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inhibited.
400 Feet Radio Altitude
The stabilizer is automatically trimmed an additional amount nose up. If the
A/Ps subsequently disengage, forward control column force may be required to
hold the desired pitch attitude.
If FLARE is not armed by approximately 350 feet RA, both A/Ps automatically
disengage.
AUTO FLIGHT
737 Sec. 6.4 Page 19
Flight Manual Continental Rev. 11/15/02 #41
Flare
The A/P flare maneuver starts at approximately 50 feet RA and is completed at
touchdown:
· FLARE engaged is annunciated and F/D command bars retract
· The stabilizer is automatically trimmed an additional amount nose up at 50
feet RA.
· The A/T begins retarding thrust at approximately 27 feet RA so as to reach
idle at touchdown. A/T FMA annunciates RETARD.
· The A/T automatically disengages approximately 2 seconds after
touchdown.
· The A/P must be manually disengaged after touchdown. Landing rollout is
executed manually after disengaging the A/P.
Approach (APP) Mode Single A/P
A single A/P ILS approach can be executed by engaging only one A/P in CMD
after pushing the APP mode select switch. Single A/P approach operation is the
same as dual, with the following exceptions:
· Full automatic flare and touchdown capability is not available. FLARE is not
annunciated and stabilizer trim bias is not applied
· A/P status of 1 CH is annunciated for the entire approach after localizer
capture
· An A/P go-around is not available.
AUTO FLIGHT
Sec. 6.4 Page 20 737
Rev. 11/15/02 #41 Continental Flight Manual
INTENTIONALLY LEFT BLANK
AUTO FLIGHT
737 Sec. 6.4 Page 21
Flight Manual Continental Rev. 11/15/02 #41
AUTOMATIC FLIGHT APPROACH PROFILE
AUTO FLIGHT
Sec. 6.4 Page 22 737
Rev. 11/15/02 #41 Continental Flight Manual
Go-Around
Go-Around (GA) mode is engaged by pushing either TO/GA switch. An A/P goaround
requires dual A/P operation and is armed when FLARE armed is
annunciated. If both A/Ps are not operating, a manual F/D go-around is
available.
With the A/T Arm switch at ARM, the A/T go-around mode is armed when
descending below 2000 feet RA, with or without the AFDS engaged. Once
armed, the A/T go-around mode can be engaged until 2 seconds have elapsed
after landing touchdown.
A/P Go-Around
The A/P GA mode requires dual A/P operation and is available after FLARE armed
is annunciated and prior to the A/P sensing touchdown.
With the first push of either TO/GA switch:
· A/T (if armed) engages in GA and the A/T Engaged Mode annunciation on
the FMA indicates GA
· Thrust advances toward the reduced go-around N1 to produce 1000 to
2000 fpm rate of climb
· Pitch mode engages in TO/GA and the Pitch Engaged Mode annunciation on
the FMA indicates TO/GA
· F/D pitch commands 15 degrees nose up until reaching programmed rate of
climb. F/D pitch then commands target airspeed for each flap setting based
on maximum takeoff weight calculations
· F/D roll commands hold current ground track. The Roll Engaged Mode
annunciation on the FMA is blank
· The IAS/Mach display blanks
· The command airspeed cursor automatically moves to a target airspeed for
the existing flap position based on maximum takeoff weight calculations.
If the go-around mode is selected after touchdown and prior to A/T
disengagement, the A/Ps disengage and the A/Ts may command GA thrust.
With the second push of either TO/GA switch after A/T reaches reduced goaround
thrust:
· The A/T advances to the full go-around N1 limit.
AUTO FLIGHT
737 Sec. 6.4 Page 23
Flight Manual Continental Rev. 11/15/02 #41
TO/GA mode termination from A/P go-around:
· Below 400 feet RA, the AFDS remains in the go-around mode unless both
A/Ps and F/Ds are disengaged
· Above 400 feet RA, select a different pitch or roll mode.
· If the roll mode is changed first:
- The selected mode engages in single A/P roll operation and is
controlled by the A/P which was first in CMD
- Pitch remains in dual A/P control in TO/GA mode.
· If the pitch mode is changed first:
- The selected mode engages in single A/P pitch operation and is
controlled by the A/P which was first in CMD
- The second A/P disengages
- The roll mode engages in CWS R.
· The A/T GA mode is terminated when:
- Another pitch mode is selected
- ALT ACQ annunciates engaged.
- The pitch mode cannot be changed from TO/GA until sufficient
nose-down trim has been input to allow single channel A/P
　
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