Figure 22. Beacon Off-Current Test Set-Up ................................................................... 21
03-TM-0037 REV 13
Page 4 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 beacons have been tested to, and meet, or exceed, all
requirements of FAA TSO-C121.
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
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-STD12, 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
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 beacon. Figure 1 shows the beacon mounted in the
N30A21A Mounting Kit, a strap-type mount. This
mount is used for applications where space limitations do not permit the use of the simpler N30A26
Series cradle mount.
1.2.3. BEACON SIGNAL. The beacon is a battery-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 Specifications are listed on page 6 and 7.
Storage Temperature Range..................................
4.9 ounces (139 grams)
3.5 ounces (99 grams)
3 ounces (85 grams)
-65°F (-54°C) to 160°F (71°C)
1.2.5. ENVIRONMENTAL TEST. The beacon complies with the preceding operational performance
standards after being subjected to environmental tests specified in FAA TSO-C121.
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Page 7 of 24
SECTION II
INSTALLATION
2.1. GENERAL.
This section describes the installation of the
beacon mounting kits and the installation of the
DK Series beacons into these mounts.
2.2. INSTALLATION CRITERIA OF THE
BEACON.
NOTE
All installations to Cockpit Voice Recorders and Flight Data Recorders should be in
accordance with the recorder manufacturer’s
approved procedures and hardware.
2.3. SURVIVABILITY.
2.3.1. The beacon location should minimize the
probability of physical damage to the device
during water impact. The aft mid-section of the
aircraft is normally the most desirable location
for the beacon, but consideration must be given
to environmental conditions outlined in Section
2.4.
2.3.2. The area selected for the beacon mounting
should be free of the possibility of heavy equipment tearing loose and striking the device.
2.4.2. The beacon is a battery-powered device
and installed shelf life is affected by higher than
normal temperatures. Maximum temperature
must not exceed 160°F (71°C).
2.4.3. Inadvertent actuation of the water switch
by any source of water, such as rain, salt spray,
melting ice or snow, head or washroom overflow, foods and beverages, must be avoided.
2.4.4. In order to avoid accumulation of moisture
on the water-switch, the device should be
mounted with the long axis of the beacon horizontal or with the water-switch facing down. A
clean switch will allow moisture to collect into
droplets and run off the switch, without activating the beacon.
2.4.5. Honeycomb structure, tarpaulin fabrics,
clothing, parachutes, cargo, etc., are soundabsorbing materials. Do not surround the device
with these materials and if necessary, remove
small areas of such materials from the immediate
vicinity.
2.4.6. Any compartment that may not be expected to flood under light impact should not be
used. Direct contact between the beacon case and
water is necessary for actuation and acoustic
radiation.
2.3.3. Installation should be made to a substan-
tial structural member, but kept as simple as
possible and must not weaken the structural
member.
2.4. ENVIRONMENTAL.
2.4.1. The DK Series beacon must not be disas-
sembled, crushed, penetrated, incinerated or
exposed to temperatures above 160°F (71°C).
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2.5. MAINTENANCE
In addition to observance of the preceding
mandatory considerations, where possible the
selection of a mounting location should provide
for convenient beacon access during inspection
intervals. The proper mounting location should
also provide for clearance for removing the
beacon from its mounting cradle.
Page 8 of 24
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