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Page Title: Section IV. OPERATION UNDER UNUSUAL CONDITIONS
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(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
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
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.
Change 1 2-27/(2-28 blank)

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