Dukane Seacom DK100 User manual

03-TM-0037 REV B Page 1 of 24
DUKANE SEACOM, INC. SARASOTA, FLORIDA 34243 PHONE: [phone] FAX: [phone]
DOCUMENT NO. 03-TM-0037 © DUKANE SEACOM, INC.
INTERNET: www.dukaneseacom.com
NOVEMBER 13, 2017
REV B
TECHNICAL MANUAL
UNDERWATER ACOUSTIC BEACON
MODELS DK100/DK120/DK130/DK140
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03-TM-0037 REV B Page 2 of 24
This manual should be read in its entirety prior to
any installation, operation, testing or maintenance
of the DK100/DK120/DK130/DK140 Underwater
Acoustic Beacons.
The information contained in this manual is intended to
assist with the installation, maintenance, and use of the
models DK100/DK120/DK130/DK140 Underwater
Acoustic Beacon when attached to an aviation data
recorder. For other applications of these products
please contact the factory for information regarding
the warranty, installation, maintenance, and use.
VALIDATION OF OPERATIONS DESCRIBED IN THIS MANUAL
The maintenance operations described in this manual have been checked in
manufacturer's workshops by an exact carrying out of dismantling, reassem-
bly, test and repair instructions which are detailed in this document.
These operations are those in use at the latest revision date of the document.
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03-TM-0037 REV B Page 3 of 24
TABLE OF CONTENTS
SECTION I ........................................................................................................................................... 5
GENERAL INFORMATION ................................................................................................................ 5
1.1. INTRODUCTION. ................................................................................................................................ 5
1.2. GENERAL DESCRIPTION. ................................................................................................................................ 5
SECTION II .................................................................................................................................... 8
INSTALLATION ................................................................................................................................................ 8
2.1. GENERAL. ............................................................................................................................................. 8
2.2. INSTALLATION CRITERIA OF THE BEACON. .............................................................................................. 8
2.3. SURVIVABILITY. ................................................................................................................................................. 8
2.4. ENVIRONMENTAL. ........................................................................................................................... 8
2.5. MAINTENANCE. ................................................................................................................................. 8
2.6. INSTALLATION PROCEDURES FOR THE DK100/DK120 AND THE N30A26 SERIES
MOUNTING KIT. ........................................................................................................................................ 9
2.7. INSTALLATION PROCEDURES FOR THE DK100/DK120 AND THE N30A21A MOUNT‑
ING KIT. .................................................................................................................................................................. 10
2.8. INSTALLATION PROCEDURES FOR THE DK130/DK140 AND THE N30A29 SERIES
MOUNTING KIT. ...................................................................................................................................... 12
2.9. INSTALLATION PROCEDURES FOR THE DK130/DK140 AND THE N30A21A
MOUNTING KIT. ...................................................................................................................................... 13
SECTION III ................................................................................................................................. 15
OPERATION ................................................................................................................................ 15
3.1. THEORY OF OPERATION. ................................................................................................................................................. 15
SECTION IV ................................................................................................................................. 16
TESTING .............................................................................................................................. 16
4.1. GENERAL. ........................................................................................................................................... 16
4.2. BATTERY TESTING.. ........................................................................................................................................ 16
4.3. OPERATIONAL TESTING. ......................................................................................................................................... 16
SECTION V .................................................................................................................................. 17
MAINTENANCE DK100/DK130 .................................................................................................................. 17
5.1. GENERAL. ........................................................................................................................................... 17
5.2. BEACON CLEANING. ............................................................................................................................ 17
5.3. BEACON TESTING. ................................................................................................................................ 17
5.4. PRECAUTIONS. ................................................................................................................................. 17
5.5. BATTERY. ............................................................................................................................................................. 17
5.6. BEACON DISPOSAL. ........................................................................................................................ 17
5.7. BEACON STORAGE. ........................................................................................................................ 17
SECTION VI ................................................................................................................................. 18
MAINTENANCE DK120/DK140 .................................................................................................................. 18
6.1. GENERAL. ........................................................................................................................................... 18
6.2. BEACON CLEANING. ............................................................................................................................ 18
6.3. BEACON TESTING. ................................................................................................................................ 18
