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AURAL/VISUAL WARNING
For Training Purposes Only
May 03
3-5
P I LOT T R A I N I N G GU I D E
Should one channel of the LDU fail, the remaining channel continues to operate.
Testing the LDU and panel lamps is accomplished by using the test switch located on
the miscellaneous test panel. The three-position LAMP TEST switch is spring-loaded
to the center OFF position. Holding the switch to position 1 or 2 tests the associated
LDU channel and lamps.
AC power is required to perform the lamp test.
NOTE
AURAL/VISUAL WARNING
3-6 For Training Purposes Only
May 03
P I LOT T R A I N I N G GU I D E
Controls and Indicators
Master Warning Switch/Lights
The master warning switch/lights are located on the glareshield. When the DCUs
generate a warning message, the two master warning switch/lights flash red. A triple
attenson always accompanies the master warning lights and, in addition, dedicated
tones or voice messages may sound.
When the switch/light is pressed, the flashing red light and the audio alerts are reset.
Master Caution Switch/Lights
The master caution switch/lights are located on the glareshield. When the DCUs
generate a caution message, the two master caution switch/lights flash amber. A single
attenson always accompanies the master caution lights.
When the switch/light is pressed, the flashing amber light is reset.
Master Warning and Caution Lights
Figure 3-3
LH ENG
FIRE
PUSH
GPWS
TERR
INHB
MASTER
WARNING BOTTLE 1
ARMED
PUSH TO
DISCH
STALL
MASTER
CAUTION
PULL UP
GND PROX
ATS
N2 SYNC
ATS
N1 TO
FAIL
ATS
N1 TO
FAIL
APU
FIRE
PUSH
RH ENG
FIRE
PUSH
GPWS
TERR
INHB
MASTER
BOTTLE 2 WARNING
ARMED
PUSH TO
DISCH
BOTTLE
ARMED
PUSH TO
DISCH
STALL
MASTER
CAUTION
PULL UP
GND PROX
RIGHT GLARESHIELD
P604_03_003
LEFT GLARESHIELD
AURAL/VISUAL WARNING
For Training Purposes Only
May 03
3-7
P I LOT T R A I N I N G GU I D E
Aural Warning Testing
A two-position spring-loaded to neutral AURAL WARN TEST switch is located on
the miscellaneous test panel. The switch is used to test the audio outputs of the DCUs.
When the switch is selected to position 1 or 2 and released, DCU 1 or DCU 2 aural and
voice warnings are sounded sequentially. When the switch is selected again, the test is
interrupted.
AURAL WARN / LAMP TEST Panel
Figure 3-4
Aural Warning Test Sounds
Table 3-1
SOUND INDICATION
WARBLER STALL
FIRE BELL FIRE WARNING
CLACKER VMO / MMO, FLAP OVERSPEED
CLACKER “DRUM ROLL” EXCESSIVE STAB TRIM MOVEMENT
CAVALRY CHARGE AUTOPILOT DISCONNECT
HORN GEAR NOT DOWN
C-CHORD ALTITUDE ALERT
DOUBLE C-CHORD VERTICAL TRACK ALERT
TRIPLE ATTENSON PRECEDES ANY WARNING MESSAGE
SINGLE ATTENSON PRECEDES ANY CAUTION MESSAGE
VOICE VOICE WARNINGS
P604_03_004
AURAL
WARN TEST
LAMP
TEST
1
2
1
2
AURAL/VISUAL WARNING
3-8 For Training Purposes Only
May 03
P I LOT T R A I N I N G GU I D E
Aural Alert Disable
Two (third optional) DISABLE switch/lights, located on the AUDIO WARNING
panel on the copilot side console, are used to disable and silence the aural warnings of
a malfunctioning DCU. When DCU 1 is selected to DISABLE, DCU 2 will provide
the aural warning function. When both DCU 1 and 2 are disabled, the optional DCU 3
(if installed) provides the aural warnings. The ground proximity warning system
(GPWS) and the traffic alert and collision avoidance system (TCAS) aural warnings
are not disabled by selections at the audio warning panel.
DCU Disable Controls
Figure 3-5
In order to test DCU 3 audio warnings, DCU 1 or 2 must be
disabled from the audio warning disable panel.
EICAS Control Panel
PRI
Selecting PRI causes the primary page to be displayed on ED 1.
STAT
Pressing the STAT button causes the status page to be displayed on ED 2. If the status
page is already displayed, the button will remove the status message(s) and display a
white MSGS icon. Pressing the STAT a second time will cause the status message(s) to
reappear. DCU generation of a new status message will remove the MSGS icon and
the new status message will be displayed on the top of the status message stack.
NOTE
DCU 1 DCU 2 DCU 3
AUDIO WARNING
DISABLE DISABLE DISABLE
P604_03_005
AURAL/VISUAL WARNING
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