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IDLE mode is followed by HOLD mode.
• HOLD – The thrust lever autothrottle servos are inhibited. The pilot can
set the thrust levers manually.
• SPD – The autothrottle maintains the selected speed displayed on the PFD
and HUD. Speed can be set by the MCP IAS/MACH selector or by the
FMC, as shown on the CDU CLIMB, CRUISE, or DESCENT page. The
autothrottle will not exceed the operating speed limits or the thrust limits
displayed on the EICAS.
787 Flight Crew Operations Manual
Automatic Flight -
System Description
4.20.6 Boeing Proprietary
Roll Modes
The roll modes are:
LNAV –
• LNAV (armed) – LNAV is armed to engage when parameters are met.
• LNAV (engaged) – LNAV engages if above 50 feet, and within 2 1/2 NM
of the active route leg. The AFDS follows the active leg displayed on the
ND.
• On go-around, LNAV engages 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.
HDG –
• HDG SEL (engaged) – The airplane is turning to, or is on the heading
selected in the MCP heading/track window.
• HDG HOLD (engaged) – The AFDS holds the present heading. If
turning, the AFDS holds the heading reached after rolling wings level.
TRK –
• TRK SEL (engaged) – The airplane is turning to, or is on the track
selected in the MCP heading/track window.
• TRK HOLD (engaged) – The AFDS holds the present track. If turning,
the AFDS holds the track reached after rolling wings level.
ATT – (engaged) – When the autopilot is first engaged or the flight director is first
turned on in flight, the AFDS holds a bank angle between 5 and 30 degrees and
will not roll to wings level. If the bank angle is less than 5 degrees, the AFDS
returns to wings level (HDG HOLD or TRK HOLD). If the bank angle is greater
than 30 degrees, the AFDS returns to 30 degrees of bank
LOC –
• LOC (armed) – The AFDS captures the localizer when within range and
within 120 degrees of the localizer track.
• LOC (engaged) – The AFDS follows the selected localizer course.
FAC –
• FAC (armed) – The AFDS captures the IAN final approach course.
• FAC (engaged) – The AFDS tracks the IAN final approach course along
the inbound bearing.
B/CRS –
• B/CRS (armed) – The AFDS captures the localizer final approach back
course.
• B/CRS (engaged) – The AFDS tracks the localizer final approach course
along the inbound back course bearing.
787 Flight Crew Operations Manual
Automatic Flight -
System Description
Boeing Proprietary 4.20.7
TO/GA –
• On the ground, TO/GA annunciates by positioning either flight director
switch ON when both flight directors are OFF, or by pushing either
TO/GA switch with airspeed greater than 80 KTS. TO/GA roll guidance
becomes active at lift–off.
• In flight, TO/GA is armed with the flaps not retracted or at glideslope
capture. There is no flight mode annunciation for TO/GA armed in flight.
TO/GA is engaged in flight by pushing a TO/GA switch. The AFDS
maintains the ground track present at mode engagement.
HUD TO/GA (Low Visibility Takeoff Option)–
• On takeoff, HUD provides lateral guidance for takeoff roll and rejected
takeoff using ILS or GLS signals. Selecting a HUD TAKEOFF departure
in the FMC and turning either flight director on sets HUD TO/GA as the
engaged roll mode on the PFD and HUD.
• HUD guidance becomes active and cue appears when the airplane
approaches the runway center line and airplane heading is within 45 deg
of runway heading.
Note: The lateral flight director bar on the PFD also moves with the guidance
commands but is not certified for use during a low visibility takeoff.
• During takeoff, the HUD symbology automatically changes to full mode
symbology and the HUD symbology control switch is inhibited.
ROLLOUT –
• ROLLOUT (armed) – Displayed below 1500 feet radio altitude and
engages below 2 feet.
• ROLLOUT (engaged) – After touchdown, the AFDS uses rudder and
nosewheel steering to keep the airplane on the localizer centerline.
Pitch Modes
The pitch modes are:
TO/GA –
On the ground, TO/GA annunciates by positioning either flight director switch
ON when both flight directors are OFF, or by pushing either TO/GA switch with
　
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本文鏈接地址：787機(jī)組操作手冊(cè)Flight Crew Operations Manual 2(4)