6.4. PRECAUTIONS . ............................................................................................................................................................ 18
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03-TM-0037 REV B Page 4 of 24
6.5. BEACON DISASSEMBLY. .................................................................................................................... 18
6.6. BATTERY REPLACEMENT AND TESTING. ..................................................................................................... 18
6.7. BEACON OFF-CURRENT TEST. ......................................................................................................................... 21
6.8. BATTERY DISPOSAL. ...................................................................................................................................... 21
6.9. BEACON STORAGE. ........................................................................................................................ 21
SECTION VII ............................................................................................................................... 22
WARRANTY DK100/DK120/DK130/DK140 ............................................................................................ 22
SECTION VIII ................................................................................................................................... 23
SERVICE PROGRAM DK100/DK120/DK130/DK140 ........................................................................ 23
8.1. BEACON RETURN - DEFECTIVE. ............................................................................................................... 23
8.2. BEACON RETURN - NO DEFECT. ............................................................................................................... 23
8.3. BEACON RETURN - OUT OF WARRANTY. .................................................................................................. 23
8.4. BATTERY CHANGE/OVERHAUL FOR THE DK100/DK120/DK130/DK140. ............................... 23
SECTION IX ................................................................................................................................. 24
PROCEDURE FOR RETURNING DK100/DK120/DK130/DK140 ................................................... 24
BEACON TO FACTORY ................................................................................................................. 24
9.1. BEACON SERVICE. ................................................................................................................................ 24
9.2. BATTERY CHANGE/OVERHAUL. ......................................................................................................................... 24
TABLE OF FIGURES
Figure 1. DK Series Underwater Acoustic Beacon Installed in Mounting Kits ....................................... 5
Figure 2. Water Switch Location on Beacon ............................................................................................. 5
Figure 3. N30A26 Series Mounting Kit Installation Details (N30A26B shown) .................................. 9
Figure 4. Installation of N30A26 Series Mounting Kit and Beacon ....................................................... 10
Figure 5. Mounting Hole Template for N30A21A Mounting Kit ............................................................. 10
Figure 6. N30A21A Mounting Kit and Beacon Overall Dimensions .................................................. 11
Figure 7. Method of Installing the N30A21A Mounting Kit ............................................................... 11
Figure 8. Securing Beacon in N30A21A Mounting Kit ..................................................................... 11
Figure 9. N30A29 Mounting Kit Installation Details ........................................................................... 12
Figure 10. Installation of N30A29 Series Mounting Kit and Beacon ..................................................... 13
Figure 11. Mounting Hole Template for N30A21A Mounting Kit ........................................................... 13
Figure 12. N30A21A Mounting Kit and Beacon Overall Dimensions ................................................... 14
Figure 13. Method of Installing the N30A21A Mounting Kit ................................................................... 14
Figure 14. Securing Beacon In N30A21A Mounting Kit ........................................................................ 14
Figure 15. Nominal Pulse Train ........................................................................................................ 15
Figure 16. Typical Beacon Label ................................................................................................................. 16
Figure 17. Beacon Voltage Code .............................................................................................................. 16
Figure 18. Battery End Cover Removal With Vise Clamp and Spanner Wrench .................................. 19
Figure 19. Battery Kit Part Number ......................................................................................................... 19
Figure 20. Beacon Exploded View Showing Relative Location of Battery and Related
Parts ........................................................................................................................................................ 20
Figure 21. RBB Label Placement ............................................................................................................ 21
Figure 22. Beacon Off-Current Test Set-Up ................................................................................................................... 21
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03-TM-0037 REV B 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”, manu-
factured by Dukane Seacom, Inc., 7135 16th Street East,
Suite 101, Sarasota, FL 34243. These beacons 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
CAUTION
THIS MANUAL PROVIDES THE NEC-
ESSARY INFORMATION TO PERFORM
THE REPAIR IN AN INTERMEDIATE
LEVEL MAINTENANCE SHOP (I-
LEVEL).
THE 3RD LEVEL OF MAINTENANCE
SHOP (D-LEVEL) IS NOT APPLICABLE
IN THIS MANUAL.
Figure 2. Water Switch Location
on Beacon
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 Se-
ries beacons operate for 30 days when immersed in
water. See Figure 2.
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 con-
junction 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 uti-
lizing a portable receiver equipped with a directional
hydrophone such as the Dukane Model DSL-375 Loca-
tor System (N30A5B no longer available for purchase).
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.
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03-TM-0037 REV B Page 6 of 24
DK100/DK120 BEACON SPECIFICATIONS
Operating Frequency...................................................
Operating Depth..........................................................
Pulse Length................................................................
Pulse Repetition Rate..................................................
Operating Life..............................................................
