Automatic Flight -System Description 737 Operations Manual
Acquisition Alerting Standard Configuration
When approaching within 900 feet of selected altitude both ALTITUDE ALERT lights illuminate steady, and a momentary tone sounds. When at 300 feet from selected altitude, both ALTITUDE ALERT lights extinguish.
Alternative Configuration
When approaching within 750 feet of selected altitude both ALTITUDE ALERT lights illuminate steady. When at 250 feet from selected altitude, both ALTITUDE ALERT lights extinguish.
Deviation Alerting Standard Configuration
Upon deviating from the selected altitude by more than 300 feet, a momentary tone sounds, and the ALTITUDE ALERT lights flash. Flashing continues until one of the following occurs:
.
Altitude deviation becomes less than 300 feet.
.
Altitude deviation becomes more than 900 feet.
.
A new altitude is selected.
Alternative Configuration
Upon deviating from the selected altitude by more than 250 feet, a momentary tone sounds, and the ALTITUDE ALERT lights flash. Flashing continues until one of the following occurs:
.
Altitude deviation becomes less than 250 feet.
.
Altitude deviation becomes more than 750 feet.
.
A new altitude is selected.
Automatic Flight -System Description
Altitude Alert
NO INDICATIONS
Acquisition: Aural warning tone momentarily sounds and both
lights illuminate steady.
Deviation: Aural warning tone momentarily sounds and both
ALT ALERT
ALT ALERT lights flash.
Standard Configuration
Copyright . The Boeing Company. See title page for details.
4.20.10 December 1, 2000
Automatic Flight -System Description 737 Operations Manual
NO INDICATIONS
Acquisition: Aural warning tone momentarily sounds and both
ALT ALERT
lights illuminate steady.
Deviation: Aural warning tone momentarily sounds
and both ALT ALERT lights illuminate
steady.
Alternative Configuration
Automatic Flight Operations
The phases of flight for automatic flight operations are:
.
Takeoff and climb . Approach and landing
.
Enroute . Go–around
Automatic Flight Takeoff and Climb
Takeoff is a flight director only function of the TO/GA mode. Flight director pitch and roll commands are displayed, and the autothrottle maintains takeoff N1 thrust limit as selected from the FMC. The autopilot may be engaged after takeoff.
Both F/Ds must be ON to engage the takeoff mode prior to starting the takeoff. The F/D takeoff mode is engaged by pressing the TO/GA switch on either thrust lever. The FMAs display FD as the A/P status, TO/GA as the pitch mode, HDG SEL as the roll mode for airplanes with HDG SEL, and blank as the roll mode for airplanes with wings level.
Automatic Flight -System Description
737 Operations Manual
During takeoff, pushing a TO/GA switch engages the autothrottle in the N1 mode. The A/T annunciation changes from ARM to N1 and thrust levers advance toward takeoff thrust.
The F/D can also be engaged in the takeoff mode with the F/D switches off. If a TO/GA switch is pushed after 80 knots below 2000 feet AGL and prior to 150 seconds after lift–off, the F/D command bars automatically appear for both pilots.
During takeoff, prior to 60 KIAS:
.
the pitch command is 10 degrees nose down
.
the roll command is wings level or heading select.
.
the autothrottle is engaged in the N1 mode
.
thrust levers advance until the engines reach takeoff thrust
.
the FMAs display N1 for the autothrottle mode, TO/GA for the pitch
mode, blank for the roll mode for airplanes which maintain wings level, or
HDG SEL for the roll mode for airplanes which maintain selected
heading.
At 60 knots, the F/D pitch commands 15 degrees nose up.
At 84 knots (64 knots for airplanes with an earlier autothrottle computer), the A/T mode annunciates THR HLD.
At lift–off:
.
the pitch command continues at 15 degrees until sufficient climb rate is
acquired. Pitch then commands MCP speed (normally V2) plus 20 knots.
