The master warn and red aural alert are disabled for any of the
following red messages when the inhibit function is active:
● APU FIRE
. CABIN DFRN - 9.8
. MAIN
DOOR
. CABIN PRESSURE LOW
c DAU 1-2 MISCMP - MSG
All other
red messages activate the master warn and red aural
alert.
The following amber messages are not inhibited when the inhibit
function is active:
.
CAT 2 INVALID (Option)
● CPL DATA INVALID
2. F. (3) CAS Computed System Messages
The majority of the messages displayed by the crew alerting system
are generated directly from logic within a particular aircraft
system.
The messages described in this section are computed by the
fault warning computer based on multiple system inputs.
(a)
(b)
(c)
DAU 1-2 MISCMP-MSG Red Message - The fault warning computer
compares the red message activation logic between each channel
(A and B) of a particular DAU. If a difference is detected
between the DAU channels, the miscompare message is activated
as appropriate (i.e., DAU 1, 2, or 1-2).
CHECK PFD Red Message
- This message is active anytime the
CHECK DU message is active from both the pilot’s and copilot’s
primary flight displays (PFD).
The CHECK DU
messages, relative
to the PFDs, are suppressed whenever the CHECK PFD message is
active.
Refer to the next paragraph for the CHECK DU message
definition.
CHECK
DU 1-2-5-6 Amber Message - Each display unit (DU)
transmits data to the fault warning computer over a private-
line data bus. The content of the data varies depending on DU
position and display format. All DUS transmit activity counter
information.
The DUS displaying the PFD format additionally
transmit attitude (pitch and roll), speed (CAS or Mach), and
altitude information.
The CHECK DU message is activated
whenever the conditions for any one of the following criteria
are met:
22-14-00
Page 288
Aug 15/91
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