Honeywell MK VI Benutzerhandbuch

EGPWS LINE MAINTENANCE MANUAL 

CAGE CODE: 97896 

SCALE: NONE     SIZE: A 

DWG NO.:  060-4199-180 

REV:   G 

SHEET  27 of 68 

 

 

An internal fault indicates a problem with the EGPWC.  The following table lists the internal fault messages and the 
probable maintenance response. 

Note:  “NO FAULTS” is enunciated for Level 2 Self-Test if no faults are present. 

Enunciation: 

ROM FAILED 
RAM FAILED 
NVM RAM FAILED 
NVM FAILED 
WATCHDOG TIMER TEST FAILED 
EXCESSIVE WATCHDOG TIMEOUTS FAILURE 
ANALOG CONVERTER FAILED* 
VOICE GENERATOR FAILED 
ARINC 429 TRANSMITTER FAILED 
ARINC 429 RECEIVER FAILED 
FLASH FILE SYSTEM WRITE FAILED (fixed by MK VI, VIII, XXII Hardware Mod 2) 
APPLICATION DATABASE FAILED (DSP or CRC) 
TERRAIN DATABASE FAILED (CRC or Runway or Mag. Var.)*** 
TERRAIN DATABASE NOT COMPATIBLE 
ENVELOPE MODULATION DATABASE FAILED 
CONFIGURATION DATABASE FAILED (MK V/VII) 
APPLICATION DATABASE FAILED (MK VI/VIII/XXII ) 
CONFIGURATION DATABASE AAC DATA FAULT 
SYSTEM OR MODE TASK FAILED 
SUPPORT TASK FAILED 
INTERNAL GPS FAILED** 
APPLICATION SOFTWARE VERSION INVALID 
RCD FAILED (MK V/VII) 

Probable Cause: 

EGPWC failure 

Action: 

Remove and replace the EGPWC. 

Notes: If external faults also exist, these should be eliminated, and the internal faults rechecked before the EGPWC 
is removed and replaced. 

* Power unit on bench with parity pin strapped, and verify the failure is cleared. 

** If the EGPWC incorporates the integral Mercury GNSSU (-060 hardware part numbers), both internal and 
external faults will be indicated.  This fault can also be indicated if there is no antenna connection to the GNSSU. 
Before replacing the EGPWC/GNSSU, ensure that the antenna is connected and that no antenna wiring breaks 
exist. 

*** Invalid Latitude/Longitude causes a Mag Var table fault which may be annunciated as “Terrain Database Failed”  
This can be caused by not connecting the GPS antenna. 

 

 

An external fault indicates a problem with an external sensor, system, or wiring.  External faults are further broken 
down in to sub-categories; Discrete Faults, ARINC 429 Bus Activity Faults, Analog Input Wire Monitoring Faults, 
ARINC 429 Signal Faults, Analog Signal Faults, and Program Pin or Configuration Module Faults.  The following 
table provides a few examples of these.