipment.

Sequence

No.

Item to be

Inspected

Exterior surfaces

Controls and indicators

Operation

Record all deficiencies together with the corrective ac-

tion taken on forms per TM 38-750. Instructions for

performing the required checks are identified as

periodic checks.

4-4. Preventive Maintenance

These checks and services are to maintain electronic

equipment in a combat serviceable condition; that is, in

good general (physical) condition and in good operating

condition. To assist operators in maintaining combat

serviceability, the charts indicate what to check, how to

perform the check and what action to take to correct a

faulty indication. The Reference column lists the illus-

tration, paragraph, or other manual that contains

detailed repair or replacement instructions. If the

defect cannot be remedied by performing the corrective

action indicated, a higher category of maintenance is

required.

4-5. Preventive Maintenance Checks and

Services Periods

Preventive maintenance checks and services for the

test set are required daily, weekly, and quarterly.

4-6. Daily Preventive Maintenance Checks

and Services

The following chart specifies checks and services that

must be accomplished daily.

Procedure

Clean exterior surfaces including test set panel as-

sembly.

During operation of test set, observe that each con-

trol and indicator functions properly. Mechani-

cal action of each knob, dial, and switch should

be smooth and

free

of external or internal bind-

ing. Tighten loose controls as required.

When operating test set, be alert for

any unusual

performance or condition.

Reference

Para 5-2

None

4-7. Weekly Preventive Maintenance

must be accomplished weekly or at least once each

Checks and Services

month if the test set is not used periodically.

The following chart specifies checks and services that

Sequence

No.

Item to be

Inspected

Completeness

Exterior items

Cables

Connectors

Handles, latches, and hinges

Metal surfaces

Procedure

POWER OFF lNSPECTION

See that equipment is complete.

Check for looseness of exterior items, such as con-

nectors, switches, and latches. Tighten all loose

mounting screws and nuts.

Check cables for breaks, cuts, kinks, fraying, and

broken connectors; replace defective cables.

Inspect connectors for snug fit and good contacts.

Check handles, Iatches, and hinges for looseness

and defects.

Check all exposed metal surfaces for rust and cor-

Reference

Para 1-12

None

Higher category maintenance required

Para 5-3

4-1

1 2 ... 24 25 26 27 28 29 30 31 32 33 34 ... 58 59

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