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YELLOW  GREEN  OFF  TROUBLESHOOT EXTERNAL FAULTS USING LVL 2 SELF-TEST. DO NOT REMOVE OR REPLACE EGPWS. EXTERNAL FAULT 
OFF  OFF  OFF  ENSURE THAT POWER IS APPLIED 
OFF  OFF  RED  PERFORM LVL 2 SELF-TEST. REMOVE EGPWS AS REQUIRED INTERNAL FAULT 
OFF  GREEN  RED  INVALID STATE. PERFORM LVL 2 SELF-TEST IF POSSIBLE. REMOVE EGPWS AS REQUIRED. INTERNAL FAULT 
YELLOW  OFF  OFF  SELF-TEST IF POSSIBLE. REMOVE EGPWS EXTERNAL FAULT INVALID STATE. PERFORM LVL 2 AS REQUIRED. 
YELLOW  OFF  RED  INVALID STATE. PERFORM LVL 2 SELF-TEST IF POSSIBLE. REMOVE EGPWS AS REQUIRED. BOTH INTERNAL AND EXTERNAL FAULTS 
YELLOW  GREEN  RED  INVALID STATE. PERFORM LVL 2 SELF-TEST IF POSSIBLE. REMOVE EGPWS AS REQUIRED. INTERNAL FAULT 

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GPWS - STATUS LEDS

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AIR TRAFFIC CONTROL SYSTEM
(ATC)
SELF TEST

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SOUTHWEST AIRLINES.

ATC SYSTEM - SELF TEST
General
Push the TEST switch on the front of the transponder or select TEST on the ATC/TCAS control panel to start a self-test of the ATC system. During the test, the transponder BITE circuits do these functions:
-Normal operation test
-Memory tests
-Simulated interrogation test of the receiver circuits
-Antenna impedance test
-TCAS interface test
-Valid control and altitude inputs monitor.

Test From the Front Panel
Push and hold the test switch. All front panel light emitting diode (LED) status indicators come on for three seconds. Then all the LEDs go off for two seconds. Continue to hold the test switch to see the applicable LEDs come on to show the condition of the ATC transponder system.
These are the LED status indicators and their related conditions:
-TPR green - no LRU failures
-TPR red - LRU failure
-ALT - altitude input from the ADIRU fails
-DATA IN - control panel input fails
-TOP - top antenna fails
-BOT - bottom antenna fails
-TCAS - interface with TCAS fails
-MAINTENANCE - not used
-RESERVED (2) - not used.

737-700 MAINTENANCE TRAINING MANUAL
Test From the Control Panel
Set the transponder mode selector to the TEST position to start a self-test of the ATC system. The ATC FAIL light comes on for three seconds and then goes off if the test is successful. The ATC FAIL light stays on for any of these conditions:
-Antenna failure
-Transponder failure
-Control data failure

ATC PANEL REPLACABLE PARTS
TCAS RANGE KNOB
-KNOB = SI 1340208
-SET SCREWS = SI 1340209 (2)

TRANSPONDER MODE SELECTOR KNOB
-KNOB = SI 1340206
-SET SCREWS = SI 1340212 (2)

TRANSPONDER CODE SELECTOR KNOBS
-OUTER KNOB = SI 1340205
-OUTER KNOB SET SCREWS = SI 1340211 (2)
-INNER KNOB = SI 1340207
-INNER KNOB SET SCREWS = SI 1340210 (2)

SPLINE WRENCH TOOL KIT = SI 1981609

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

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LED STATUS

 

ATC TPR/MODE S
BENDIX/KING
INDICATORS
TPR
PUSH AND HOLD
ALT
TEST SWITCH
DATA IN
OR SELECT AND
TOP

ATC TPR/MODE S
BOT
HOLD TEST
BENDIX/KING
TCAS MAINTENANCE
　
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