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major components of the ADRS are the air data reference units (ADRUs), and air
data modules (ADMs).
Radio Navigation Systems
Automatic Direction Finding (ADF)
Two ADF systems are installed. Either ADF can be manually tuned from the left
or right CDU on the NAV RADIO page.
ISFD
PFD MFD MFD
MFD
PFD
LEFT RIGHT
AFDS
GPS ALTITUDE
AOA AIRSPEED
ATTITUDE
HEADING
POSITION
PRIMARY FLIGHT INSTRUMENTS
GPS
IRS
INERTIAL REFERENCE UNIT
ATTITUDE HEADING REFERENCE UNIT
787 Flight Crew Operations Manual
Flight Management, Navigation -
Navigation Systems Description
Boeing Proprietary 11.20.9
ADF Displays
Left and right ADF bearings display on the ND when the associated ADF
checkbox on the ND pull down menu is selected. ADF data is cyan.
In the unlikely event that all three FMCs fail, or if all of the large displays fail, ND
map displays blank and the ADFs become unusable. Aircrews must revert to
navigation using the alternate navigation (ALTN NAV) function of the TCP.
Distance Measuring Equipment (DME)
Two DME systems are installed. The DMEs are usually tuned by the FMC, but
may be tuned manually.
DME Tuning
DME is tuned manually when the VOR portion of a VOR/DME pair is entered on
the NAV RADIO page. The FMC tunes DME as necessary for radio position
updates. Manual DME tuning does not inhibit FMC DME tuning.
The FMC uses two DMEs for position updates. DME/DME position updates are
usually more accurate than VOR/DME updates. The FMC cannot tune specific
DMEs if the navaids are inhibited on the REF NAV DATA page.
DME Displays
DME distances are displayed on the ND map when VOR L or VOR R are selected
on the ND pull down menu. DME distance also displays on the PFD when the ILS
receivers are tuned to a collocated DME and localizer facility.
POS REF page 2/4 displays the identifiers of the DME stations used for FMC
position updates.
Instrument Landing System (ILS)
Two ILS receivers are installed. They are usually tuned by the FMC, but can be
tuned manually on the NAV RADIO page.
ILS Tuning
Two conditions must be met for FMC ILS autotuning to occur:
• an ILS, LOC, back course, LDA (localizer–type directional aid), or SDF
(simplified directional facility) approach have been selected to the active
route, and
• the airplane is within 50 nm from the top of descent, 150 nm of the
landing runway threshold, or the FMC is in descent mode.
Both ILS receivers can be manually tuned from the NAV RADIO page at anytime
unless ILS approach tuning inhibit is active.
787 Flight Crew Operations Manual
Flight Management, Navigation -
Navigation Systems Description
11.20.10 Boeing Proprietary
ILS approach tuning inhibit is active when:
• the autopilot is engaged and either the localizer or glideslope is captured
• only the flight director is engaged, and either the localizer or the
glideslope is captured, and the airplane is below 500 feet radio altitude, or
• on the ground, the localizer is alive, airplane heading is within 45 degrees
of the localizer front course, and ground speed is greater than 40 knots
ILS tuning is again enabled when:
• either TO/GA switch is pushed
• the autopilot is disengaged and both flight director switches are switched
off, or
• the MCP approach mode is deselected above 1500 feet radio altitude
The ILS frequency is automatically retuned when ILS tuning is enabled and a new
approach is selected on the CDU.
In the unlikely event that all three FMCs fail, or if all of the large displays fail, the
left ILS can be tuned from ALTN NAV RADIO page 2/2 on the TCP.
ILS Displays
The tuned ILS frequency displays on the PFD and on the ND in the approach
mode.
When both ILS receivers are operating, deviations from the left ILS are displayed
on the captain’s PFD, and deviations from the right ILS are displayed on the first
officer’s PFD. If an ILS receiver fails, data from the remaining ILS is displayed
on both the captain's and first officer's displays and the EICAS caution message
SINGLE SOURCE APPROACH is displayed. Localizer and glideslope deviation,
and selected course display on the ND when that ND is in the approach mode.
Front or back course deviation is determined from airplane heading.
Navaid Identifier Decoding
The Morse code identifier of a tuned VOR, ILS, DME, or ADF can be converted
to alpha characters. The decoded identifier then displays on the PFD and ND. The
crew should monitor this identifier for correct navigation radio reception. The
identifier name is not compared with the FMC database.
　
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