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Tuning status displays adjacent to left and right ADF frequencies. Tuning status
displays are:
• ANT (antenna) - mode for bearing data
• BFO (beat frequency oscillator) - mode for audio data used during manual
tuning
• none - default tuning mode gives both bearing data and audio
Valid entries are XXX.X or XXXX.X
Entry can be followed by A (ANT), B (BFO), or none, which defaults to the ADF
mode. A or B can be entered with a frequency already displayed.
4 ILS Frequency and Course
Tuning status displays adjacent to ILS frequency and course. The ILS receivers
operate in FMC autotune or manual-tuning modes. The FMC autotunes ILS
frequency and course. When the ILS is not necessary, the FMC sets the ILS to
PARK. This removes the displays from the PFD.
December 01, 1999
747 Operations Manual
Copyright © The Boeing Company. See title page for details.
11.40.24 D6-30151-425
Flight Management, Navigation -
FMC Preflight
ILS autotuning is inhibited for tenminutes after takeoff and duringmanual-tuning.
The ten minute inhibit is canceled when making a change to the active flight plan
destination runway. 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, airplane heading within 45 degrees
of the localizer front course, and ground speed greater than 40 knots
Manual ILS tuning is enabled when:
• pushing either TOGA switch
• disengaging the autopilot and switching off both flight directors.
Valid entries:
• ILS frequency and front course (XXX.XX/YYY)
• front course, with a frequency and course already entered (/YYY)
5 PRESELECT
Any valid page data may be entered.
6 RADIAL
Displays radial from left and right VOR stations to the airplane.
December 01, 1999
747 Operations Manual
Flight Management, Navigation -
FMC Preflight
Copyright © The Boeing Company. See title page for details.
D6-30151-425 11.40.25
ILS Tuning Status
Display initializes to PARK. Tuning status displays are:
• XXX.XX/YYY PARK – ILS autotuned for selected approach but not
being used
• A (autotune) - ILS autotuned for approach guidance
• M (manual) - ILS manual-tuned
1 Park
PARK displays when:
• electrical power is first applied
• more than 200 NM from the T/D, or
• less than halfway to the destination
2 Tuning Status – Frequency, Course, and Park
ILS frequency, front course, and PARK display when an ILS, LOC, Back Course;
or a VOR, runway, or VFR approach to an ILS/LOC equipped runway is selected,
and:
• less than 200 NM from the T/D, or
• more than halfway to the destination
Line selection manually tunes ILS–MLS.
1
2
PARK
-- - - --
I L S
1 3 0 4 . 5 B F O
- ML S
1 3 0 4 . 5 B F O -- - - --
< 1 1 0 . 9 0 / 1 3 0 PARK
I L S - ML S
1 3 0 4 . 5 B F O -- - - --
1 1 0 . 9 / 1 30 A
I L S - ML S
3 0
1 3 0 4 . 5 B F O -- - - --
1 1 0 . 9 / 1 30 M
I L S - ML S
4 0
December 01, 1999
747 Operations Manual
Copyright © The Boeing Company. See title page for details.
11.40.26 D6-30151-425
Flight Management, Navigation -
FMC Preflight
3 Tuning Status – Autotune
ILS frequency, front course, and A display when an ILS, LOC, Back Course; or a
VOR, runway, or VFR approach to an ILS/LOC equipped runway is selected, and:
• less than 50 NM from the T/D, or
• less than 150 NM from the runway threshold, or
• FMC is in descent mode
4 Tuning Status– Manual
Receiver tuned manually and valid frequency/course display.
Preflight Pages – Part 2A
Performance Initialization Page
The performance initialization page allows entry of airplane and route data to
initialize performance calculations. This data is required for VNAV calculations.
Entered values clear with loss of electrical power or at engine shutdown after
flight.
December 01, 1999
747 Operations Manual
Flight Management, Navigation -
FMC Preflight
Copyright © The Boeing Company. See title page for details.
D6-30151-425 11.40.27
1 Gross Weight (GR WT)
Airplane gross weight can be entered by the flight crew or calculated by the FMC
after entry of zero fuel weight.
Valid entries are XXX or XXX.X.
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