PREVENTIVE MAINTENANCE CHECKS AND SERVICES FOR SINCGARS RADIOS (CONT)

TM 11-5820-890-10-8

Item

Item to

Operator

Not Fully Mission

When

Check/Service

Procedure

Capable IF:

Before

DATA LOADING:

SC Freq

Load SC freq.

SC freq will not load.

COMSEC key

Load COMSEC key.

COMSEC key will not load.

FH data

Load FH data.

FH data will not load.

Sync time

Load sync time***

Sync time will not load.

(electronic or

manual).

Before

COMM

During

CHECK:****

Check for sidetone.

Sidetone is not heard.

After

Voice/data

Check voice comm

Cannot communicate in

SC mode

in SC- PT and

SC-PT or FH-CT, voice

FH mode

FH -CT (check SQ

mode.

Plain text

OFF while in SC

Cipher text

mode).

Cannot communicate in

RXMT mode

If data comm is

mission-required data mode

mission-required,

using mission-related data

check data comm in

device.

FH -CT using

mission-related

data device.*****

Cannot retransmit in

If RXMT is

mission-related modes.

mission-required,

check RXMT in all

mission - related

modes.

"Does not function properly" means that a control will not do what it is intended to do,

for example, turning the FCTN knob does not change the radio's function. it may be necessary to

wait until item 8 (Communications Check) to determine for sure that some controls do or do not

function proper/y.

"Damaged and cannot be used" means that after visual inspection or operational

check you determine that a piece of equipment, for whatever reason, is faulty and will not support

your mission requirements or presents a safety hazard.

***

Use of the ICOM fill procedure is appropriate here, but separate checks of COMSEC

keys, FH data, and sync time elements are required.

****

Operators having special requirements (NCSs for example) should check those

functions that are important to mission operations (ERF for example). Skip this step if unit SOP or

the tactical situation prohibits transmitting.

*****

Unless your mission is likely to require use of data mode or retransmission operations,

you do not need to perform these two checks.

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