.
roll
.
pitch.
Engaged or captured modes are shown at the top of the flight mode annunciation boxes in large green letters. Armed modes are shown in smaller white letters at the bottom of the flight mode annunciation boxes.
Autothrottle Modes
.
N1 – the autothrottle maintains thrust at the selected N1 limit displayed
on the thrust mode display, including full go-around N1 limit
.
GA – the autothrottle maintains thrust at reduced go–around setting
.
RETARD – displayed while autothrottle moves thrust levers to the aft
stop. RETARD mode is followed by ARM mode
.
FMC SPD – the autothrottle maintains speed commanded by the FMC.
The autothrottle is limited to the N1 value shown on the thrust mode
display
.
MCP SPD – the autothrottle maintains speed set in the MCP IAS/MACH
display. The autothrottle is limited to the N1 value shown on the thrust
mode display
.
THR HLD – the thrust lever autothrottle servos are inhibited; the pilot can
set the thrust levers manually
.
ARM – no autothrottle mode engaged. The thrust lever autothrottle servos
are inhibited; the pilot can set thrust levers manually. Minimum speed
protection is provided
Copyright . The Boeing Company. See title page for details.
4.20.4 June 1, 2005
Automatic Flight -System Description 737 Flight Crew Operations Manual
Pitch Modes
. TO/GA – Takeoff Engaged for takeoff by turning both F/D switches ON and pushing either
TO/GA switch. Both F/Ds must be ON to engage TO/GA prior to starting
takeoff.
The AFDS commands pitch attitude in the following order:
.
10 degrees nose down until 60 knots IAS
.
15 degrees nose up after 60 knots IAS
.
15 degrees nose up after lift–off until a sufficient climb rate is acquired. Then, pitch is commanded to maintain MCP speed plus 20 knots.
TO/GA can also be engaged for takeoff with F/D switches OFF if a TO/GA switch is pushed after 80 knots IAS below 2000 feet AGL and prior to 150 seconds after lift–off.
. TO/GA – Go–around
Engaged for go–around by pushing the TO/GA switch under the following conditions:
.
inflight below 2000 feet radio altitude
YA613, YA687, YA809, YC154, YD651 - YK104
.
inflight above 2000 feet radio altitude with flaps not up or G/S captured
.
not in takeoff mode
.
either F/D ON or OFF. When engaged, the F/Ds command roll to hold the ground track, and 15 degrees nose up pitch. After reaching a programmed rate of climb,
pitch commands the target airspeed for each flap setting based on maximum takeoff weight calculations.
. VNAV – VNAV is engaged by pushing the VNAV switch. With a VNAV mode
engaged, the FMC commands AFDS pitch and A/T modes to fly the vertical profile.
.
VNAV SPD – the AFDS maintains the FMC speed displayed on the airspeed indicator and/or the CDU CLIMB or DESCENT pages
.
VNAV PTH – the AFDS maintains FMC altitude or descent path with
pitch commands.
YD651 - YD655
.
VNAV ALT – when a conflict occurs between the VNAV profile and the MCP altitude, the airplane levels and the pitch flight mode annunciation becomes VNAV ALT. VNAV ALT maintains altitude.
.
V/S (engaged) – commands pitch to hold selected vertical speed
.
V/S (armed) – V/S mode can be engaged by moving Vertical Speed
thumbwheel
Copyright . The Boeing Company. See title page for details.
Automatic Flight -System Description 737 Flight Crew Operations Manual
.
ALT ACQ – transition maneuver entered automatically from a V/S, LVL
CHG, or VNAV climb or descent to selected MCP altitude. Engages but
does not annunciate during VNAV transition
.
ALT HOLD – commands pitch to hold MCP selected altitude or
uncorrected barometric altitude at which ALT HOLD switch was pushed
.
MCP SPD – pitch commands maintain IAS/MACH window airspeed or
Mach
.
G/S (armed) – the AFDS is armed for G/S capture
.
G/S (engaged) – the AFDS follows the ILS glideslope
.
FLARE (armed) – during a dual A/P ILS approach, FLARE is displayed
after LOC and G/S capture and below 1500 feet RA. The second A/P
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