Technical data

Product Specification
HIF-2121/R5 CAGE CODE: 97896 SCALE: NONE SIZE: A DWG NO: 965-1176-601 REV: D SHEET 113
6.10.3.3.3 Alert History User Interface
The alert history data is accessible via the front panel test connector using a PC, or annunciated during the Flight history
audio readout. When the alert history is requested alert history records are scanned and formatted for enunciation or display.
6.10.3.4 Ground History
Ground history consists of Ground History Records stored by the EGPWS on the ground for the purpose of maintenance and
troubleshooting. The Ground History Record will be recorded based on a specific event INOP, self-test or present status.
Ground history information can be reviewed through the use of the RS-232 interface or uploaded through the PCMCIA
interface for later review.
6.10.3.5 Status History
Status history is used to identify EGPWS status such as database configuration changes, and in some cases, certain input
parameters during critical phases of EGPWS operation (e.g. takeoff, landing, change in configuration change, etc.) Status
history information can be reviewed through the use of the RS-232 interface, or uploaded through the PCMCIA interface for
later review.
6.10.3.6 Flight History Erase Function
Flight history erase is initiated via ATP or RS-232 functionality. Flight history erase will reset the flight leg counter and clear
from non-volatile memory ONLY the following flight history records:
Fault History Record
INOP History Record
Ground History Record
EGPWS Alert History Record
EGPWS Envelope Modulation Record
EGPWS Status Record
EGPWS Landing Record
EGPWS Configuration Record
NOTE: Flight history Erase will not reset any of the cumulative counters.
6.10.4 Front Panel
The EGPWC front panel consists of EGPWS status LEDs, a test connector, two main connectors, and where applicable a
GPS antenna connector. A diagram of the status LED’s is shown below:
Color Label
Yellow O EXTERNAL
FAULT
Green O COMPUTER
OK
Red O COMPUTER
FAIL
The EGPWC front panel status LEDs has three LEDs - a yellow external fault LED, a green Computer OK LED and a red
Computer Fail LED. The yellow external fault LED indicates that a fault external to the EGPWC exists - do not remove and
replace the EGPWC when this condition exists unless the red Computer Fail LED is also illuminated. All external faults
should be fixed prior to removing and replacing the EGPWC. The green Computer OK LED indicates that the EGPWC is
operating correctly with no internal faults - do not remove and replace the EGPWC when this condition exists. The red
Computer Fail LED indicates that the EGPWC has an internal fault - the EGPWC should be removed, replaced and repaired.
See table 6.10.4-1 for recommended maintenance actions for each status LED condition.