COMPONENT MAINTENANCE MANUAL
AVIATION RECORDERS
FA2100CVR
Rev. 15 Page 173
Apr. 14/16
Testing & Fault Isolation
23–70–04
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to the restrictions on the cover page of this document.
Table 104. Underwater Locator Beacon Test Using Test Set P/N: 42A12( )
and 10 Mohm High Impedance Voltmeter
PROCEDURE
This test should be performed after the 90
−
Day Beacon is installed. It verifies the proper
operation of the Underwater Locator Beacon after mounting on the CSMU.
1) To test the Beacon battery voltage, place the negative lead of the high impedance
voltmeter on the metal pad at the center of the water switch and the positive lead on the
Beacon case.
2) Measure the battery voltage. 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.
3) To perform an operational test of the Beacon, turn on the test set by rotating the front
panel GAIN control clockwise until it clicks.
4) On the front panel of the test set, set the INT.-EXT. switch to INT.
5) Rotate TUNING control to a setting between 35 and 40 kHz.
6) Use a metal braid, or other flexible metal conductor, to temporarily short the metal pad at
the center of the water switch to the Beacon case, and activate the unit.
7) Make sure that the test set’s microphone and the Beacon are in close proximity of each
other with unobstructed, line
−
of
−
sight between them. This will ensure that the test set will
detect the proper output of the Beacon.
8) If the Underwater Locator Beacon is functioning properly, it will emit inaudible, ultrasonic
sound waves that the test set will receive and reproduce as repetitive beeps through the
test set’s speakers.
9) Remove the metal conductor to stop the short and turn off the test set.
10) If required, record the Beacon’s serial number and expiration date on the appropriate
recorder data record.
The document reference is online, please check the correspondence between the online documentation and the printed version.