Battery Life In Beacon..................................................
Acoustic Output, Initial................................................
Acoustic Output After 30 Days....................................
Operating Temperature Range......................................
Actuation......................................................................
Radiation Pattern..........................................................
Size...............................................................................
Weight, Beacon.............................................................
Weight, N30A26B Mount............................................
Weight, N30A21A Mount............................................
Storage Temperature Range..........................................
37.5 kHz ± 1 kHz
Surface to 20,000 feet (6096 meters)
9.0 milliseconds Minimum
Not less than 0.9 Pulse/Sec
30 days (minimum)
6 Years
1060 dynes/cm2 rms pressure at 1 meter (160.5dB)
700 dynes/cm2 rms pressure at 1 meter (157.0dB)
+28°F (-2.2°C) to +100°F (+37.8°C)
Fresh or salt water
Rated output over 80 percent of sphere
1.30 inches (3.30 cm) diameter x 3.92 inches
(9.95 cm) long (less mount)
6.7 ounces (190 grams)
6 ounces (170 grams)
3 ounces (85 grams)
-67°F (-55°C) to +160°F (+71°C)
1.2.4. 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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03-TM-0037 REV B Page 7 of 24
DK130/DK140 BEACON SPECIFICATIONS
Operating Frequency .................................
Operating Depth ...........................................
Pulse Length ..............................................
Pulse Repetition Rate ...................................
Operating Life ..................................................
Battery Life In Beacon ..................................
Acoustic Output, Initial ..................................
Acoustic Output After 30 Days .....................
Operating Temperature Range ....................
Actuation ....................................................
Radiation Pattern ..........................................
Size .............................................................
Weight, Beacon .............................................
Weight, N30A29 Mount ..............................
Weight, N30A21A Mount ............................ ...
Storage Temperature Range .........................
37.5 kHz ± 1 kHz
Surface to 20,000 feet (6096 meters)
9.0 milliseconds Minimum
Not less than 0.9 Pulse/Sec
30 days (minimum)
6 Years
1060 dynes/cm
2
rms pressure at 1 meter
(160.5dB)
700 dynes/cm
2
rms pressure at 1 meter (157.0dB)
+28°F (-2.2°C) to +100°F (+37.8°C)
Fresh or salt water
Rated output over 80 percent of sphere
1.30 inches (3.30 cm) diameter x 2.97 inches
(7.54 cm) long (less mount)
4.9 ounces (139 grams)
3.5 ounces (99 grams)
3 ounces (85 grams)
-67°F (-55°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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03-TM-0037 REV B Page 8 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 BEA-
CON.
NOTE
All installations to Cockpit Voice Recorders and
Flight Data Recorders should be in accordance
with the recorder manufacturer’s approved proce-
dures and hardware.
2.3. SURVIVABILITY.
2.3.1. The beacon location should minimize the proba-
bility 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 con-
sideration 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.
2.3.3. Installation should be made to a substantial
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).
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 ex-
ceed 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, cloth-
ing, parachutes, cargo, etc., are sound absorbing ma-
terials. Do not surround the device with these materi-
als and if necessary, remove small areas of such ma-
terials 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 neces-
sary for actuation and acoustic radiation.
2.5. MAINTENANCE.
In addition to observance of the preceding manda-
tory considerations, where possible the selection of
a mounting location should provide for convenient
beacon access during inspection intervals. The prop-
er mounting location should also provide for clear-
ance for removing the beacon from its mounting hard-
ware.
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03-TM-0037 REV B Page 9 of 24
2.6. INSTALLATION PROCEDURES FOR
THE DK100/DK120 AND THE N30A26 SE-
RIES MOUNTING KIT.
2.6.1. GENERAL. Model N30A26 Series Mounting
Kit (Cradle Type) is an aluminum extrusion with a
screw attached securing plate that provides rugged
mounting and protection of the beacon within the aircraft.
See Figure 3. The beacon should be mounted horizontal-
ly with the switch end forward, if possible. If vertical
mounting is necessary, switch end must be mounted
downward to prevent accumulation of dirt, grease and
water on the switch end.
2.6.2. CRADLE MOUNTING PROCEDURE.
A. Using Figure 3 as a guide, locate the four 0.290
inch (0.737 cm) diameter holes on 1.500 by 2.400 inch
(3.810 by 6.096 cm) centers. Be sure access to the se-
curing plate end is available for future beacon installa-
tion and removal. Approximately 4.5 inches (11.43 cm)
clearance should be allowed for beacon removal.
