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• 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
LNAV deactivated:
• by selecting heading hold (HDG HOLD)
• by selecting heading select (HDG SEL)
• when localizer captures
• with dual FMC failure
LNAV is disarmed by pushing LNAV switch a second time.
2 LNAV Light
Illuminated – LNAV roll mode armed or active.
3 Vertical Navigation (VNAV) Switch
Push –
• arms, selects, or disarms VNAV as pitch mode
• displays VNAV in white (armed) on both PFD pitch flight mode
annunciations below 400 feet
• VNAV activates 400 feet above runway elevation
• when VNAV selected and FMC has insufficient data to provide VNAV
guidance (such as invalid gross weight or there is no end–of–descent point
in descent) displays PERF/VNAV NOT AVAILABLE in CDU scratchpad
• VNAV SPD, VNAV PTH, or VNAV ALT pitch mode displays in green
(active) on PFD pitch flight mode annunciator
• in VNAV SPD pitch mode, AFDS commands pitch to hold target
airspeed. The A/T operates in THR REF, THR, IDLE or HOLD mode, as
required by phase of flight
• in VNAV PTH pitch mode, AFDS commands pitch to maintain FMC
target altitude or VNAV path; A/T operates is speed (SPD) mode
April 01, 2001
747 Operations Manual
Automatic Flight -
Controls and Indicators
Copyright © The Boeing Company. See title page for details.
D6-30151-425 4.10.7
• in VNAV ALT pitch mode, AFDS commands pitch to maintain MCP
selected altitude; A/T operates in SPD mode
• VNAV pitch guidance available with one or two engines inoperative
Note: In VNAV, if a conflict exists between the VNAV profile and the MCP
altitude, the airplane levels and the pitch flight mode annunciation
becomes VNAV ALT. Selecting another pitch mode, resetting the MCP
altitude window and pushing the altitude selector, or intercepting the
VNAV path continues the climb or descent.
VNAV deactivated:
• by selecting TO/GA, FLCH SPD, V/S, ALT, or G/S pitch mode
• with a dual FMC failure
VNAV is disarmed by pushing VNAV switch a second time.
4 VNAV Light
Illuminated – VNAV pitch mode armed or active.
5 Flight Level Change (FLCH) Switch
Push –
• selects FLCH SPD pitch mode
• FLCH SPD pitch mode displays in green (active) on PFD flight mode
annunciator
• when IAS/MACH window blank, IAS/MACH window opens to FMC
target speed, if valid. If not valid, IAS/MACH window opens to current
speed
• when IAS/MACH window open, displays command speed
• when changing from TO/GA to FLCH, IAS/MACH window displays
highest value of current airspeed or selected speed
• AFDS pitch holds selected speed. When selected altitude captured, pitch
flight mode annunciator changes to ALT
• A/T annunciates THR, followed by HOLD mode in descent. When
selected altitude captured, A/T mode changes to SPD. A/T advances or
retards thrust levers to maintain a vertical speed proportional to the
altitude change requested
• with higher altitude set in the ALT window, reference thrust limit changes
to CLB when CRZ displayed and to CON with an engine inoperative
6 Flight Level Change Light
Illuminated – flight level change pitch mode active.
April 01, 2001
747 Operations Manual
Copyright © The Boeing Company. See title page for details.
4.10.8 D6-30151-425
Automatic Flight -
Controls and Indicators
Autopilot Flight Director Heading and Bank Angle Controls
1 Heading Window
Displays selected heading.
Displays selected heading on PFDs and NDs.
HDG window, PFD, and ND headings set to 000 when power first applied.
Changes to ILS front course at LOC capture.
2 Heading Select (HDG SEL) Switch
Push -
• selects HDG SEL roll mode
• HDG SEL roll mode displays in green (active) on PFD roll flight mode
annunciation
• AFDS controls roll to acquire and hold selected heading
• bank is limited by bank limit selector
3 Heading (HDG) Selector (inner)
Rotate – sets heading in HDG window and selected heading on PFDs and NDs.
4 BANK LIMIT Selector (outer)
Rotate – sets AFDS commanded bank limit when in heading select (HDG SEL)
roll mode as follows:
• AUTO – varies between 15 – 25 degrees, dependingon TAS, flap
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波音747-441操作手册1(93)
