2.3.4 EGPWC Front Panel.............................................................................................................................. 18

2.3.5 Self-Test Functions................................................................................................................................19

3 FAULT ISOLATION (TROUBLESHOOTING)...................................................................................................... 20

3.1 GENERAL ................................................................................................................................................................ 20

3.2 TROUBLESHOOTING GUIDE ......................................................................................................................................20

3.3 LEVEL 1 SELF-TEST -GO/NO GO TEST ..................................................................................................................... 21

3.3.1 self-test Preamble..................................................................................................................................21

3.3.2 Short Level 1 Self-Test .......................................................................................................................... 22

3.3.3 Long Level 1 Self-Test...........................................................................................................................23

3.4 LEVEL 2 SELF-TEST -CURRENT FAULTS...................................................................................................................23

3.4.1 Current Faults - Internal.........................................................................................................................24

3.4.2 Current Faults - External........................................................................................................................ 25

3.5 LEVEL 3 SELF-TEST - SYSTEM CONFIGURATION.......................................................................................................30

3.6 LEVEL 4 SELF-TEST - FAULT HISTORY ..................................................................................................................... 32

3.7 LEVEL 5 SELF-TEST - ALERT HISTORY.....................................................................................................................32

3.8 LEVEL 6 SELF-TEST - DISCRETE INPUT TEST ........................................................................................................... 33

3.8.1 ARINC 552 / ALT 55 Radio Altitude Validity Flag discretes................................................................... 33

3.8.2 GND Landing Gear Discrete..................................................................................................................34

3.8.3 +28V Landing Gear Discrete ................................................................................................................. 34
　
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