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03-TM-0037 REV 13
Page 18 of 24
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.
SECTION VI
MAINTENANCE DK120/DK140
6.1. GENERAL.
This section contains DK120/DK140 Beacon
cleaning, 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 Bat-
tery Replacement and Off-Current Testing 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 beacon 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 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.
6.3. 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
procedures.
6.4. PRECAUTIONS.
6.4.1. The DK120/DK140 Beacon must not be
exposed to temperatures in excess of 160°F
(71°C).
6.5. BEACON DISASSEMBLY.
Disassembly of the beacon is limited to battery
replacement, as outlined in Section 6.6.
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 developed a set with age, O-ring
replacement is mandatory at the time of battery
change. O-ring lubrication should be applied to
new O-ring and threads before installation.
6.4.2. Any situation that could possibly crush or
penetrate the case of the beacon should be
avoided.