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lower line of the window. If the upper line was blank/closed, it remains
unchanged. Pushing the data link CNCL button removes the clearance from the
lower line.
For conditional clearances, pushing the ACCEPT button automatically displays
clearance IAS or Mach value in the lower line only after condition contained in
the clearance is met.
Uplinked clearances are preceeded by the letters "UL".
3 IAS/MACH Selector
4 Uplink Transfer (XFR) Switch
5 ATC Uplinked Speed Clearance
787 Flight Crew Operations Manual
Automatic Flight -
Controls and Indicators
4.10.6 Boeing Proprietary
Autopilot Flight Director Roll and Pitch Controls
Push –
• Arms, engages, or disarms LNAV as the roll mode.
• Displays LNAV as armed mode on PFD (in white) and HUD roll flight
mode annunciator. The previous engaged roll mode remains active.
• LNAV engages if the airplane is above 50 feet radio altitude and:
• within 2.5 NM of the active leg
• if not within 2.5 NM of the active leg and on an intercept heading to
the active leg, remains armed then engages when approaching the
active leg
• when engaged, displays LNAV in green on the PFD and HUD roll
flight mode annunciator
• Selection of LNAV with the airplane not on a heading to intercept the
active leg, displays NOT ON INTERCEPT HEADING in the CDU help
window.
• Selection of LNAV when an active FMC route is not available displays
NO ACTIVE ROUTE in the CDU help window.
• LNAV maintains current heading when:
• passing the last active route waypoint
• passing the last waypoint prior to a route discontinuity
• passing the last route offset waypoint
• activating the inactive route or activating an airway intercept and not
within LNAV engagement criteria.
• On go-around when valid missed approach path exists, LNAV mode
engages automatically at 50 feet radio altitude with flight director only or
200 feet radio altitude with the autopilot engaged. LNAV is disengaged by
engaging any other roll mode or by disengaging the autopilot and turning
both flight directors off.
1 Lateral Navigation (LNAV) Switch
MODE CONTROL PANEL (MCP) PRELIMINARY
LNAV
A/T FLCH
CLB/CON
A/P
A/T ARM
L R
OFF
IAS IAS
UL
200
200
A/P DISENGAGE
VNAV
OFF
ON
F/D
MACH
XFR
3
6
5
1
2
4
787 Flight Crew Operations Manual
Automatic Flight -
Controls and Indicators
Boeing Proprietary 4.10.7
LNAV is disengaged:
• by selecting heading hold (HDG HOLD) or track hold (TRK HOLD)
• by selecting heading select (HDG SEL) or track select (TRK SEL)
• when the localizer captures
• if there is a dual FMC failure (LNAV may be re–engaged if there is an
active CDU ALTN NAV route available).
LNAV is disarmed by pushing the LNAV switch a second time, or by arming LOC
or APP.
Illuminated (white) – the LNAV mode is armed or engaged.
Push –
• Arms, engages, or disarms VNAV as the pitch mode.
• Displays VNAV as armed mode on PFD (in white) and HUD pitch flight
mode annunciator below 400 feet.
• VNAV engages 400 feet above runway elevation.
• If VNAV is selected and the FMC has insufficient data to provide VNAV
guidance (such as the gross weight is invalid or there is no
end–of–descent point in descent) displays PERF/VNAV UNAVAILABLE
in the CDU help window.
• VNAV SPD, VNAV PTH or VNAV ALT pitch mode is displayed in green
(engaged) on the PFD and HUD pitch flight mode annunciator.
• In the VNAV SPD pitch mode, the AFDS commands pitch to hold target
airspeed. The autothrottle operates in the THR REF, THR, IDLE or
HOLD mode, as required by the phase of flight.
• In the VNAV PTH pitch mode, the AFDS commands pitch to maintain
FMC target altitude or the VNAV path. The autothrottle maintains speed.
• In the VNAV ALT pitch mode, the AFDS commands pitch to maintain the
MCP selected altitude when that altitude is lower than the VNAV
commanded altitude in climb or higher than the VNAV commanded
altitude in descent.
• If VNAV is selected and VNAV commands a descent with the MCP
altitude window above the current airplane altitude, the autopilot
maintains the altitude at which VNAV was selected. When on an
instrument approach using VNAV, selecting the missed approach altitude
does not interfere with the VNAV descent.
• If VNAV is selected and VNAV commands a climb with the MCP
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787机组操作手册Flight Crew Operations Manual 1(137)
