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operation if continuously run.
(2) EGPWC FRONT PANEL
To aid in troubleshooting the EGPWS, the front panel of the Warning Computer
provides indicators and user interfaces as follows.
(a) 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.
(b) FRONT PANEL SELF-TEST INTERFACE
The EGPWC front panel provides a Self-Test switch for activating Self-Test
features. This switch functions the same as cockpit Self-Test switches.
(c) AUDIO JACK
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 ¼" audio plug headphones.
(d) FRONT PANEL PCMCIA INTERFACE
For the MK V and MK VII, a PCMCIA card slot is provided in the front panel. 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).
(e) FRONT PANEL TEST CONNECTOR
The EGPWC front panel Test Connector provides communications support
capabilities intended for maintenance and test functions. For the MK V, this
includes RS-232 and 422 communications. 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.
(3) SELF-TEST FUNCTIONS
(a) 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
For Training Purpose Only Printed:May 2005
B757-200Aircraft Recur rent Training Manual - 15 -
during previous flights. The Self-Test Function can only be accessed while on the
ground.
NOTE: Self-Test can be inhibited based on several configuration conditions
(b) EGPWS Self-Test is divided into six levels:
• Level 1 — Identifies the status of each of the major functions of the EGPWS. This
is the normal pre-flight test performed by the flight crew.
Level 1 Self-Test provides an overview of the current operational capability of the
EGPWS. It is divided into 3 functions - the Preamble, Short Level 1 Self-Test, and
Long Level 1 Self-Test. During Level 1 Self-Test, a Short Cancel terminates the
Self-Test level and “CURRENT FAULTS” is enunciated to indicate activation of
Level 2 Self-Test. A Long Cancel terminates the entire Self-Test sequence exiting
Self-Test.
The Short Level 1 Self-Test is intended to provide a Go/No Go confidence test to
indicate EGPWS functionality. It indicates which Modes of the EGPWC are
currently not available and activates system outputs. The short Level 1 Self-Test is
a subset of the Long Level 1 Self-Test.
The Long Level 1 Self-Test is initiated by pressing and holding Self-Test until
Self-Test voices start. The Long Level 1 Self-Test enunciates all configured and
activated alert voices, including warning voices, caution voices, and altitude callout
voices immediately following the Short Level 1 Self-Test sequence.
• Level 2 — Identifies all failures currently within the system. Level 2 is accessed
by maintenance personnel to help resolve INOP conditions.
Level 2 Self-Test provides enunciation of all faults existing at the time of the test
request. Level 2 Self-Test is initiated by pressing Self-Test within 3 seconds of the
end of Level 1 Self-Test or following a short cancel during Level 1 Self-Test.
During Level 2 Self-Test, a Short Cancel or Long Cancel terminates the Self-Test
level and “PRESS TO CONTINUE” is enunciated for proceeding to Level 3
Self-Test. GPWS INOP, Windshear INOP, and Terrain INOP (or Terrain Not
Available) lights are turned on (or remain on) for the duration of the Level 2
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