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automatically revert to a more effective combination. The reversion modes are:
· Placard limit reversion
· Minimum airspeed reversion.
Mode reversion occurs slightly before reaching the limit speed. Both the AFDS
and A/T have reversion modes which activate according to the condition
causing the reversion.
Placard Limit Reversion
When one of the placard limit reversions (gear, flap or Vmo/Mmo) is reached,
the overspeed limiting symbol appears in the MCP IAS/Mach display and the
following occurs:
· If not in AFDS or A/T speed control and the A/T is armed, the A/T reverts to
SPEED and controls speed to the placard limit
· If in AFDS or A/T speed control, no reversion is necessary. The AFDS or
A/T, whichever is controlling speed, holds speed slightly below the placard
limit
· If the A/T is not available, no reversion response to gear or flap placard
speeds is available. The AFDS reverts to speed control for Vmo/Mmo
speed limiting.
AUTO FLIGHT
737 Sec. 6.4 Page 31
Flight Manual Continental Rev. 11/15/02 #41
Minimum Speed Reversion
The AFDS and A/T do not control to a speed which is less than minimum speed
for the current flap configuration. This speed is approximately 1.3 Vs.
Minimum speed, FMC speed, or selected speed, whichever is higher, becomes
the AFS commanded speed. If actual speed becomes equal to or slightly less
than the minimum speed, the underspeed limiting symbol appears in the MCP
IAS/Mach Display, and if operating in the V/S mode, the AFDS reverts to LVL
CHG.
The AFS commands a speed 5 knots greater than minimum speed. Selecting a
speed 15 knots greater than minimum speed reactivates normal MCP speed
selection control. The AFDS commands nose down pitch to increase airspeed if
the thrust levers are not advanced. When actual speed becomes 15 knots
greater than minimum speed, the underspeed limiting symbol disappears.
The A/P disengages and the F/D command bars retract when in a LVL CHG climb
with a command speed equal to minimum speed and a minimum rate of climb
cannot be maintained without decelerating.
Minimum speed reversion is not available when the A/T is OFF and the AFDS is
in ALT HOLD, ALT ACQ or after G/S capture.
> Performance Limit Reversion
This function occurs only while operating in the V/S mode when the selected
vertical speed and airspeed combination exceeds the thrust capability to
maintain the selected airspeed. If airspeed becomes more than 5 knots below
the MCP selected airspeed and is not increasing, the AFS reverts to LVL CHG and
the underspeed symbol appears in the MCP IAS/Mach display.
The underspeed symbol remains displayed until a difference speed or a different
pitch mode is selected.
Performance limit reversion can occur with the A/T OFF and the Autopilot ON.
AUTO FLIGHT
Sec. 6.4 Page 32 737
Rev. 11/15/02 #41 Continental Flight Manual
INTENTIONALLY LEFT BLANK
AUTO FLIGHT
737 Sec. 6.4 Page 33
Flight Manual Continental Rev. 11/15/02 #41
CONTROLS AND INDICATORS
Mode Control Panel (MCP)
Two different mode control panel formats are found in the B737 fleet. Later
B737s have mode selector switch lights that show two small green lights when
illuminated. Earlier B737s switch lights annunciate ON when the switch light is
illuminated. Mode selector switch light functions are the same on all B737s.
Later B737s have individual switch lights for respective autopilot engagement
in command (CMD) and control wheel steering (CWS). Earlier B737s have
“paddle” switches for respective autopilot engagement. A disengage bar for
simultaneous disengagement of both autopilots is installed on later aircraft. The
mode selector switch light format is used throughout the flight manual.
AUTO FLIGHT
Sec. 6.4 Page 34 737
Rev. 11/15/02 #41 Continental Flight Manual
Speed Controls
< Autothrottle (A/T) Arm Switch
ARM – Arms A/T for engagement. Magnetically held at ARM. A/T engages
automatically when following AFDS modes are engaged:
· LVL CHG
· ALT ACQ
· V/S
· VNAV
· ALT HOLD
· G/S capture
· TO/GA.
OFF – Disengages A/T and prevents A/T engagement.
= Autothrottle Indicator Light
Illuminated (green) – A/T ARM switch in ARM position.
> Changeover (C/O) Switch
Push –
· Changes IAS/MACH display between IAS and MACH
· Automatic changeover occurs at approximately FL260.
AUTO FLIGHT
737 Sec. 6.4 Page 35
Flight Manual Continental Rev. 11/15/02 #41
? MCP Speed Condition Symbols
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