Section IV. OPERATION UNDER UNUSUAL CONDITIONS

(3) Cookoff: A cookoff is a functioning of

bore, receiver, breech bolt, and firing pin with lubricant

and preservative cleaner (CLP), making certain that all

any or all of the components of a cartridge chambered in

surfaces are well coated. Do not wipe dry. On the third

a very hot trainer due to the heat from the trainer. If the

day after firing, clean with CLP, wipe dry (using clean

cartridge propellant should cookoff, the projectile will be

propelled from the trainer with normal velocity even

lintfree cloth), and coat I lightly with CLP.

though no attempt was made to fire the primer by

actuating the firing mechanism. In such case, there may

b. Clean all exposed surfaces of the trainer,

be uncertainty as to whether or when the cartridge will

and lubricate in accordance with paragraph 3-4.

fire, and precautions should be observed the same as

those prescribed for hangfire. To prevent a cookoff, a

c. Disassemble the trainer in reverse

cartridge which has been loaded into a very hot trainer

sequence as indicated in paragraph 2-6, and replace in

should be fired immediately, or removed after a lapse of

shipping and storage chest.

5 seconds and within 10 seconds.

d. Remove subcaliber device in reverse order

2-15.

Services after Firing.

of applicable installation paragraph (see para. 2-7 through

2-10.1).

a. Immediately after firing and on two

consecutive days thereafter, thoroughly clean the barrel

Section IV. OPERATION UNDER UNUSUAL CONDITIONS

b. Protect the materiel when not in use. Keep

2-16.

General.

snow and ice from the controls. Provide as much

protection as possible.

a. Operational procedures for the trainer or

c. When the materiel is brought from a cold

subcaliber device under unusual conditions are the same

temperature to a heated area, it should be wrapped in a

as under usual conditions (para. 2-12 through 2-15).

covering of sufficient thickness to allow it to reach 'room

Special instructions for servicing the trainer or subcaliber

temperature' gradually.

device under unusual conditions are contained herein. In

d. If a materiel is brought into a warm area

addition to the normal preventive maintenance services,

and condensation forms, it must be thoroughly cleaned

special care in cleaning must be observed where

and dried as soon as it reaches room temperature. If

extremes of temperature, humidity, and atmospheric

materiel is taken into below freezing temperatures before

conditions are present or anticipated. Proper cleaning

it is thoroughly cleaned and dried, ice will form in its

and handling guards against excessive wear and

mechanisms, making it inoperative.

deterioration of the materiel. b. When chronic failure of

materiel results from subjection to extreme conditions,

2-18.

Operation in Hot Climates.

report of such failure should be made in accordance with

paragraph 1-2.

a. In hot climates, the film of oil necessary for

operation and preservation will be quickly dissipated and

should be renewed more frequently. Inspect the materiel

2-17.

Operation in Cold Climates.

more frequently, paying particular attention to hidden

surfaces (the bore, receiver, and like places), where

a. Special preparation of materiel scheduled

corrosion might occur and not be quickly noticed.

for operation in extreme cold weather is necessary.

b. Perspiration is a contributing factor to

Extreme cold will cause lubricants to thicken or congeal,

rusting because it contains acids and salts. After

which will impair operation of the trainer. Lubricate the

handling, clean, wipe dry, and restore oil film.

materiel for operation in cold climates according to

instructions in FM 9-207.

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