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another pitch mode has been selected
· MCP IAS/Mach display and airspeed cursor change to V2 + 20 knots
· Roll mode engages in HDG SEL unless another roll mode has been
selected.
To terminate the takeoff mode below 400 feet RA, both F/D switches must be
turned OFF. Above 400 feet RA, selection of another pitch mode or engaging an
autopilot will terminate the takeoff mode; other F/D roll modes can be also
selected.
AUTO FLIGHT
737 Sec. 6.4 Page 15
Flight Manual Continental Rev. 11/15/02 #41
AUTOMATIC FLIGHT TAKEOFF PROFILE
AUTO FLIGHT
Sec. 6.4 Page 16 737
Rev. 11/15/02 #41 Continental Flight Manual
Automatic Flight En Route
The autopilot and/or the flight director can be used after takeoff to fly a lateral
navigation track (LNAV) and a vertical navigation track (VNAV) provided by
the FMC.
Other roll modes available are:
· VOR course (VOR/LOC)
· Heading select (HDG SEL).
Other pitch modes available are:
· Altitude hold (ALT HOLD)
· Level change (MCP SPD)
· Vertical speed (V/S).
Automatic Flight Approach And Landing
The AFDS provides guidance for single A/P non-precision approaches. The
VOR/LOC switch arms the AFDS for VOR or localizer tracking. Descent may be
accomplished using VNAV, LVL CHG, or V/S. VOR/LOC, LNAV, or HDG SEL may be
used for the roll mode.
The AFDS provides guidance for single or dual A/P precision approaches. The
approach mode arms the AFDS to capture and track the localizer and
glideslope.
Approach (APP) Mode Dual A/Ps
Approach mode allows both A/Ps to be engaged at the same time. Dual A/P
operation provides fail passive operation through landing flare and touchdown
or an automatic go-around. During fail passive operation, the flight controls
respond to the A/P commanding the lesser control movement. If a failure
occurs in one A/P, the failed channel is counteracted by the second channel such
that both A/Ps disconnect with minimal aircraft maneuvering and with aural and
visual warnings to the pilot.
One VHF NAV receiver must be tuned to an ILS frequency before the approach
mode can be selected. For a dual A/P approach, the second VHF NAV receiver
must be tuned to the ILS frequency and the corresponding A/P engaged in CMD
prior to 800 feet RA.
AUTO FLIGHT
737 Sec. 6.4 Page 17
Flight Manual Continental Rev. 11/15/02 #41
Localizer And Glideslope Armed
After setting the localizer frequency and course, pushing the APP switch selects
the APP mode. The APP switch illuminates and VOR/LOC and G/S annunciate
armed. The APP mode permits selecting the second A/P to engage in CMD. This
arms the second A/P for automatic engagement after LOC and G/S capture and
when descent below 1500 RA occurs.
The localizer can be intercepted in the HDG SEL, CWS R or LNAV mode.
Glideslope (G/S) capture is inhibited prior to localizer capture.
Localizer Capture
The LOC capture point is variable and depends on intercept angle and rate of
closure, but does not occur at less than 1/2 dot. Upon LOC capture, VOR/LOC
annunciates captured, 1 CH is annunciated for A/P status, the previous roll mode
disengages and the aircraft turns to track the LOC.
Glideslope Capture
Glideslope capture is inhibited prior to localizer capture.
The G/S can be captured from above or below. Capture occurs at 2/5 dot and
results in the following:
· G/S annunciates captured
· Previous pitch mode disengages
· APP light extinguishes if localizer has also been captured
· Aircraft pitch tracks the G/S
· GA displayed on thrust mode display (N1 thrust limit).
After VOR/LOC and G/S are both captured, the APP mode can be exited by:
· Pushing a TO/GA switch
· Disengaging A/P and turning off both F/D switches
· Retuning a VHF NAV receiver.
AUTO FLIGHT
Sec. 6.4 Page 18 737
Rev. 11/15/02 #41 Continental Flight Manual
After LOC And G/S Capture
Shortly after capturing both LOC and G/S and below 1500 feet RA:
· The second A/P couples with the flight controls
· Test of the ILS deviation monitor system is performed and the G/S and LOC
displays turn amber and flash
· FLARE armed is annunciated
· The 1 CH annunciation extinguishes
· A/P go-around mode arms but is not annunciated.
The A/Ps disengage and the F/D command bars retract to indicate an invalid
ILS signal.
800 Feet Radio Altitude
The second A/P must be engaged in CMD by 800 feet RA to execute a dual
channel A/P approach. Otherwise, CMD engagement of the second A/P is
　
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