NOTE
The mounting bracket can be used as a template
to mark for drilling the holes prior to the instal-
lation of beacon. Always remove beacon from
mount prior to marking or drilling.
CAUTION
WHEN MOUNTING TO THE AIR-
FRAME, CHECK THE OPPOSITE SIDE
OF THE FRAME OR BULKHEAD FOR
DRILLING CLEARANCE.
WARNING
USE PROTECTIVE EYE EQUIPMENT
DURING DRILLING OPERATION.
B. After the four 0.290 inch (0.737 cm) diameter
holes have been located, drill the holes with an “L”
twist drill.
C. Secure the mounting cradle to the aircraft structure
with four 1/4-20 stainless steel screws and associat-
ed washers and nuts (not furnished), as shown in
Figure 3. Alternate mounting with threaded holes may
be employed where structure does not permit nuts on
rear side.
CAUTION
DO NOT ADD ANY UNAPPROVED
STAMP, ETCHING, OR LABEL TO
THE BEACON CASE OR END CAPS.
2.6.3. INSTALLING DK100/DK120 BEACON IN-
TO N30A26 SERIES MOUNTING KIT.
A. If the securing plate and its attaching hardware
are already attached to the main body of the mounting
cradle, remove them.
B. Make sure that the beacon case and water
switch are free of grease or film. If in doubt, wipe
clean with mild detergent.
Figure 3. N30A26 Series Mounting
Kit Installation Details
(
N30A26B shown)
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03-TM-0037 REV B Page 10 of 24
C. Test the beacon as outlined in Section IV to en-
sure operation prior to installation.
D. Insert the beacon into the mounting cradle with the
water switch facing forward and/or downward with ref-
erence to the aircraft. Rotate the beacon in the mount
so that the beacon replacement date can be read. See
Figure 4.
E. Screw securing plate in place with the set of fur-
nished screws and washers. Tighten until the securing
plate makes contact with the frame in the area of the
screws, with approximately 15 to 20 inch-pounds
torque.
F. Perform the Operational Test outlined in Section
IV.
2.7. INSTALLATION PROCEDURES FOR THE
DK100/DK120 AND THE N30A21A MOUNT-
ING KIT.
2.7.1. GENERAL. Space limitations sometimes re-
quire the use of the strap-type N30A21A Mounting
Kit. Where a choice exists, horizontal mounting with
switch forward is best. If vertical mounting is em-
ployed, mount switch down to reduce accumulation
of grease, dirt, and water on the switch end of the bea-
con.
2.7.2. MOUNTING PROCEDURE
A. Lay out four holes as shown in Figure 5. Posi-
tion mounting kit carefully to avoid interference with
other structures. Observe the clearances required as
shown in Figures 5 and 6, and in established tool
and maintenance clearances.
B. Drill the four 0.272 inch (0.691 cm) (“I” drill) holes
in the mounting surface as shown in Figure 5.
Figure 5. Mounting Hole Template
for N30A21A Mounting Kit
C. Test the beacon as outlined in Section IV to en-
sure operation prior to installation.
D. Slip the retainer straps of the mounting kit over
the ends of the beacon. See Figures 7 and 8.
E. Insert the ends of the retainer straps through the
0.272 inch (0.691 cm) holes in the mounting surface.
When horizontal mounting is used, position beacon
with switch end forward.
Figure 4. Installation of N30A26
Series Mounting Kit and Beacon
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03-TM-0037 REV B Page 11 of 24
If vertical mounting is employed, the switch end
should be facing downwards to reduce the accu-
mulation of dirt, grease, and water on the switch
end. Rotate the beacon in the mount, so that the
markings and beacon replacement date label can be
read.
Figure 6. N30A21A Mounting Kit
and Beacon Overall Dimensions
F. Install a flat washer and nut on each end of the re-
tainer straps.
Figure 7. Method of Installing the
N30A21A Mounting Kit
Figure 8. Securing Beacon in
N30A21A Mounting Kit
2.7.3. INSTALLING BEACON INTO
N30A21A MOUNTING KIT.
A. Test the beacon as outlined in Section IV to en-
sure operation prior to installation.
B. Torque the four nuts to 25 to 30 inch-pounds. Be
sure that all four studs protrude approximately the
same amount to ensure that the strap seats properly
around the beacon.
C. Make sure that the beacon case and water
switch are free of grease film. If in doubt, wipe clean
with mild detergent.
