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Self-Test.
• Level 3 — Identifies the configuration status of the Warning Computer and the
installation.
A Level 3 Self-Test enunciates EGPWC configuration information. Level 3 is
accessed while the aircraft is on the ground by pressing the EGPWS test switch
within 3 seconds of the “PRESS TO CONTINUE” message at the end of the Level
2 test. The message “SYSTEM CONFIGURATION” will be enunciated when Level
3 starts.
During a Level 3 Self-Test, a short cancel bumps the enunciation to the next Level
3 item (e.g. from terrain database information to envelope modulation database
information). A long cancel terminates the Self-Test level and “PRESS
TO CONTINUE” is enunciated for proceeding to Level 4 Self-Test.
• Level 4 — Identifies faults that have occurred during past flights. This information
can be used to resolve system problems reported by the flight crews.
Level 4 Self-Test provides enunciation of the faults recorded over the last 10 flight
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legs. Level 4 Self-Test is initiated by pressing the cockpit Self-Test button within 3
seconds of the end of Level 3 Self-Test.
If any faults were recorded in the last ten flight legs then voice sequence as
described in the following table will be enunciated. Otherwise, the message “NO
FAULTS” will be enunciated.
During Level 4 Self-Test, a Short Cancel bumps the enunciation to the next flight
leg with faults (if any).
During Level 4 Self-Test, a Long Cancel terminates the Self-Test level and
“PRESS TO CONTINUE” is enunciated for proceeding to Level 5 Self-Test.
• Level 5 — Identifies alerts that have occurred during past flights. This information
can be used to resolve system problems reported by the flight crews.
Level 5 Self-Test provides enunciation of the alerts (cautions and warnings)
recorded over the last 10 flight legs. Level 5 Self-Test is initiated by pressing the
cockpit Self-Test button within 3 seconds of the end of Level 4 Self-Test.
If any alerts were recorded in the last ten flight legs then voice sequence as
described in the following table will be enunciated. Otherwise, the message “NO
WARNINGS” will be enunciated.
During Level 5 Self-Test, a Short Cancel bumps the enunciation to the next flight
leg with faults (if any).
During Level 5 Self-Test, a Long Cancel terminates the Self-Test level and
“PRESS TO CONTINUE” is enunciated for proceeding to Level 6 Self-Test.
• Level 6 — Identifies state changes in the input discretes. This information can be
used to verify the installation and proper function of all discrete
inputs.
Level 6 Self-Test provides enunciation of any changes in the status of discrete
inputs for verification proper function and discrete input wiring. Level 6 Self-Test is
initiated by pressing the cockpit Self-Test button within 3 seconds of the end of
Level 5 Self-Test. The results are indicated in the following sections.
If a state change occurs on any discrete input (other than the Self-Test input as it is
directly tested in its use to control the test sequences), the EGPWC will annunciate
the functional name of the discrete followed by its new state. For example, if the
Glideslope Cancel discrete input in the current configuration is defined as ground =
cancel, and the discrete transitions from open to ground, Level 6 Self-Test will say:
“GLIDESLOPE CANCELED”. If the input is only momentarily grounded Level 6
Self-Test will say: “GLIDESLOPE CANCELED - GLIDESLOPE ENABLED.”
NOTE: Not all discretes are used in an installation; therefore, unused discretes
shall not apply. See aircraft wiring diagrams to determine applicable
discretes.
During Level 6 Self-Test the message “DISCRETE INPUT TEST - PRESS TO
CANCEL” is enunciated every 60 seconds. This provides additional evidence;
along with the continued illumination of the INOP lights/fail annunciations, that
Self-Test is still in progress.
During Level 6 Self-Test, a Short Cancel or Long Cancel terminates Self-Test and
“END OF SELF-TEST” is enunciated. As with all Self-Test levels, if the aircraft
goes in air, then Self-Test is terminated.
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(c) Self-Test aural is heard over the cockpit speaker, or through the headphone jack
on the EGPWC front panel. Details of these Self-Test levels are provided in Fault
Isolation section
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