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attitude limits when control force is released.
· If roll control force is released with less than 6 degrees of bank,
autopilot rolls wing level and holds existing heading.
· Command modes are available for F/D operation through the mode
selector switches.
> OFF – Respective autopilot is disengaged.
AUTO FLIGHT
737 Sec. 6.4 Page 53
Flight Manual Continental Rev. 11/15/02 #41
Autopilot / Autothrottle Controls
< Autopilot Disengage Switch
Push –
· Disengages both autopilots
· A/P disengage lights flash
· A/P disengage warning tone sounds for a minimum of two seconds
· Second push extinguishes disengage lights and silences disengage
warning tone
· If autopilot automatically disengages, extinguishes A/P disengage
lights and silences A/P warning tone.
= Autothrottle Disengage Switches
Push –
· Disengages autothrottle
· A/T disengage lights flash
· A/T ARM switch trips OFF
· Second press extinguishes A/T disengage lights
· Extinguishes A/T disengage lights after automatic A/T disengagement.
> Takeoff / Go-Around (TO/GA) Switches
Push – Engages AFDS and A/T in takeoff or go-around mode if previously
armed.
AUTO FLIGHT
Sec. 6.4 Page 54 737
Rev. 11/15/02 #41 Continental Flight Manual
Autopilot / Autothrottle Indicators
< Autopilot (A/P) Disengage Light
Illuminated (red) –
· Flashes and tone sounds when autopilot has disengaged
· Reset by pushing either disengage light or either A/P disengage switch
· Steady for any of following conditions:
- Stabilizer out of trim below 800 feet RA on dual channel
approach
- ALT ACQ mode inhibited during A/P go-around if stabilizer not
trimmed for single A/P operation
- Disengage light test switch held in position 2
- Automatic ground system tests fail.
Illuminated (amber) –
· Steady – disengage light test switch held in position 1.
= Autothrottle (A/T) Disengage Light
Illuminated (red) –
· Flashing – autothrottle has disengaged
· Steady – disengage light test switch held in position 2.
Illuminated (amber) –
· Steady – disengage light test switch held in position 1
AUTO FLIGHT
737 Sec. 6.4 Page 55
Flight Manual Continental Rev. 11/15/02 #41
> Disengage Light Test (TEST) Switch
TEST 1 – illuminates autopilot / autothrottle degraded mode and FMC alert
lights steady amber.
TEST 2 – illuminates autopilot / autothrottle disengage steady red.
Spring-loaded to center position.
? Stabilizer Out Of Trim (STAB OUT OF TRIM) Light
Operates only with autopilot engaged. Remains extinguished with autopilot
not engaged.
Illuminated (amber) – autopilot not trimming stabilizer properly.
AUTO FLIGHT
Sec. 6.4 Page 56 737
Rev. 11/15/02 #41 Continental Flight Manual
> Thrust Mode Annunciators
< Cruise (CRZ)
(White on black) – Indicates cruise mode is engaged.
= Climb (CLB)
(White on black) – Indicates climb mode is engaged.
> REDUCED
(White on black) – Indicates reduced takeoff or reduced climb mode is
engaged.
? Takeoff (TO)
(White on black) – Indicates takeoff mode is engaged.
@ Continuous (CON)
(White on black) – Indicates maximum continuous thrust mode is engaged.
A Go Around (GA)
(White on black) – Indicates a go around mode is engaged.
AUTO FLIGHT
737 Sec. 6.4 Page 57
Flight Manual Continental Rev. 11/15/02 #41
> Degraded A/T Annunciation
< A/T LIMIT
(Black on white) – Indicates degraded autothrottle operation due to loss of
FMC or N1 signals. Appears with active autothrottle mode.
AUTO FLIGHT
Sec. 6.4 Page 58 737
Rev. 11/15/02 #41 Continental Flight Manual
>@ Thrust Mode Annunciator (As Installed)
The thrust mode annunciator panel is on the center instrument panel above the
N1 RPM indicators. It displays the active N1 limit reference mode for
autothrottle and manual thrust control. N1 limits are also displayed on the N1
RPM indicator cursors with the reference knobs pushed in.
N1 limits are normally calculated by the FMC. When FMC N1 limit calculations
become invalid, or if either engine N1 is less than 18%, A/T LIM is annunciated.
The autothrottle computer then calculates a single N1 limit for the affected
engine(s).
< R – Reduced. Can appear with TO and CLB.
= TO – Takeoff.
> CLB – Climb.
? CRZ – Cruise.
　
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