CAUTION
ADDITIONAL UNAPPROVED STAMP OR LA-
BEL ON BEACON CASE WILL REDUCE
ACOUSTIC RADIATION.
D. Perform the Operational Test outlined in Section
IV.
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03-TM-0037 REV B Page 12 of 24
2.8. INSTALLATION PROCEDURES FOR
THE DK130/DK140 AND THE N30A29 SE-
RIES MOUNTING KIT.
2.8.1. GENERAL. Model N30A29 Series Mount-
ing Kit (Cradle Type) is an aluminum extrusion
with a screw attached securing plate that provides
rugged mounting and protection of the beacon within
the aircraft. See Figure 9. The beacon should be
mounted horizontally with the switch end forward, if
possible. If vertical mounting is necessary, switch
end must be mounted downward to prevent accumu-
lation of dirt, grease and water on the switch end.
2.8.2. CRADLE MOUNTING PROCEDURE.
A. Using Figure 9 as a guide, locate the four 0.290
inch (0.737 cm) diameter holes on 1.500 in by 1.500
in (3.810 by 3.810 cm) centers. Be sure access to the
securing plate end is available for future beacon in-
stallation and removal. Approximately 4.5 inches
(11.43 cm) clearance should be allowed for beacon
removal.
Figure 9. N30A29 Mounting Kit
Installation Details
NOTE
The mounting bracket can be used as a tem-
plate to mark for drilling the holes prior to
the installation of the beacon.
Always remove the beacon from the mount prior
to marking or drilling.
CAUTION
WHEN MOUNTING TO THE AIR‑
FRAME, CHECK THE OPPOSITE
SIDE OF THE FRAME OR BULK‑
HEAD FOR DRILLING CLEARANCE.
WARNING
USE PROTECTIVE EYE EQUIP-MENT
DURING DRILLING OPERA-TION.
B. After the four 0.290 inch (0.737 cm) diameter holes
have been located, drill the holes with an “L” twist
drill.
C. Secure the mounting cradle to the aircraft
structure with four 1/4-20 stainless steel screws and
associated washers and nuts (not furnished), as
shown in Figure 9. Alternate mounting with threaded
holes may be employed where structure does not per-
mit nuts on rear side.
CAUTION
DO NOT ADD ANY UNAPPROVED
STAMP, ETCHING, OR LABEL TO THE
BEACON CASE OR END CAPS.
2.8.3. INSTALLING DK130/DK140 BEACON IN-
TO N30A29 SERIES MOUNTING KIT.
A. If the securing plate and its attaching hardware
are already attached to the main body of the mounting
cradle, remove them.
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03-TM-0037 REV B Page 13 of 24
B. Make sure that the beacon case and water
switch, are free of grease or film. If in doubt, wipe
clean with mild detergent
C. Test the beacon as outlined in Section IV to en-
sure operation prior to installation.
2.9.2. MOUNTING PROCEDURE.
A. Lay out four holes as shown in Figure 11. Position
mounting kit carefully to avoid interference with other struc-
tures. Observe the clearances required as shown in Figures
11 and 12, and in established tool and maintenance clear-
ances.
B. Drill the four 0.272 inch (0.691 cm) (“I” drill) holes
in the mounting surface as shown in Figure 11.
Figure 11. Mounting Hole Tem
plate for N30A21A Mounting Kit
C. Test the beacon as outlined in Section IV to en-
sure operation prior to installation.
D. Slip the retainer straps of the mounting kit over
the ends of the beacon. See Figures 13 and 14.
Figure 10. Installation of N30A29
Series Mounting Kit and Beacon
D. Insert the beacon into the mounting cradle with
the water switch facing forward and/or downward
with reference to the aircraft. Rotate the beacon in
the mount so that the beacon replacement date can
be read. See Figure 10.
E. Screw securing plate in place with the set of fur-
nished screws and washers. Tighten until the secur-
ing plate makes contact with the frame in the area
of the screws, with approximately 15 to 20 inch-
pounds torque.
F. Perform the Operational Test outlined in Sec-
tion IV.
2.9. INSTALLATION PROCEDURES FOR
THE DK130/DK140 AND THE N30A21A
MOUNTING KIT.
2.9.1. GENERAL. Space limitations sometimes re-
quire the use of the strap type N30A21A Mounting Kit.
Where a choice exists, horizontal mounting with
switch forward is best. If vertical mounting is em-
ployed, mount switch down to reduce accumulation
of grease, dirt, and water on the switch end of the
beacon.
