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EGPWS LINE MAINTENANCE MANUAL
CAGE CODE: 97896 SCALE: NONE SIZE: A DWG NO.: 060-4199-180 REV: G SHEET 5 of 68
TABLE OF CONTENTS
1 INTRODUCTION.....................................................................................................................................................8
1.1 SCOPE......................................................................................................................................................................8
1.2 APPLICABILITY...........................................................................................................................................................8
1.3 REFERENCE DOCUMENTS..........................................................................................................................................9
2 DESCRIPTION AND OPERATION ......................................................................................................................10
2.1 GENERAL SYSTEM DESCRIPTION..............................................................................................................................10
2.1.1 Enhanced Ground Proximity Warning Computer (EGPWC).....................................................................11
2.2 OPERATION.............................................................................................................................................................11
2.2.1 Mode 1 – Excessive Descent Rate ...........................................................................................................11
2.2.2 Mode 2A/2B - Terrain Closure Rate..........................................................................................................11
2.2.3 Mode 3 - Descent After Takeoff ................................................................................................................11
2.2.4 Mode 4A/4B/4C - Unsafe Terrain Clearance ............................................................................................11
2.2.5 Mode 5 - Descent Below Glideslope .........................................................................................................12
2.2.6 Mode 6 - Advisory Callouts (optional) .......................................................................................................12
2.2.7 Mode 7 - Windshear Detection (Optional for MK V/VII only).....................................................................14
2.2.8 Envelope Modulation (not available in MK VI/VIII -001)............................................................................14
2.2.9 Terrain Clearance Floor and Runway Field Clearance Floor ...................................................................14
2.2.10 Terrain Alerting and Display (optional)......................................................................................................15
2.2.11 Peaks Display Mode (optional)..................................................................................................................16
2.2.12 Geometric Altitude (GPS Required) ..........................................................................................................16
2.2.13 Weather Radar AutoTilt (MK V and MK VII only) ......................................................................................16
2.2.14 System Display and Annunciation.............................................................................................................17
2.2.15 Runway Awareness and Advisory System (option for MK V and MK VII only).........................................17
2.2.16 Stabilized Approach Monitor (option for MK V and MK VII only) ..............................................................17
2.2.17 Altimeter Monitor (option for MK V and MK VII only) ................................................................................17
2.2.18 Takeoff Flap Configuration Monitor (option for MK V and MK VII only)....................................................18
2.2.19 Long Landing Monitor (option for MK V and MK VII only).........................................................................18
2.2.20 Low Airspeed Monitor (MK V Boeing 737NG only)...................................................................................18
2.2.21 Lamp Format .............................................................................................................................................19
2.3 SYSTEM MAINTENANCE............................................................................................................................................20
2.3.1 Maintenance Philosophy ...........................................................................................................................20
2.3.2 System Operation During an Inop Condition.............................................................................................20
2.3.3 BIT Description..........................................................................................................................................20
2.3.4 EGPWC Front Panel .................................................................................................................................21
2.3.5 Self-Test Functions....................................................................................................................................22
3 FAULT ISOLATION (TROUBLESHOOTING) .....................................................................................................23
3.1 GENERAL................................................................................................................................................................23
3.2 TROUBLESHOOTING GUIDE ......................................................................................................................................23
3.3 LEVEL 1 SELF-TEST - GO/NO GO TEST ....................................................................................................................24
3.3.1 Self-Test Preamble....................................................................................................................................24
3.3.2 Short Level 1 Self-Test..............................................................................................................................25
3.3.3 Long Level 1 Self-Test...............................................................................................................................26
3.4 LEVEL 2 SELF-TEST - CURRENT FAULTS...................................................................................................................26
3.4.1 Current Faults - Internal ............................................................................................................................27
3.4.2 Current Faults - External ...........................................................................................................................27
3.5 LEVEL 3 SELF-TEST - SYSTEM CONFIGURATION........................................................................................................33
3.6 LEVEL 4 SELF-TEST - FAULT HISTORY......................................................................................................................36
3.7 LEVEL 5 SELF-TEST - ALERT HISTORY......................................................................................................................37
3.8 LEVEL 6 SELF-TEST - DISCRETE INPUT TEST ............................................................................................................37
3.8.1 ARINC 552 / ALT 55 Radio Altitude Validity Flag Discretes .....................................................................38
3.8.2 GND Landing Gear Discrete .....................................................................................................................38