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SOUTHWEST AIRLINES PROPRIETARY(c) All rights reserved

VOICE RECORDER SYSTEM
SELF-TEST

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737-700 MAINTENANCE TRAINING MANUAL

VOICE RECORDER SYSTEM -TRAINING INFORMATION POINT - MAINTENANCE
A23-71-00-010.fm
General
The cockpit voice recorder system has an internal BITE circuit that lets you monitor and do a test of system operation. A TEST switch on the control panel lets you manually start the system
test. BITE Operation The recorder does an automatic test at power up. It also does
continuous monitoring while in normal operation. When a failure happens, the BITE stores the failure in memory and turns on the BITE indicator.
You use BITE to do a test of all the recorder circuitry. When you push the control panel TEST switch, BITE makes a test tone. The recorder stores this test tone on each channel. BITE then monitors the stored tone to make sure it has the correct frequency and amplitude.
System Test
When the voice recorder has power, you can start the test.
You hear a tone on the headphone jack and the green status indicator

comes on for a short time.
The voice recorder BITE indicator stays off.
These are the results if the test fails:

-Green status indicator stays off
-Voice recorder BITE indicator comes on
-No tone on the headphone jack.

Operational Test
The system test does not do a check of the audio circuits to the voice recorder. To do a test of these circuits, you must make a test recording.
Do these steps to do a test of the captain, first officer, and first observer input channels:
-Disconnect all microphones and cover the area microphone -Connect a headset to the control panel HEADPHONE jack -Connect a microphone into a station that you want to monitor -Speak into microphone and monitor the recorded audio from the
HEADPHONE jack.

Do these steps to do a test of the area microphone input:
-Disconnect the microphones for the captain, first officer, and first
observer input channels -Connect a headset to the control panel HEADPHONE jack -Speak into the area microphone and monitor the recorded audio
from the HEADPHONE jack.
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SOUTHWEST AIRLINES.
737-700 MAINTENANCE TRAINING MANUAL

A23-71-00-010.fm
COCKPIT VOICE RECORDER MICROPHONE MONITOR 
STATUS INDICATOR  ERASE  TEST 
STATUS  HEADPHONE 
HEADPHONE JACK TEST SWITCH  BITE INDICATOR 
TEST  RESULTS 
POWER UP AND CONTINUOUS MONITORING  PASS FAIL  NO INDICATION, NORMAL AUDIO STATUS INDICATOR OFF, BITE INDICATOR ON 
SYSTEM TEST OPERATIONAL TESTS FOR EACH CHANNEL  PASS FAIL  STATUS INDICATOR COMES ON ONCE, NO INDICATION, NO TONE CHANNEL AUDIO 800 HZ TONE ON HEADPHONE 
23-71- 321 -VOICE RECORDER SYSTEM - TRAINING INFORMATION POINT - MAINTENANCE J a n u ary 20 05 

SOUTHWEST AIRLINES PROPRIETARY(c) All rights reserved
SOUTHWEST AIRLINES.
737-700 MAINTENANCE TRAINING MANUAL

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FLIGHT DATA RECORDER SYSTEM
(FDRS)
SELF-TEST
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SOUTHWEST AIRLINES.
737-700 MAINTENANCE TRAINING MANUAL

FDRS - SYSTEM TESTS
General
The FDAU and FDR do continuous self-tests. These tests are active when an engine is in operation or the airplane is in the air. For flight recorder system faults, the flight recorder light comes on.
　
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