Confidential NAVAIR 11-15-4. The decoy flare (fig.
4-10) consists of a cylindrical aluminum case about 5.8
inches long and 1.42 inches in diameter. The base end
of the flare is flanged to a maximum diameter of 1.495
inches to fit the counterbore in the chamber of the
dispenser. There are 30 such chambers in each
AN/ALE-29A, 60 in each AN/ALE-39, and 240 in each
AN/ALE-37A Dispenser. The end of the flare case
opposite the flanged base is closed with an aluminum
closure disk.
When properly installed in the chamber of a
dispenser, the cartridge retainer fits snugly over and
around the firing end of a corresponding Mk 131 or
CCU-63/B impulse cartridge. When the cartridge is
fired, gas pressure causes the hammer to move into the
adapter, locking the adapter and the piston together.
Gases from the fired cartridge expand to exert a pushing
force against the piston. This removes the closure disk
and ejects the flare grain. As the piston strikes the
piston stop, the adapter to which the pull wire is firmly
attached separates from the igniter cup. Then, the
adapter travels with the flare grain. This action causes
the igniter to move over the friction material on the
crinkled end of the pull wire, igniting the ignition
composition. Flame flashes through the longitudinal
hole in the flare grain and ignites the first-fire
composition in both the longitudinal hole and the
cross-hole. The first-fire composition ignites the flare
grain on all surfaces.
The segmented adapter renders the flare safe
during normal handling operations. If the closure disk
is accidentally displaced the entire grain and the igniter
assembly slips out of the flare case without igniting.
The device arms only after an impulse cartridge is fired
and bends the sharpened edges of the adapter so it is
locked to the piston.
REVIEW NUMBER 3 ANSWERS
A1.
The burn time of the Mk 25 Mods 2 and 3
marine location markers is between 10 and
20 minutes.
A2.
The Mk 25 Mods 2 and 3 marine location
markers function in the same way. Mod 2
contains two saltwater-activated batteries
and two related squibs. Mod 3 contains one
battery and one squib.
A3.
The heavy aluminum base assembly crimped
to the outer tube sits in the water and causes
the candle to sit out of the water.
A4.
The Mk 25 and Mods marine location marker
is launched by hand or by sonobuoy launcher.
4-12
Figure 4-10.—Mk 46 Mod 1C, MJU-8/B, A/B, MJU-22/B, SM 875/ALE and chaff package.
