COMPONENT MAINTENANCE MANUAL
AVIATION RECORDERS
Model FA5000
Rev. 04 Page 129
Feb. 27/14
Testing & Fault Isolation
23–70
−
40
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the restrictions on the cover page of this document.
6.
TEST THE UNDERWATER LOCATOR BEACON (ULB)
The 17TES0015 is a battery operated heterodyne type receiver that operates at an ul-
trasonic frequency of 37.5 kHz. The test set is a self-contained, hand held functional
tester for testing 90
−
Day and 30
−
Day Underwater Locator Beacons. Use the internal
microphone and loudspeaker to perform an operational test on a beacon without re-
moving it from the recorder’s CSMU Mount. The test set can also be used to perform a
voltage measurement for testing the replacement battery within a Beacon.
Table 102. Underwater Locator Beacon Test Using L
−
3AR Test Set P/N:
17TES0015
PROCEDURE
This test should be performed after the Beacon is installed. It verifies the proper
operation of the Beacon after mounting on the CSMU.
1) Turn the test set ON using the small slide switch located on the left side of the housing.
2) If the display reads LB, the test set battery voltage has fallen below the level required for
operation, and the 9
−
Volt battery should be replaced.
3) To test the Beacon battery voltage, attach the test probe clip to the Beacon case. The clip
has a spring action that will allow it to slip over the housing on the Beacon. Ensure that
the exposed metal on the Beacon is resting in the metal cradle to make the best
connection.
4) Place the tip of the probe in contact with the metal pad at the center of the water switch.
5) Read the battery voltage from the test set display. If the battery voltage is at or above
2.97 volts, the battery is operable. If the battery voltage is below 2.97 volts, remove the
Beacon from service.
6) To perform an operational test of the Beacon, place the probes on the Beacon as
described above and press the red button on the test set (the display will be blank during
this operation).
7) If the Beacon is operating properly, a pinging sound will be audible from the test set
speakers. If hearing is difficult due to background noise, repeat the test in a quieter area.
8) Turn off the test set, and remove the Beacon from the test probe clip.
9) If required, record the Beacon’s serial number and expiration date on the appropriate
recorder data record.
Rev. 06 Page 129
Mar. 16/16
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