737 MAX Flight Crew Operations Manual
Automatic Flight -
System Description
4.20.6
MN-FLT-OH-201
AFDS Flight Mode Annunciations
The flight mode annunciations are displayed just above the attitude indicator on
the outboard display unit. The mode annunciations, from left to right, are:
• autothrottle
• 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
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.
March 1, 2021