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03-TM-0037 REV B Page 14 of 24
E. Insert the ends of the retainer straps through the 0.272
inch (0.691 cm) holes in the mounting surface. When hori-
zontal mounting is used, position beacon with switch end
forward. If vertical mounting is employed, the switch end
should be facing downwards to reduce the accumulation
of grease and dirt on the switch end. Rotate the beacon
in the mount, so that the markings and beacon replace-
ment date label can be read.
F. Install a flat washer and nut on each end of the re-
tainer straps.
Figure 14. Securing Beacon In
N30A21A Mounting Kit
2.9.3. INSTALLING BEACON INTO N30A21A
MOUNTING KIT.
A. Test the beacon as outlined in Section IV to
ensure operation prior to installation.
B. Torque the four nuts to 25 to 30 inch-pounds.
Be sure that all four studs protrude approxi-
mately the same amount to ensure that the strap
seats properly around the beacon.
C. Make sure that the beacon case and water
switch are free of grease film. If in doubt, wipe
clean with mild detergent.
CAUTION
ADDITIONAL UNAPPROVED
STAMPS OR LABELS ON THE BEA‑
CON CASE WILL REDUCE ACOUS‑
TIC RADIATION.
D. Perform the Operational Test outlined in
Section IV.
Figure 12. N30A21A Mounting Kit
and Beacon Overall Dimensions
Figure 13. Method of Installing
The N30A21A Mounting Kit
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03-TM-0037 REV B Page 15 of 24
SECTION III
OPERATION
3.1. THEORY OF OPERATION.
3.1.1. The DK Series beacon is a battery operated
underwater acoustic pulse generator that is activated
when the water switch is immersed in either fresh or
salt water.
3.1.2. The water switch is part of a triggering circuit,
which when actuated will initiate normal pulsing of
the beacon circuit. The signal is coupled to a piezo-
ceramic transducer ring. This results in mechanical
motion that is transmitted to the metal case of the
beacon, which in turn, radiates acoustic energy into
the surrounding water at 37.5 kHz.
3.1.3. The pulses generated are approximately 10 milli-
seconds in duration, and occur about once per sec-
ond in water. See Figure 15.
Figure 15. Nominal Pulse Train
The beacon will operate for a minimum of 30 days
after being immersed in the water. The beacon will
withstand depths to 20,000 feet (6096 meters). It can
be detected at a range of 2000 to 4000 yards (1800 to
3600 meters). The sea state, nearby boats, marine
animals, gas or oil lines, and other factors contrib-
uting to the ambient noise level will affect the range
at which the beacon can be detected.
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03-TM-0037 REV B Page 16 of 24
SECTION IV
TESTING
4.1. GENERAL.
The DK Series beacon should be tested before and
after installation in the mounting kit and at recom-
mended maintenance intervals. See Sections V and
VI.
4.2. BATTERY TESTING.
Use a high impedance voltmeter (input impedance
of 10 M ohms) (not required when using the TS200
Test Set) to perform the following
procedure:
A. Make sure the case and water switch are clean and
dry prior to testing. If in doubt, wipe clean using mild
detergent and a soft cloth.
B. Place the negative lead of the high impedance volt-
meter on the water switch pin and the positive lead
of the meter on the beacon case or the mounting kit,
if already installed.
C. Measure the battery voltage. Note: Inspect label
on beacon to determine battery code. See Figure 16
and refer to Figure 17 for voltage specifications.
The beacon is operable at the given minimum ac-
ceptable voltage. For DK Series beacons if the bat-
tery voltage is below the minimum acceptable volt-
age remove the beacon from service and contact
Dukane Seacom, Inc. for instructions.
Figure 16. Typical Beacon Label
Figure 17. Beacon Voltage Code
4.3. OPERATIONAL TESTING.
The 42A12E and 42A12/1 Ultrasonic Test Set, or
TS200 Portable Test Set shall be used to perform oper-
ational tests on the beacon.
NOTE
CODE
MINIMUM AC CEPTABLE
VOLTAGE
B 2. 97 VOLTS
C 2. 97 VOLTS
D 2. 97 VOLTS
The procedure for use of the 42A12 Ultrasonic
Test Set Series and the TS200 Portable Test Set
are contained in their respective Test manuals.
