737-300机组操作手册Flight Crew Operations Manual FCOM 2(33)_航空信息_民用航空_通用航空

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if an engine failure occurs during takeoff, the pitch command target speed
is:

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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 (annunciation blank) or, on some
airplanes, selected heading (annunciation HDG SEL).

After lift-off:
.
the A/T remains in THR HLD until 400 feet RA is reached and
approximately 18 seconds have elapsed since liftoff. A/T annunciation
then changes from THR HLD to ARM and reduction to climb thrust can
be made by pressing the N1 switch.

.
automatic thrust reduction to climb power occurs when VNAV, ALT ACQ
or ALT HOLD is engaged. Until 2 1/2 minutes after liftoff, automatic
thrust reduction is inhibited when engaging LVL CHG or V/S modes.

Automatic Flight -System Description 737 Operations Manual
. on some airplanes, automatic reduction to climb thrust occurs upon
reaching the selected thrust reduction altitude which is shown on the FMC
CDU N1 LIMIT page during preflight, or when the airplane levels off in
ALT HOLD or VNAV PTH. Pilot entries can be made to override the
default value. Allowable entries are 400 feet above the origin airport to
15,000 feet MSL.

.
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

.
MCP IAS/Mach display and airspeed cursor change to V2 + 20 knots

.
roll mode maintains HDG SEL unless previously changed to LNAV or VOR/LOC.

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.
Automatic Flight -System Description

Automatic Flight Takeoff Profile

airplanes w/Heading Select roll command (blank for Wings Level)
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 -System Description 737 Operations Manual
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 prior to the Final Approach Fix 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 glide slope.
Approach (APP) Mode Dual Autopilots
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 airplane 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.
Localizer and Glide Slope Armed
After setting the localizer frequency and course, pressing 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. On some airplanes, glide slope capture cannot occur 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, on some airplanes 1 CH is annunciated for A/P status, the previous roll mode disengages and the airplane turns to track the LOC.
　
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