Section IV. OPERATION UNDER UNUSUAL CONDITIONS

ARMY

TM 9-6650-235-13&P

MARINE CORPS

TM-08552A-13&P

2-9. PREPARATION FOR MOVEMENT (CONT).

WARNING

careful

when

Disassemble the components of the M3

engaging/disengaging the two pieces

Borescope by depressing the respective lock assemblies

of the objective tube assembly or

and removing the components.

Place all the

borescope extension tubes to avoid

components into the borescope optical case. Close and

pinching the thumb.

lock the borescope optical case.

NOTE

There is no required order for

disassembly of the remaining M3

Borescope components.

Section IV. OPERATION UNDER UNUSUAL CONDITIONS

2-10. GENERAL.

2-11.

OPERATION IN EXTREME COLD WEATHER

CONDITIONS.

a. This section contains special instructions for

operating and servicing the M3 Borescope under unusual

a. Extensive preparation of materiel scheduled for

conditions. Special care must be taken in cleaning and

operation in extreme cold weather is necessary.

handling when extremes in temperature, humidity, and

Generally, extreme cold weather will cause clouding of

terrain conditions are present or anticipated, in addition

the optical components of the M3 Borescope and the

to performing all normal preventive maintenance

formation of moisture on the metallic components. For

services. Proper cleaning, storage, and handling not only

description of operation in extreme cold weather, refer to

ensure proper operation and functioning, but also guard

FM 9-207.

against excessive wear of the working parts and

deterioration of the materiel.

b. No lubrication of the M3 Borescope is required.

b. A pressure release valve is provided on the side

2-12.

OPERATION IN HOT, DAMP, OR SALTY

of the borescope optical case to release pressure

ATMOSPHERE.

accumulated in the borescope optical case due to

extreme hot weather. At temperatures above 90F, use

a. Materiel should be inspected daily when being

your finger to press the center of the pressure relief valve

operated in hot, moist, or salty areas.

to equalize the pressure inside the borescope optical

case.

b. When the materiel is active, clean the lenses

and exposed metal surfaces daily.

2-18