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or autopilot engage paddles. A/P engagement in CMD or CWS is inhibited
unless both of the following pilot-controlled conditions are met:
· No force is being applied to the control wheel
· The STAB TRIM AUTOPILOT cutout switch is at NORMAL.
Only one A/P can be engaged at a given time unless the approach (APP) mode is
engaged. Approach mode allows both A/Ps to be engaged at the same time.
Dual A/P operation provides control through landing flare and touchdown or an
automatic go-around.
In single A/P operation, full automatic flare and touchdown capability and A/P
go-around capability are not available.
Autopilot Disengagement
The A/P automatically disengages when any of the following occurs:
· Pushing either A/P disengage switch
· Pushing either Takeoff / Go-around (TO/GA) switch with a single A/P
engaged in CWS or CMD below 2000 feet RA
· Pushing either TO/GA switch after touchdown with both A/Ps engaged in
CMD
· Pushing an illuminated A/P ENGAGE switch
· Activating either pilot’s control wheel trim switch
· Moving the STAB TRIM AUTOPILOT cutout switch to CUTOUT
· Either left or right IRS system failure or FAULT light illuminated
· Loss of electrical power or a sensor input which prevents proper operation
of the engaged A/P and mode
· Loss of respective hydraulic system pressure.
BCD
· Pushing the A/P DISENGAGE bar down
Loss of the system A engine-driven hydraulic pump, and a heavy demand on
system A, may cause A/P A to disengage.
AUTO FLIGHT
737 Sec. 6.4 Page 3
Flight Manual Continental Rev. 11/15/02 #41
AFS Failures
Power interruption or loss may cause disengagement of the AFDS and/or A/T.
Re-engagement is possible after power is restored.
Dual channel A/P operation is possible only when two generators are powering
the busses.
Two independent radio altimeters provide radio altitude to the respective FCCs.
With a radio altimeter inoperative, do not use the associated FCC for approach
or landing, and do not use the associated autopilot for approach.
Flight Director Display
Turning a F/D switch ON displays command bars on the respective pilot attitude
indicator if command pitch and roll modes are engaged. If command pitch and
roll modes are not engaged, the F/D command bars do not appear. The F/Ds
can be operated with or without the A/P and A/T. F/D command modes can be
used with an A/P engaged in CWS.
F/D commands operate in the same command modes as the A/P except:
· The takeoff mode is a F/D only mode
· Dual F/D guidance is available for single engine operation
· The F/D has no landing flare capability. F/D command bars retract from
view at approximately 50 feet RA on an ILS approach.
Normally FCC A drives the Captain command bars and FCC B drives the First
Officer command bars. With both F/D switches ON, the logic for both F/D
modes is controlled by the master FCC, and both FMA displays show the same
mode status.
The master FCC is indicated by illumination of the respective master (MA) F/D
indicator light. The master FCC is determined as follows:
· With neither A/P engaged in CMD, the FCC for the first F/D turned on is
the master
· With one or both A/Ps engaged in CMD, the FCC for the first A/P in CMD
is the master FCC, regardless of which F/D is turned on first.
AUTO FLIGHT
Sec. 6.4 Page 4 737
Rev. 11/15/02 #41 Continental Flight Manual
F/D modes are controlled directly from the respective FCC under certain
conditions. This independent F/D operation occurs when neither A/P is
engaged in CMD, both F/D switches are ON and one of the following mode
conditions exists:
· APP mode engaged with LOC and G/S engaged
· GA mode engaged and below 400 feet RA
· TO mode engaged and below 400 feet RA.
Independent F/D operation is indicated by illumination of both MA lights. When
independent operation terminates, the MA light extinguishes on the slaved side.
If a generator is lost during a F/D TO or GA, or while in dual F/D APP mode
below 800 feet, the FCC on the unaffected side positions the F/D command bars
on both attitude indicators. If the F/D MA light on the affected side had been
illuminated, it extinguishes upon electrical bus transfer.
AFDS Status Annunciation
The following AFDS status annunciations are displayed in the A/P status
display located above the attitude indicator.
· CMD (one or both autopilots are engaged)
· FD (the flight director is ON and the autopilot is either OFF or engaged in
CWS)
· CWS P (pitch mode engaged in CWS)
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737 FLIGHT MANUAL 737飞行手册3(69)
