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index or cruise altitude are not entered.
FMC RUNWAY
DISAGREE
Caution Beeper Airplane is not on FMC origin runway
when either engine's thrust is in the takeoff
range.
FMC UNABLE
RTA
Advisory The FMC is unable to achieve the required
time of arrival within the allowable time
error.
FMC VERIFY
POSITION
Advisory The FMC calculation of airplane position
is based on conflicting data.
GPS Advisory GPS has failed.
INERTIAL ALIGN
MODE
Meno Any two or more of the IRUs or AHRUs
are in the alignment mode.
787 Flight Crew Operations Manual
Flight Management, Navigation -
EICAS Messages
11.60.2 Boeing Proprietary
Message Level Aural Condition
INSUFFICIENT
FUEL
Advisory FMC estimated fuel at the destination is
less than the entered RESERVES fuel.
IRU ALIGN
MODE L
Memo Only the left IRU is in align mode.
IRU ALIGN
MODE R
Memo Only the right IRU is in align mode.
IRU ATT MODE L Advisory Left IRU has lost its alignment and is
operating in reversionary mode.
IRU ATT MODE R Advisory Right IRU has lost its alignment and is
operating in reversionary mode.
IRU /AHRU
MOTION
Advisory During inertial reference system
alignment, excessive airplane motion is
detected.
LNAV BANK
ANGLE LIM
Advisory LNAV is unable to maintain intended
curved path due to Bank Angle Limit.
NAV AIR DATA
SYS
Advisory Backup sources for airspeed and altitude
are being used instead of air data.
NAV AIRSPEED
DATA
Advisory Information from the pitot ADMs is not
sufficient to provide voted airspeed and
backup airspeed is displayed on the PFD.
NAV GPS
INERTIAL
Advisory Hybrid GPS IRU and GPS AHRU
functions have failed.
NAV INERTIAL
SYS
Caution Beeper IRS is not capable of providing valid
attitude, position, track, and groundspeed.
NAV UNABLE
RNP
Caution Beeper Navigation performance does not meet
required accuracy.
RWY/APP CRS
ERROR
Advisory The selected ILS course does not match
the FMC active arrival runway.
RWY/APP TUNE
ERROR
Advisory The tuned ILS frequency or GLS channel
does not match the FMC active arrival
runway.
SINGLE FMC Advisory Only a single FMC is operating.
SINGLE SOURCE
FD
Advisory Both PFDs are using the same source for
flight director information.
TCP ALTN NAV Advisory TCP alternate navigation function in use.
787 Flight Crew Operations Manual
Flight Management, Navigation -
EICAS Messages
Boeing Proprietary 11.60.3
FMC Messages
FMC messages indicate: degraded system operation, data input errors, or datalink
status. The messages are categorized as:
The CDU help window messages display according to their level of importance.
A less important message replaces another message in the CDU help window
when the CLEAR MSG key is pushed or the condition is corrected.
The EICAS displays the advisory message FMC MESSAGE when there is an
FMC alerting message. The EICAS displays the message •FMC when there is an
FMC communications message. Clear the message or correct the condition to
cancel the message.
FMC Alerting Messages
FMC alerting messages:
• display in the CDU help window
• cause the EICAS advisory message FMC MESSAGE to display.
Use the CLEAR MSG key or correct the condition responsible for the message to
remove the message.
Message Level Aural Condition
TRANSPONDER Advisory Transponders have failed.
TRANSPONDER
PANEL
Advisory Transponder panel is inoperative or TCP
control of transponder panel is active.
• alerting messages
• communications messages
• advisory messages
• entry–error advisory messages.
Help Window Title Condition Help Window Text
ALIGNMENT
REINITIATED
IRU alignment has
automatically
restarted due to
airplane motion
disturbing the
alignment process or
due to the crew
entered initial
position failing the
internal comparison
tests.
IRS ALIGNMENT FAILED -
AUTOMATICALLY
RESTARTED
787 Flight Crew Operations Manual
Flight Management, Navigation -
EICAS Messages
11.60.4 Boeing Proprietary
Help Window Title Condition Help Window Text
CHECK ALT TGT VNAV is selected
when the airplane is
between the MCP
window altitude and
the FMC target
altitude. VNAV holds
level flight.
VNAV TARGET ALTITUDE AND
MCP ALTITUDE DISAGREE RESET
MCP OR MODIFY
　
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