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03-TM-0037 REV B Page 17 of 24
SECTION V
MAINTENANCE DK100/DK130
5.1. GENERAL.
This section contains DK100/DK130 Beacon cleaning,
beacon testing, battery testing, disposal and storage
procedures. Initially beacons must be tested at every in-
stallation or beacon change. The required schedule for
battery replacement, available only at Dukane Seacom,
Inc. is every six years. When the beacon is installed on
the aircraft, the recommended schedule for beacon
cleaning and testing is every 24 months, when the bea-
con is installed on a recorder and the recorder is in-
stalled in accordance with its TSO. For non-recorder
aircraft installations the recommended schedule is eve-
ry six months.
5.2. BEACON CLEANING.
Clean the switch end of the beacon with a soft cloth and
mild detergent, then dry thoroughly with a clean cloth.
Clean the switch end insulator to prevent leakage cur-
rents from occurring across the switch. This will affect
battery life. The water switch should be cleaned when dirt
or dust becomes apparent.
5.3. BEACON TESTING.
5.3.1. Make sure that the beacon case is clean and
dry prior to testing.
5.3.2. See Sections 4.2. and 4.3. for testing pro-
cedures.
5.4. PRECAUTIONS.
5.4.1. The DK100/DK130 Beacons must not be ex-
posed to heat in excess of 160°F (71°C).
5.4.3. Any situation that could possibly crush or pene-
trate the case of the beacon should be avoided.
5.5. BATTERY.
WARNING
REMOVAL OF BATTERY FROM BEA-
CON WILL VOID THE WARRANTY.
The beacon requires NO battery maintenance. DO
NOT
remove the battery at any time. The beacon
must be taken out of service according to the expira-
tion date printed on the beacon case and returned
to the factory for service. See Section IX for beacon
Return Procedures.
WARNING
FAILURE TO OBSERVE THE ABOVE
PRECAUTIONS COULD RESULT IN
THE RELEASE OF HAZARDOUS
CHEMICALS.
5.6. BEACON DISPOSAL.
Should it be necessary to dispose of the beacon for
any reason, DO NOT THROW IT AWAY. This
beacon contains a lithium battery and may be con-
sidered hazardous waste. Regulations are not con-
sistent from one territory to another, please contact
your State Authority for current information.
5.7. BEACON STORAGE.
When long term storage of the beacon is required, the
beacon should be stored in the original shipping container
(or equivalent). Make sure it is stored in a cool dry envi-
ronment.
5.4.2. The beacon must not be disassembled in any way.
Any disassembly of the beacon will void the warranty
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03-TM-0037 REV B Page 18 of 24
SECTION VI
MAINTENANCE DK120/DK140
6.1. GENERAL.
This section contains DK120/DK140 Beacon clean-
ing, beacon testing, battery replacement and testing,
disposal and storage procedures. Initially beacons
must be tested at every installation or battery change.
The required schedule for Battery Replacement and
Off-Current Testing is every six years.
When the beacon is installed on the aircraft, the rec-
ommended schedule for beacon cleaning and testing
is every 24 months, when the beacon is installed on
a recorder and the recorder is installed in accord-
ance with its TSO. For non-recorder aircraft instal-
lations the recommended schedule is every six
months.
6.2. BEACON CLEANING.
Clean the switch end of the beacon with a soft cloth
and mild detergent, then dry thoroughly with a
clean cloth. Clean the switch end insulator to prevent
leakage currents from occurring across the switch.
This will affect battery life. The water switch should
be cleaned when dirt or dust becomes apparent.
6.6. BATTERY REPLACEMENT AND TESTING.
WARNING
INCORRECT INSTALLATION OF
BATTERY WILL CAUSE PERMA-
NENT DAMAGE TO BEACON.
6.6.1. GENERAL. Battery replacement should be
done in a maintenance shop under clean conditions
to prevent dust from contaminating O-ring and
lubricant. Because the old O-ring may have devel-
oped a set with age, O-ring replacement is manda-
tory at the time of battery change. O-ring lubrication
should be applied to new O-ring and threads before
installation.
NOTE
Replacement of the battery in the DK120 or DK140
beacon must be done by a qualified technician.
CAUTION
TO AVOID INTERNAL DAMAGE, DO NOT
CLAMP THE BEACON IN A VISE, UNLESS
A VISE CLAMP (P/N 810-546) IS USED
6.3. BEACON TESTING.
6.3.1. Make sure that the beacon case is clean and dry
prior to testing.
6.3.2. See Sections 4.2. and 4.3. for testing proce-
dures.
