Fire hoses should be laid out and charged before
handling weapons as well as gunnery exercises, and
repair lockers should be manned and ready as
When guns are trained or elevated, an audible
warning alarm is sounded from within the gun
enclosure. All hands should stand outside the train
No ammunition or explosive assembly may be used
in any gun system for which it is not designed.
Powder cans and bags must always be in perfect
Care must be taken to avoid obliterating
identification marks on ammunition or putting it
into incorrectly marked containers.
Smokeless powder must never be exposed to the
direct rays of the sun. Powder in bulk, tanks,
cartridge cases, ammunition boxes, and other
containers must be protected against high
Smokeless powder, when wet, must be regarded as
dangerous for dry storage and must be kept
immersed completely in freshwater. It must be
turned in at an ammunition depot at the first chance
or dumped overboard.
Before any work that may cause either an
abnormally high temperature or an intense local
heat in a magazine is started, all explosives must be
removed to safe storage until normal conditions are
Pyrotechnic material must always be kept by itself
in regular pyrotechnic lockers or storage spaces.
Black powder, which is most dangerous, must
always be kept by itself. Containers of black powder
must never be opened in a magazine or adjacent to
Projectiles must not be altered, nor may fuzes or
other parts be removed from them on board ship
without instructions from higher authority.
A fuzed projectile or a cartridge case, whether in a
container or not, if dropped from a height exceeding
5 feet, must be set aside and turned in at an
ammunition depot as soon as possible. Such
ammunition must be handled with the greatest care.
Service ammunition is never used for drill; only drill
ammunition may be used.
Certain fuzes armed by setback may explode
accidentally by tapping or jarring. Extreme care
must be taken to avoid dropping them.
Care must be taken that nose fuzes are not struck (as
by the gun in recoil).
Time fuzes that have been set must be reset on SAFE
before storing below.
LEARNING OBJECTIVES: Define gun
mount. Identify the different components of a
A gun mount is the supporting structure assembly
and operating device for one or several guns. The
mounts may be open, or enclosed in a shield. Each
mount is assembled as a unit by the manufacturer, then
hoisted on board ship and bolted in place.
Modern gun mounts have been effectively
developed to meet the threat of all types of targets. They
comprise an entire system of gun-supporting parts that
enable them to rapidly load, position, and fire their
projectiles with such speed and accuracy that they have
become the backbone of the U.S. Navys support forces.
Every gun system includes equipment used for gun
positioning, loading, and firing. Loading equipment
varies greatly in design from gun to gun, but its purpose
remains the sameto load a complete round in the gun
chamber for firing. We will describe the various loading
systems later in this chapter. The greatest similarities
from one gun to the next are found in the positioning
and firing components, which we will now describe.
Positioning equipment includes all the machinery
used to support and move the gun tube to the desired
train (horizontal) and elevation (vertical) angle.
Positioning equipment includes the stand, base ring,
trunnions, carriage, and slide, (fig. 6-10).
The stand is a steel ring bolted to the deck; it serves
as a foundation and rotating surface for movement in
train. The stand contains both the train beatings and the
training circle. The training circle is a stationary internal
gear that the train drive pinion walks around to move
the gun in train.