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Push – displays the INIT/REF INDEX page.
Airline Policy
The airline policy pages display operating parameters kept in the airline
maintained file. The FMC references this file for data before it calculates default
values. These pages are not usually used by the flight crew.
1 AIRLINE POLICY
2 INERTIAL MONITOR
3 INDEX
INIT/REF INDEX
MAINT>
- -
MAINTENANCE INDEX
<INERTIAL MONITOR
<AIRLINE POLICY
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
<INDEX
2
1
3
787 Flight Crew Operations Manual
Flight Management, Navigation -
Flight Management System
Operation
11.31.6 Boeing Proprietary
Push – displays the AIRLINE POLICY 1/2 page.
Navigation Position
The FMC determines present position from these navigation systems: IRS, GPS,
and navigation radios.When receiving reliable GPS data, the primary mode of
navigation is from a GPS updated FMC position. If GPS data is not available,
cannot be validated, or is inhibited, the FMC position is updated using navigation
radios. When navigation radios are not available or not reliable, the FMC position
comes from the IRUs.
FMC Position Update
FMC position may be manually updated to any of the navigation system positions.
This update is accomplished on POS REF page 2.
On the ground, the FMC calculates present position based on IRS and/or the GPS
data.
With GPS NAV OFF, pushing a TO/GA switch updates the FMC position to the
takeoff runway threshold or to the position shift position, when entered. When
making an intersection takeoff, the intersection displacement distance from the
runway threshold must be entered on the TAKEOFF REF page. With GPS NAV
ON, the TO/GA update is inhibited.
In flight, the FMC position is continually updated from the GPS, navigation
radios, and IRS. Updating priority is based on the availability of valid data from
the supporting systems.
The FMC automatically tunes VOR, DME, and ILS radios for position updating
and displays them on the ND and NAV RADIO page. Selection is related to the
active route and any procedure (SID, STAR, etc.) in the active route. Manually
selecting VOR frequencies or identifiers precludes the FMC from autotuning
other VOR/DME frequencies for position updating; however, the FMC continues
to tune DME-DME pairs for position updating.
FMC position updating using the IRS and navigation sensor positions occurs in
the following priority order:
• LOC and GPS
• LOC and DME-DME
• LOC and collocated VOR/DME
• IRS and LOC
• IRS and GPS
• IRS and DME-DME
• IRS and a collocated VOR/DME
• IRS
787 Flight Crew Operations Manual
Flight Management, Navigation -
Flight Management System
Operation
Boeing Proprietary 11.31.7
The selected station identifiers of the radio navigation aids display on the POS
REF page 2.
Primary FMC Position Update Source POS REF page
2/4
ND Annunciation
LOC, GPS valid* LOC–GPS LOC–GPS
LOC, DME DME valid; GPS invalid* LOC–RADIO LOC–DME–DME
LOC, VOR DME valid; GPS invalid* LOC–RADIO LOC–VOR–DME
LOC valid; GPS, DME, VOR invalid* LOC LOC
GPS valid, LOC invalid GPS GPS
DME valid; GPS invalid RADIO DME–DME
VOR DME valid; GPS invalid RADIO VOR–DME
GPS, VOR, DME invalid INERTIAL INERTIAL
GPS valid, IRS failed GPS GPS
GPS invalid; IRS failed blank map not available
* The FMC changes to LOC updating when:
• a localizer-based approach procedure is selected
• the airplane heading is within 45° of the localizer course
• the airplane is within 20 nm of the destination airport
• the airplane is within 2.5° of the localizer center
787 Flight Crew Operations Manual
Flight Management, Navigation -
Flight Management System
Operation
11.31.8 Boeing Proprietary
FMC Polar Operations
When entering the polar region, automatic switching to a true north reference is
annunciated by a flashing white box around the word TRU on both the ND and
PFD. A true heading reference can be selected by placing the heading reference
switch to TRUE inside or outside the polar region. The ND and PFD display a
green box around the word MAG to annunciate the change back to magnetic
reference when leaving the polar region. If the heading reference is TRU in the
descent phase, the ND and PFD display an amber box around the word TRU.
Note: When operating the autopilot in the polar region in other than LNAV, the
TRUE position on the heading reference switch must be selected.
　
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