6.4. PRECAUTIONS.
6.4.1. The DK120/DK140 Beacon must not be exposed
to temperatures in excess of 160°F (71°C).
6.4.2. Any situation that could possibly crush or pene-
trate the case of the beacon should be avoided.
6.5. BEACON DISASSEMBLY.
Disassembly of the beacon is limited to battery re-
placement, as outlined in Section 6.6.
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03-TM-0037 REV B Page 19 of 24
CAUTION
FOREIGN SUBSTANCES IN LUBRI-
CANT ON SEALING SURFACES MAY
DAMAGE THREADS AND/OR AL-
LOW WATER LEAKAGE THROUGH
THE O-RING SEAL. SCRATCHES OR
GOUGES ON SEALING SURFACES
WILL ALSO CAUSE WATER LEAK-
AGE.
H. Carefully install a new O-ring on the battery cov-
er. Apply a thin coating of O-ring lubricant to O-ring,
O-ring groove and threads. NOTE: O-ring, lubricant and
battery are provided in battery replacement kit. See Fig-
ure 19 for battery kit number. Contact Dukane Seacom,
Inc., at [phone], for replacement battery kits.
I. Install new battery. Be sure the end marked
“INSERT THIS END FIRST “ goes in first.
( See Figure 20. )
Figure 18. Battery End Cover
Removal With Vise Clamp and
Spanner Wrench
6.6.2. BATTERY REPLACEMENT.
A. Both the Vise Clamp (P/N 810-546) and the
Spanner Wrench (P/N 810-325) are available in kit
P/N 810-2007/KVS.
B. Secure the beacon with Vise Clamp
(P/N 810-546) as shown in Figure 18.
C. Use Spanner Wrench (P/N 810-325) to remove
the battery end cover with 2 wrench holes by un-
screwing counterclockwise. The breakaway torque is
usually high so spanner wrench should be held firm-
ly in contact with battery end cover in order to pre-
vent damage to wrench holes.
D. Remove shock cushion from battery end of bea-
con if not removed with cover.
E. Remove the old O-ring from the cover. Do not use a
steel screwdriver or sharp tool because of danger of
damaging O-ring groove.
F. Remove the old battery. NOTE: Ensure that the
battery pad remains in beacon.
G. Clean the threads, O-ring groove in the body and the
threads on the cover by wiping them thoroughly with sol-
vent.
Figure 19. Battery Kit Part Number
CODE REQUIRED BATTERY KIT
B 81 0- 2007/K
C 81 0- 200 8/K
D 81 0- 2007/K
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03-TM-0037 REV B Page 20 of 24
Figure 20. Beacon Magnified View Showing Relative Location
of Battery and Related Parts
WARNING
REPLACE BATTERY WITH AUTHORIZED
REPLACEMENT PARTS ONLY. USE OF
AN UNAUTHORIZED BATTERY WILL
VOID THE WARRANTY AND MAY CAUSE
AN INOPERATIVE OR DANGEROUS
CONDITION. USE OF AN UNAU-
THORIZED BATTERY MAY PRESENT A
RISK OF FIRE OR EXPLOSION. SEE FIG-
URE 19 PAGE 18 FOR REPLACEMENT
BATTERY KIT.
CAUTION
DO NOT RECHARGE, DISASSEMBLE,
HEAT ABOVE 160°F (71°C) OR INCINER-
ATE. DISPOSE OF THE BATTERIES
PROMPTLY (IN ACCORDANCE WITH
ALL LOCAL STATE AND FEDERAL RE-
QUIREMENTS), KEEP AWAY FROM CHIL-
DREN. THERE IS A RISK OF BATTERY
FIRE, EXPLOSION, AND BURNS.
J. Perform OFF-CURRENT TEST as outlined in Sec-
tion 6.7.
K. Position rubber shock cushion around contact
spring and on the inside of the battery cover.
L. Replace the cover and tighten it until the cover
flange contacts the body or leaves less than a 0.003
inch gap. Use hand force only on the wrench. Hold
the beacon in a vise clamp as shown in Figure 18.
Clean the beacon exterior of excess O-ring grease.
M. Perform operational test of beacon as outlined
in Section IV.
N. Replace the battery replacement date label on the
outside of the beacon case with the new label supplied
with the battery. Locate the label on the beacon body
in the space provided as shown in Figure 21. Never
put label on the water switch end of the beacon.
Place the new label on the beacon after the beacon is
installed in the mount.
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