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787 Flight Crew Operations Manual
Flight Management, Navigation -
FMC Descent and Approach
Boeing Proprietary 11.43.21
Displays the identifier of the four alternate airports in ETA order when airborne;
and, in distance order when on the ground.
Valid manual entry is an airport from the navigation database.
A manual entry into a field displaying a small font value overwrites the small font
value, but does not delete it from the Alternates Candidates list. After predictions
are complete, the overwritten small font value is placed on the list according to
ETA order. A manual entry into a field displaying a large font value overwrites and
deletes the large font value. Manual entries display in large font.
1 Alternate Airports
<
K D E N
K R A P
KB IL
<
ACT RTE X
E T A
1 7 5 0 Z
1 7 3 5 Z
1 7 3 0 Z
F U E L
1 / 2
1 / X
2 5 . 0
2 3 . 7
4 3 . 3
A L T N I N H I B I T
W X R K M W H
A L T N
Z
>
>
>
1815 >
REQUEST
<REQUEST
KMWH <SEL>
LTN
13.7
DIVERT NOW
----/----
ALTN
INIT/REF INDEX
A
>
FMC COMM
ALTN>
ALTN
1
2
3
8
9
4
5
6
7
787 Flight Crew Operations Manual
Flight Management, Navigation -
FMC Descent and Approach
11.43.22 Boeing Proprietary
The DELETE function key can be used to remove manually entered alternate
airports from the ALTN page.
Push – transmits a datalink request for a preferred list of alternates (up to four).
Uplinked airports display in ETA order but are assigned a preference number by
the transmitting site. The CDU help window message ALTN UPLINK is
displayed when the alternate airport data arrives.
Push – transmits a datalink request for alternate airport weather data.
ETA is calculated based on the routing, altitude, and speed displayed on the
XXXX ALTN page.
Displays the alternate airport ETA.
Blank when airplane is on the ground.
Predicted arrival fuel is calculated based on the routing, altitude, and speed
displayed on the XXXX ALTN page. The message UNABLE FUEL displays in
the FUEL column if the predicted arrival fuel is less than zero.
Displays the alternate airport predicted arrival fuel.
Blank when airplane is on the ground.
The selected alternate is identified with an <A> or <SEL> to the right of the
airport identifier.
The FMC selects the alternate airport with the earliest ETA. FMC selected
alternates display <A> to the right of the airport identifier.
A manual selection of an alternate airport is made by pushing the line select key
left of the airport identifier. Manually selected alternates display <SEL> to the
right of the airport identifier.
Entering a new airport into the list of four does not select the new airport.
Use the DELETE function key on a manually selected alternate to remove <SEL>.
The automatic selection function selects a new alternate.
Push - displays the XXXX ALTN page for the alternate airport adjacent to the >
prompt.
An airport will not be one of the four alternate airports if entered into the alternate
inhibit line.
2 Alternate Request (ALTN REQUEST)
3 Weather Request (WXR REQUEST)
4 ETA
5 FUEL
6 Selected (<SEL>)
7 Alternate Select
8 Alternate Inhibit (ALTN INHIBIT)
787 Flight Crew Operations Manual
Flight Management, Navigation -
FMC Descent and Approach
Boeing Proprietary 11.43.23
One or two airports can be entered.
Alternate inhibits can be manually entered or uplinked. The inhibited airports may
be uplinked with the ALTN UPLINK or separately. If uplinked separately, the
CDU help window message ALTN INHIBIT UPLINK is displayed.
Valid entries are airports from the navigation database.
Selecting DIVERT NOW displays the route from the present position to the
selected alternate using the route displayed on the XXXX ALTN page for the
diversion airport. The details of the route can be confirmed or modified before the
diversion is executed.
Execution of the diversion:
• changes the route destination airport
• includes the route modification into the active flight plan
• deletes all parts of the original route that are not part of the diversion
• if a descent path exists, deletes all descent constraints (the CDU help
widow message DESCENT PATH DELETED displays when DIVERT
NOW is selected).
After a divert is executed the XXXX ALTN page is not updated until all CDU
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787机组操作手册Flight Crew Operations Manual 3(85)
