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• A/T operates when speed switch pushed and pitch mode isALT, V/S, or
G/S
• when A/T flight mode annunciation blank and pitch mode is VNAV XXX
or FLCH SPD, cycling the A/T ARMswitch to OFF and back to ARM
operates the A/T
OFF –
• disconnects A/T
• disables A/T activation
• disables engine trim equalization
2 Thrust (THR) Switch
Operative from 400 feet after takeoff until landing.
Push –
Light extinguished (thrust limit function) -
• after takeoff and during climb, changes reference thrust limit to armed
climb thrust limit
• changes reference thrust limit to CLB, unless engine inoperative or CON
selected, then reference thrust limit is CON
Note: Reference thrust limit remains GA when flaps in landing position or pitch
mode is G/S.
Light illuminated (A/T mode function) - Changes A/T mode to THR REF when:
• reference thrust limit is CLB, CLB1, CLB2, CRZ, or CON and pitch
mode is ALT or V/S
• reference thrust limit is GA and pitch mode is G/S or FLARE, or pitch
mode is ALT or V/S and flaps in landing position
3 Speed (SPD) Switch
Operative from 400 feet after takeoff until landing.
Push (light illuminates) –
• selects A/T SPD mode
• displays SPD on both PFDs
• A/T controls thrust to maintain IAS or Mach displayed in IAS/MACH
window subject to minimum and maximum speed limits
• inactive in VNAV XXX, FLCH SPD, or TO/GA pitch modes
April 1, 2000
747 Operations Manual
Copyright © The Boeing Company. See title page for details.
4.10.4 D6-30151-425
Automatic Flight -
Controls and Indicators
Autopilot Flight Director IAS/Mach Controls
1 IAS/MACHWindow
Displays selected speed when IAS/MACH selector controls command speed.
Blank when FMC controls command speed.
IAS/Mach window and PFD speeds set to 200 knots when power first applied.
Display range:
• 100 - 399 KIAS
• .400 - .950 Mach, three digit Mach displayed
Displays selected speed on PFD.
In climb, changes from IAS to Mach at approximtely .840 Mach.
In descent, changes from Mach to IAS at approximately 310 knots.
2 IAS/MACH Select (SEL) Switch
Push –
• alternately changes the IAS/MACH window between IAS and Mach
displays (Mach must be 0.4 or greater to switch from IAS to Mach)
• inoperative when the IAS/MACH window is blank
3 IAS/MACH Selector
Rotate –
• sets speed in IAS/MACH window and command speed on both PFDs
• inoperative when IAS/MACH window blank
2 5 0
IAS/MACH
SEL
Mode Control Panel (MCP)
1
2
3
December 01, 1999
747 Operations Manual
Automatic Flight -
Controls and Indicators
Copyright © The Boeing Company. See title page for details.
D6-30151-425 4.10.5
Push – with VNAV active, alternately opens or closes the IAS/MACH window:
• when window closed, FMC computed target speed is active and displays
on PFDs
• when window open, FMC speed–intervention is active and IAS/MACH
selector may be used to set command speed. Pitch mode annunciator
changes to VNAV SPD when descending inVNAV PTH. Selected speed
maintained by pitch until airplane intercepts an altitude constraint and
VNAV PTH annunciates. When on approach, pitch mode remains VNAV
PTH and A/T controls speed
IAS/MACH window open if pitch mode is FLCH SPD, V/S , TO/GA, ALT, or
G/S.
Autopilot Flight Director Roll and Pitch Controls
1 Lateral Navigation (LNAV) Switch
Push –
• arms, selects, or disarms LNAV as roll mode
• displays LNAV in white (armed) on both PFD roll flight mode
annunciations when armed. The previous roll mode remains active
• LNAV activates when the airplane is 50 feet above runway elevation and:
• within 2.5 NM of the active leg
• when not within 2.5 NM of the active leg but on an intercept heading
to the active leg, remains armed then activates when approaching the
active leg
• when active, displays LNAV in green on PFD roll flight mode
annunciator
Mode Control Panel (MCP)
2 5 0
IAS/MACH
SEL V NAV
L NAV
FL CH
4
5
6
1
3
2
April 01, 2001
747 Operations Manual
Copyright © The Boeing Company. See title page for details.
4.10.6 D6-30151-425
Automatic Flight -
Controls and Indicators
• selection of LNAV with the airplane not on a heading to intercept the
active leg, displays NOT ON INTERCEPT HEADING in the CDU
scratch pad
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