Honeywell MK XXII, MK VIII manual Current Faults - Internal, Current Faults - External

EGPWS LINE MAINTENANCE MANUAL

3.4.1 CURRENT FAULTS - INTERNAL

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:

Probable Cause:

Action:

TABLE 3-2: LEVEL 2 SELF-TEST - INTERNAL FAULTS

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)

EGPWC failure

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.

3.4.2 CURRENT FAULTS - EXTERNAL

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.

CAGE CODE: 97896 SCALE: NONE SIZE: A DWG NO.: 060-4199-180 REV: G SHEET 27 of 68