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messages. To ensure all valid CAS messages
can be seen when appropriate, the CAS message
window uses a “scrolling list” of all the
current valid CAS messages. If more than 14
messages are valid, a scroll bar appears on
the right side of the CAS message window
(Figure 4-4). A slider in the scroll bar indicates
which portion of the list is currently visible.
Red warning messages always stay at the top
of the CAS messages and are unaffected by
scrolling.
Amber caution messages can run off of the display.
If an amber message scrolls off, or if there
are too many messages to display all active
amber messages, the scrollbar track changes
color to reflect the color of the message.
At the same time, CAS-scroll buttons (one with
an up-arrow and one with a down-arrow) appear
on the soft keys at the bottom of the display, allowing
the pilot to scroll up or down through the
current list of CAS messages. When the top of
the list is visible, only the CAS down-arrow
scroll button appears among the soft keys. When
the bottom of the list is displayed, only the CAS
up-arrow scroll button appears.
CAS Message Inhibits
Many CAS messages are inhibited (prevented)
from displaying during certain phases of aircraft
operation, regardless of whether the
CAS message would otherwise be valid or
not. These inhibits reduce pilot workload or
prevent invalid indications during certain
phases of aircraft operation. Different CAS
messages are inhibited by different phases of
aircraft operation.
510OM-00 4-7
CAS
OIL PRESS LO L
CABIN ALT
T2 HTR FAIL R
W/S O’HEAT L
W/S A/I FAIL L
FUEL PRES LO R
ENG A/I COLD L
CABIN DOOR
AFT DOOR
P/S HTR L
F/W SHUTOFF R
FDR FAIL
SURFACE DE-ICE
SPD BRK EXTEND
CAS CAS
CAS
OIL PRESS LO L
CABIN ALT
AFT DOOR
P/S HTR L
F/W SHUTOFF R
FDR FAIL
SURFACE DE-ICE
SPD BRK EXTEND
FUEL TRANSFER
FUEL BOOST R
CAS CAS
Figure 4-4. CAS Scroll Buttons
CITATION MUSTANG OPERATING MANUAL
4-8 510OM-00
There are six phases of aircraft operations that
inhibit various CAS messages:
• Engine start inhibit (ESI)
• Takeoff operational phase inhibit (TOPI)
• On ground/in flight (GROUND/AIR)
• Landing operational phase inhibit
(LOPI)
• Engine shutdown inhibit (ESDI)
• Emergency power mode (EMER)
Engine Start Inhibit
When an engine is starting, the ESI for that engine
inhibits some CAS messages for that engine
and related systems. This inhibit is
triggered by the full-authority digital engine
control (FADEC). Each FADEC only inhibits
messages from its side.
Takeoff Operational Phase Inhibit
The TOPI prevents messages from distracting
the flightcrew during takeoff.
TOPI becomes active when any of the following
is true:
• The aircraft transitions from on ground
to in air.
• Either indicated airspeed transitions from
less than 50 knots to more than 50 knots.
The TOPI becomes inactive when any of the
following is true:
• The aircraft has been in the air for more
than 25 seconds.
• Pressure altitude is more than 400 feet
above the field elevation. The field elevation
is the pressure altitude captured
when the aircraft transitions from on
ground to in air.
• Either airspeed indication is less than 40
knots.
• Both airspeed indications are invalid.
• The TOPI has been active for more than
90 seconds.
On Ground/In Flight
Messages with the GROUND inhibit do not
appear when the aircraft is on the ground,
and messages with the AIR inhibit do not appear
when the aircraft is in flight. The inhibits
are normally controlled by squat switch
indications, but if that fails then GPS ground
speed and air data computer (ADC) are alternate
sources used by the CAS for setting these
inhibits.
Landing Operational Phase Inhibit
LOPI activates when any of the following
occurs:
• The aircraft transitions from in air to on
ground.
• Global positioning system (GPS) altitude
transitions below 400 feet above
field elevation stored in the terrain database.
LOPI becomes inactive when any of the following
is true:
• The aircraft has been on the ground for
more than 25 seconds.
• Either indicated airspeed is less than 40
knots.
• Both indicated airspeeds are invalid.
• The LOPI has been active for more than
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