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SPD or FMC SPD mode. The A/T Arm switch is magnetically held at ARM and
releases to OFF when the A/T becomes disengaged.
A general summary of A/T mode engagement is as follows:
· A/T SPD or N1 modes automatically engage when AFDS command pitch
modes become engaged
· Engaging LVL CHG or VNAV climb modes automatically engages the A/T N1
mode
· Engaging LVL CHG or VNAV descent modes automatically engages the A/T in
RETARD and then ARM when thrust is at idle
· If not in a VNAV mode, engagement of ALT ACQ or ALT HOLD automatically
engages the A/T in the MCP SPD mode; otherwise the A/T remains in FMC
SPD
· Engagement of G/S capture automatically engages the A/T in the MCP SPD
mode.
AUTO FLIGHT
Sec. 6.4 Page 12 737
Rev. 11/15/02 #41 Continental Flight Manual
Autothrottle Disengagement
Any of the following conditions or actions disengages the A/T:
· Moving the A/T Arm switch to OFF
· Pushing either A/T Disengage switch
· An A/T system fault is detected
· Two seconds have elapsed since landing touchdown
· Thrust levers become separated more than 10 degrees during a dual
channel approach after FLARE armed is annunciated
· Significant thrust difference along with control wheel roll input of 10
degrees or more, and flap position up through 10.
A/T disengagement is followed by A/T Arm switch releasing to OFF and
flashing red A/T Disengage lights. The A/T Disengage lights do not illuminate
when the A/T automatically disengages after landing touchdown.
AUTO FLIGHT
737 Sec. 6.4 Page 13
Flight Manual Continental Rev. 11/15/02 #41
Automatic Flight Operations
The phases of flight for automatic flight operations are:
· Takeoff and climb
· Enroute
· Approach and landing
· 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 pushing the TO/GA switch on either thrust
lever. The FMAs display FD as the A/P status, TO/GA as the pitch mode, and
blank for the roll mode.
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 64 knots:
· The pitch command is 10 degrees nose down
· The roll command is wings level
· 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,
and blank for the roll mode.
At 64 knots, the F/D pitch commands 15 degrees nose up.
>@BCD At 84 knots, the A/T mode annunciates THR HLD.
AUTO FLIGHT
Sec. 6.4 Page 14 737
Rev. 11/15/02 #41 Continental Flight Manual
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
· If an engine failure occurs during takeoff, the pitch command target speed
is:
· V2, if airspeed is below V2
· Existing speed, if airspeed is between V2 and V2 + 20
· V2 + 20, if airspeed is above V2 + 20
· The roll command maintains wings level.
After lift–off:
· The A/T remains in THR HLD until 400 feet RA and 18 seconds after lift-off
or 800 feet RA as installed. A/T annunciation then changes from THR HLD
to ARM and reduction to climb thrust can be made by pushing the N1 switch
· Automatic reduction to climb thrust occurs upon reaching the selected
thrust reduction altitude which is shown on the FMC CDU TAKEOFF REF
page 2/2 during preflight, or when the aircraft levels off in ALT HOLD or VNAV
PTH. Pilot entries can be made to override the default value. Allowable
entries are 800 feet to 9999 feet
· Flight director engaged status is terminated by engaging an autopilot in CMD
(CMD replaces FD in A/P status display)
· Pitch engages in LVL CHG and pitch mode FMA is MCP SPD unless
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737 FLIGHT MANUAL 737飞行手册3(72)
