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 APPLICATION DATABASE FAILED (DSP or CRC) TERRAIN DATABASE FAILED (CRC or Runway or Mag. Var.) ENVELOPE MODULATION DATABASE FAILED CONFIGURATION DATABASE FAILED (MK V/VII) APPLICATION DATABASE FAILED (MK VI/ MK VIII) CONFIGURATION DATABASE AAC DATA FAULT SYSTEM OR MODE TASK FAILED SUPPORT TASK FAILED INTERNAL GPS FAILED**
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.
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.
TABLE 3-3: CURRENT FAULTS - EXTERNAL (EXAMPLES)
FAULT EXAMPLE REASON
ARINC 429 Bus Fault GPS BUS 1 INACTIVE No expected input labels received for more than 4 seconds
ARINC 429 Signal Fault ILS BUS 1 GLIDESLOPE FAULT FW The SSM of the input data indicates Failure/Warning Note: Only the RS232 present Status will report the ‘FW” part of the fault.
ARINC 429 Signal Fault ILS BUS 1 GLIDESLOPE FAULT UPD The input label is not meeting the required update rate. Note: Only the RS232 present Status will report the ‘UPD” part of the fault.
Analog Signal Fault RADIO ALTIMETER 1 WIRING FAULT Open wire monitoring has detected no connection.
AOA UNREASONABLE FAULT AOA is not within 4 degrees of waterline during takeoff roll (60-90 knots). Incorrect Aircraft Configuration or AOA potentiometer is Worn.
Discrete Input Faults FLAP SWITCH FAULT Indicates Landing Flaps for > 60 seconds with an airspeed > 250 knots, or indicates Not Landing Flaps for more than 2 seconds with “Too Low Flaps” message below 100 feet.
GEAR SWITCH FAULT Indicates Landing Gear for > 60 seconds with an airspeed > 290 knots, or indicates Not Landing Gear for more than 2 seconds with “Too Low Gear” message below 100 feet.
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