增强型近地警告系统 Enhanced Ground Proximity Warning 航线维护手册 Systems Line Maintenance Manual(19)

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Restricted Tests destroy data or take an excessive amount of time to complete and cannot be run during normal system operation.  These tests are usually run during system power up or during a cockpit initiated Self-Test.  These tests primarily consist of more thorough hardware checks that would disrupt normal operation if continuously run.

2.3.4 EGPWC FRONT PANEL
To aid in troubleshooting the EGPWS, the front panel of the Warning Computer provides indicators and user interfaces as follows.
2.3.4.1 EGPWS STATUS LED’S
Three LED’s on the EGPWC front panel provide a high level indication of overall system status.  These are:
.
a yellow “External Fault” LED

.
a green “Computer OK” LED

.
a red “Computer Fail” LED The yellow “External Fault” LED indicates that a fault external to the EGPWC exists.  The green “Computer OK” LED indicates that the EGPWC is operating correctly with no internal faults.  The red “Computer Fail” LED indicates that

the EGPWC has an internal fault.  Further explanation of internal and external faults is given in Section 3.4.1 and Section 3.4.2.

2.3.4.2 FRONT PANEL SELF-TEST INTERFACE (MK V AND MK VII ONLY)
The EGPWC front panel provides a Self-Test switch for activating Self-Test features described in Section 2.3.5. This switch functions the same as cockpit Self-Test switches.

2.3.4.3 AUDIO JACK (MK V AND MK VII ONLY)
The EGPWC front panel provides a headphone jack for use during Self-Test.  The audio jack is a standard 600Ω monophonic audio output compatible with a standard 2-connector ." audio plug headphones.

2.3.4.4 FRONT PANEL PCMCIA INTERFACE
For the MK V and MK VII, a PCMCIA card slot is provided in the front panel.  For the MK VI and MK VIII, the PCMCIA interface utilizes an external PCMCIA interface called a “SmartCable” connected to the front panel Test Connector.
The PCMCIA interface provides a data downloading capability (either loading a new database from a PCMCIA Card or downloading history data from the EGPWC to a Fault History Card).

2.3.4.5 FRONT PANEL TEST CONNECTOR
The EGPWC front panel Test Connector provides communications support capabilities intended for maintenance and test functions.  For the MK V and MK VII, this includes RS-232 and 422 communications.  For the MK VI and MK VIII, this includes RS-232, power, and signals used for PCMCIA (SmartCable) operation.  These serve as access to EGPWS signal monitoring, flight history, initiating BITE tests, updating databases, and other functions.  The interface is full duplex and is intended for human interaction using custom interface programs such as the Honeywell WinVIEWS. utility (see Appendix A).

 

2.3.5 SELF-TEST FUNCTIONS
The EGPWC supports a manually operated Self-Test sequence for indicating the operational status of the system. The Self-Test aurally enunciates the EGPWS status and activates outputs (lights and displays) for visual verification. The EGPWC Self-Test includes detailed configuration and status information for the EGPWC and aircraft installation, maintenance information detailing the cause of detected faults, and historical information about faults and alerts that occurred during previous flights.  The Self-Test Function can only be accessed while on the ground.
　
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