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FMC autotuning. Deletion of a manual–tuned frequency returns system to
autotuning.
Valid entries:
• VOR or non–ILS DME identifiers (XXX) or VOR or non-ILS DME
frequencies (YYY.Y or YYY.YY)
• VOR identifier/course (XXX/ZZZ) or frequency/course (YYY.Y/ZZZ or
YYY.YY/ZZZ); the course displays on the CRS line.
The identifier and frequencies are green and tuning status is white.
Note: When magnetic variation at the airplane and VOR locations are
significantly different, the ND VOR radial and ND POS green radial do not
point directly to the VOR. This difference decreases as the airplane
approaches the VOR.
Blank when in autotune.
Valid entry is a three–digit course. Data can be entered when dashes or a course
are displayed.
With a VOR approach selected, sequencing an IAF/FAF causes the FMC to
procedure autotune the VOR frequency. When the approach has a runway
waypoint, the FMC selects the inbound course.
VOR course is green. Radial is white.
Displays radial from left and right VOR stations to the airplane.
ADF
2 CRS
3 RADIAL
w8mt-34-00-0051
A D F L
B F O
A D F R
1304.5 ----.-
NAV RADIO
1
787 Flight Crew Operations Manual
Flight Management, Navigation -
FMC Preflight
Boeing Proprietary 11.40.29
The tuning status displays adjacent to the left and right ADF frequencies. The
tuning status displays are:
• ANT (antenna) – mode optimizes audio reception and removes ADF
bearing data
• BFO (beat frequency oscillator) – mode for audio identification of
stations transmitting unmodulated (CW) signals
Default tuning mode is ADF (no indication) giving both bearing data and audio.
Valid entries are XXX.X or XXXX.X.
Manual entry can be followed by A (ANT), B (BFO), or none, which defaults to
the ADF mode.
Frequency is cyan and status is white.
ILS-GLS
The tuning status displays adjacent to the ILS frequency/course or GPS channel.
The ILS and GPS receivers operate in FMC autotune or manual tuning modes. The
FMC autotunes the ILS frequency/course or the GPS channel depending upon the
approach selected in the flight plan. When the ILS or GPS is not necessary, the
FMC sets the ILS-GPS status to PARK. This removes the displays from the PFD.
Airplane position on the route determines the ILS-GPS operating mode. The
operating mode displays are:
• PARK – the ILS or GLS is not being used and is not tuned
• XXX.XX/YYY PARK – the ILS is tuned for the selected approach but is
not being used
• “A” indicates autotuning under FMC control for approach guidance
• “M” indicates the ILS or GLS is manually tuned.
1 ADF Frequency and Tune Status
1 ILS-GLS Tuning
w8mt-34-00-0050
P R E S E L E C T
I R S G L S
<1 1 0 . 9 / 1 2 8
NAV RADIO
PARK
-
------ ------
1
2
787 Flight Crew Operations Manual
Flight Management, Navigation -
FMC Preflight
11.40.30 Boeing Proprietary
ILS autotuning is inhibited for ten minutes after takeoff and during
manual–tuning. Autotuning and manual–tuning are inhibited when:
• the autopilot is engaged and either the localizer or glideslope is captured
• only the flight director is ON and either the localizer or glideslope is
captured and the airplane is below 500 feet radio altitude
• on the ground with the localizer alive, the airplane heading within 45
degrees of the localizer front course and the ground speed is greater than
40 knots.
Subsequent manual–tuning is enabled when:
• either TOGA switch is pushed
• the autopilot is disengaged and both flight directors are switched off
• the MCP approach switch is deselected when the airplane is above 1500
feet radio altitude.
Valid entries:
• ILS frequency and front course (XXX.XX/YYY)
• front course, with a frequency already entered (/YYY)
• GPS channel (XXXXX) in the range of 20000 to 99999.
Any valid page data may be entered.
Put data into this line for later use. Data can be moved to the appropriate line when
necessary.
ILS-GLS Tuning Status
The display initializes to PARK. When PARK displayed, the ILS or GLS is not
tuned. The tuning status displays are:
• XXX.XX/YYY PARK – the ILS is autotuned for the selected approach
but is not being used
• XXXXX PARK – the GLS is autotuned for the selected approach but is
not being used
• A (autotune) – ILS or GLS is autotuned for approach guidance
• M (manual) – ILS or GLS is manual tuned.
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787机组操作手册Flight Crew Operations Manual 3(50)
