L3 FA2100 CVR Component Maintenance Manual With Illustrated Parts List page 221

Table 103. Underwater Locator Beacon Test Using L−3AR Test Set P/N:
This test should be performed after the 90−Day 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. Place the tip
of the probe in contact with the metal pad at the center of the water switch.
4) 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.
5) 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).
6) 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.
7) Turn off the test set, and remove the Beacon from the test probe clip.
8) If required, record the Beacon's serial number and expiration date on the appropriate
recorder data record.
Alternate Method to Test the 90-Day Underwater Locator Beacon
Note that using this method requires the use of a 10 Mohm impedance voltmeter that is
not included in the test set.
Use or disclosure of information on this sheet is subject
to the restrictions on the cover page of this document.
The document reference is online, please check the correspondence between the online documentation and the printed version.
AVIATION RECORDERS
COMPONENT MAINTENANCE MANUAL
FA2100CVR
17TES0015
PROCEDURE
23–70–04
Testing & Fault Isolation
Rev. 15 Page 172
Apr. 14/16