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03-TM-0037 REV 13
Page 5 of 24
SECTION I
GENERAL INFORMATION
1.1. INTRODUCTION.
1.1.1. GENERAL. This manual contains the de-
scription, theory, installation and maintenance for
the DK100/DK120/DK130/DK140 Underwater
Acoustic Beacon, hereafter referred to as the “DK
Series”, manufactured by Dukane Corporation,
Seacom Division, 2900 Dukane Drive, St. Charles,
Illinois, 60174. See Figures 1 and 2. These bea-
cons have been tested to, and meet, or exceed, all
requirements of FAA TSO-C121.
Figure 1. DK Series Underwater
Acoustic Beacon Installed in
Mounting Kits
1.1.2. SYMBOLS AND ABBREVIATIONS.
Symbols and abbreviations used in this manual are
in accordance with ANSI Y14.15 and MIL-STD-
12, respectively.
1.2. GENERAL DESCRIPTION.
1.2.1. PHYSICAL CHARACTERISTICS. The
DK Series beacons consist of a self-contained
battery, an electronic module and a transducer. It
is housed in a cylindrical watertight aluminum
case capable of withstanding high-G impact
shock and deep-water immersion. As shown on
page 6 and 7, the DK Series beacons operate for
30 days when immersed in water. See Figure 2.
Figure 2. Water Switch Location on
Beacon
1.2.2. BEACON MOUNTING. The beacon is
mounted to a flight recorder or the airframe by
means of a mounting kit (See Section II). This
mount consists of an extruded channel, which in
conjunction with a securing plate retains the bea-
con. Figure 1 shows the beacon mounted in the
N30A21A Mounting Kit, a strap-type mount. This
mount is used for applications where space limita-
tions do not permit the use of the simpler N30A26
Series cradle mount.
1.2.3. BEACON SIGNAL. The beacon is a bat-
tery-powered device, which radiates a pulsed
acoustic signal into the surrounding water upon
activation by its water-sensitive switch. Search
operations in water for beacon equipped aircraft
can be conducted by utilizing a portable receiver
equipped with a directional hydrophone such as
the Dukane Model N30A5 Series Locator. This
receiver system is operable from small boats or by
free-swimming SCUBA divers. Aircraft lost in
deep water, i.e., in excess of 6000 feet (1829
meters), require special search gear. Beacon Speci-
fications are listed on page 6 and 7.