The Mk 58 Mod 1 marine location marker consists
of a cylindrical tin can approximately 21.78 inches long
and 5.03 inches in diameter. The can contains two
pyrotechnic candles of a red phosphorus composition.
The ignition end of the marker has three holestwo for
smoke and flame emission and one for water to enter
the Mk 72 Mod 1 seawater-activated battery. Adhesive
foil disks hermetically seal the two emission holes. A
reinforced adhesive foil strip with a rectangular pull
ring hermetically seals the battery cavity hole. The
adhesive foil seals are protected during handling and
shipping by a replaceable polyethylene protective
The Mk 58 Mod 1 marker may be hand launched,
externally launched from suitable aircraft bomb racks
by using breakaway suspension bands, or launched
from sonobuoy launchers by using a sonobuoy launcher
container (SLC) and the appropriate foam spacer. No
matter how the marker is launched, the protective cover,
the pull ring, and reinforced adhesive foil strip over the
batterys cavity is removed.
When launching the marker from a sonobuoy
launcher, you remove the protective cover and pull ring
and reinforced adhesive foil strip. Then, load the
marker onto the bomb rack. After securing the marker
to the bomb rack, attach the pull ring to an arming wire,
which is attached to the bomb rack. When the marker is
released from the bomb rack, the arming wire retains
the pull ring and removes the foil strip covering the
battery's cavity. When submerged, the Mk 72 Mod 1
battery is activated by seawater. Current from the
battery initiates a Mk 13 electric squib, which ignites
the starter composition of the first pyrotechnic candle.
The composition ignites the starter pellet, which, in
turn, ignites the first candle. When the first candle is
nearly burned out, its heat ignites the transfer time fuze,
which carries ignition to the second candle starter
composition. This starter composition initiates the
second pyrotechnic candle.
REVIEW NUMBER 3
What is the burn time of the Mk 25 Mods 2
and 3 marine location markers?
The Mk 25 Mods 2 and 3 marine location
markers function in the same way. Describe
the difference between them.
What is the purpose of the heavy aluminum
base assembly crimped to the outer tube?
List the methods used to launch the Mk 25 and
Mods marine location markers.
What adapter kit is used when the Mk 25 and
Mods marine location markers are launched
from sonobuoy launchers?
List the uses of the Mk 58 Mod 1 marine
The Mk 58 Mod 1 marker produces a yellow
flame and white smoke for what length of
Under normal conditions, the flame and/or
smoke of the Mk 58 Mod 1 marker is visible
List the methods used to launch the Mk 58
Mod 1 marine marker.
What seawater-activated battery is used with
the Mk 58 Mod 1 marker?
LEARNING OBJECTIVE: Identify the pur-
pose and use of decoy devices.
mechanisms on aircraft. They are fired during evasion
The Mk 46 Mod 1C decoy flare is loaded into and
launched from the AN/ALE-29A, AN/ALE-37A, or
AN/ALE-39 Dispensing Set for purposes as set forth in