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AUTO FLIGHT
Sec. 6.4 Page 8 737
Rev. 11/15/02 #41 Continental Flight Manual
Roll Modes
· LNAV – The AFDS intercepts and tracks the active FMC route. Either of
the following capture criteria must be met:
· On any heading and within 3 NM of the active route segment
· If outside of 3 NM of active route segment, aircraft must be on an
intercept course of 90 degrees or less and intercept the route segment
before the active waypoint.
· HDG SEL – The aircraft is turning to, or is on the heading selected in the
MCP Heading Display
· VOR/LOC (armed) – AFDS is armed to capture selected VOR or LOC
COURSE
· VOR/LOC (engaged) – AFDS tracks selected VOR course or tracks
selected localizer course along the inbound front course bearing.
AUTO FLIGHT
737 Sec. 6.4 Page 9
Flight Manual Continental Rev. 11/15/02 #41
Autopilot Control Wheel Steering
Paddle In CWS Or CWS Engage Switch Selected
Placing an engage paddle to CWS or pushing a CWS engage switch engages the
A/P pitch and roll axes in the CWS mode and displays CWS P and CWS R on the
FMAs.
With CWS engaged, the A/P maneuvers the aircraft in response to control
pressures applied by either pilot. The control pressure is similar to that required
for manual flight. When control pressure is released, the A/P holds existing
attitude.
If aileron pressure is released with 6 degrees or less bank, the A/P rolls the
wings level and holds existing heading. This heading hold feature with bank
less than 6 degrees is inhibited when any of the following conditions exists:
· Below 1,500 feet RA with the landing gear down
· After F/D VOR capture with TAS 250 knots or less
· After F/D LOC capture in the APP mode.
Pitch CWS With CMD Selected
The pitch axis engages in CWS while the roll axis is in CMD when:
· A command pitch mode has not been selected or was deselected
· A/P pitch has been manually overridden with control column force. The
force required for override is greater than normal CWS control column
force. This manual pitch override is inhibited in the APP mode with both
A/Ps engaged.
CWS P is annunciated on the FMAs while this mode is engaged. Command pitch
modes can then be selected.
When approaching a selected altitude in CWS P with a CMD engage switch
selected, CWS P changes to ALT ACQ. When at the selected altitude, ALT HOLD
engages.
If pitch is manually overridden while in ALT HOLD at the selected altitude, ALT
HOLD changes to CWS P. If control force is released within 250 feet of the
selected altitude, CWS P changes to ALT ACQ, the aircraft returns to the selected
altitude, and ALT HOLD engages. If the elevator force is held until more than 250
feet from the selected altitude, pitch remains in CWS P.
AUTO FLIGHT
Sec. 6.4 Page 10 737
Rev. 11/15/02 #41 Continental Flight Manual
Roll CWS With CMD Selected
The roll axis engages in CWS while the pitch axis is in CMD when:
· A command roll mode has not been selected or was deselected
· A/P roll has been manually overridden with control wheel force. The force
required for override is greater than the normal CWS control wheel force.
CWS R is annunciated on the FMAs while this mode is engaged.
CWS R with a CMD engage switch illuminated can be used to capture a selected
radio course while the VOR/LOC or APP mode is armed. Upon intercepting the
radial or localizer, the F/D and A/P annunciations change from CWS R to VOR/LOC
engaged, and the A/P tracks the selected course.
AUTO FLIGHT
737 Sec. 6.4 Page 11
Flight Manual Continental Rev. 11/15/02 #41
Autothrottle System
The A/T system provides automatic thrust control from the start of takeoff
through climb, cruise, descent, approach and go-around or landing. In normal
operation, the FMC provides the A/T system with N1 limit values.
The A/T moves the thrust levers with a separate servo motor on each thrust
lever. Manually positioning the thrust levers does not cause A/T disengagement
unless 10 degrees of thrust lever separation is exceeded during a dual channel
approach after FLARE armed is annunciated. Following manual positioning, the
A/T may reposition the thrust levers to comply with computed thrust
requirements except while in the THR HLD and ARM modes.
BCD The A/T system operates properly with the EECs ON or in ALTN. In
either case, the A/T uses the FMC N1 limits. During A/T operation, it is
recommended that both EECs be ON or both be in ALTN, as this produces
minimum thrust lever separation.
A/T Engagement
Moving the A/T Arm switch to ARM, arms the A/T for engagement in the N1, MCP
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737 FLIGHT MANUAL 737飞行手册3(71)
