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· Selecting another pitch mode
· Glideslope capture
· Reaching end of LNAV route
· Transition of glideslope intercept waypoint or transition of glideslope
intercept waypoint if G/S is armed (as installed)
· Crosstrack deviation exceeds the RNP value during PTH descent for
an active leg with a database vertical angle and LNAV not engaged or
crosstrack deviation exceeds twice the RNP value during PTH descent
for an active leg with a database vertical angle and LNAV not engaged
(as installed)
· If the aircraft altitude is more than 200 feet below MCP altitude and
the autoflight system is not in altitude acquire.
In the event of glideslope intercept waypoint transition, VNAV can be reengaged.
AUTO FLIGHT
737 Sec. 6.4 Page 39
Flight Manual Continental Rev. 11/15/02 #41
= ALTITUDE Display
Displays selected altitude
· Displayed altitude is reference for altitude alerting and automatic leveloffs
· Altitude range is 0 to 50,000 feet in 100 foot increments
· Displays previously selected altitude when power first applied.
> Vertical Speed (VERT SPEED) Display
Displays:
· Blank when V/S mode not active
· Present V/S when V/S mode is engaged with V/S switch
· Selected V/S when V/S set with thumbwheel
· Range is -7900 to +6000 fpm.
Display increments are:
· 50 fpm if V/S is less than 1000 fpm
· 100 fpm if V/S is 1000 fpm or greater.
? Vertical Speed Thumbwheel
Rotate -
· DN –
- Sets vertical speed in VERT SPEED display
- Increases rate of descent or reduces rate of ascent.
· UP –
- Sets vertical speed in VERT SPEED display
- Increases rate of ascent or reduces rate of descent.
@ Level Change (LVL CHG) Switch
Push –
· LVL CHG switch light illuminates
· Pitch mode annunciates MCP SPD for climb or descent
· Autothrottle mode annunciates N1 for climb and RETARD followed by
ARM for descent
· IAS/MACH display and airspeed cursors display target speed.
AUTO FLIGHT
Sec. 6.4 Page 40 737
Rev. 11/15/02 #41 Continental Flight Manual
LVL CHG Mode
The LVL CHG mode coordinates pitch and thrust commands to make
automatic climbs and descents to preselected altitudes at selected airspeeds.
A LVL CHG climb or descent is initiated by:
· Selecting a new altitude
· Pushing LVL CHG switch
· Setting desired airspeed.
Climb –
· Autothrottle holds limit thrust
· AFDS holds selected airspeed.
Descent –
· Autothrottle holds idle thrust
· AFDS holds selected airspeed.
Airspeed –
· If a speed mode is active when LVL CHG is engaged, this speed is
retained as target speed
· If a speed mode is not active when LVL CHG is engaged, existing speed
becomes target speed
· Speed can be changed with MCP speed selector.
The LVL CHG mode is inhibited after glideslope capture.
A Approach (APP) Switch
(See Lateral Navigation)
B Altitude Selector (SEL)
Rotate –
· Sets altitude in ALTITUDE display in 100 foot increments
· Arms V/S mode if rotated while in ALT HOLD at selected altitude.
AUTO FLIGHT
737 Sec. 6.4 Page 41
Flight Manual Continental Rev. 11/15/02 #41
C Altitude Hold (ALT HLD) Switch
Push –
· Engages ALT HLD command mode
· Commands pitch to hold uncorrected barometric altitude at which
switch was pressed
· Annunciates ALT HLD pitch mode and illuminates ALT HLD switch light.
Altitude Hold Command Mode
ALT HLD mode commands pitch to hold either:
· MCP selected altitude
- Pitch mode annunciates ALT HOLD
- ALT HOLD switch light extinguishes.
· Uncorrected barometric altitude at which ALT HOLD switch was pressed
if not at MCP selected altitude
- Pitch mode annunciates ALT HOLD
- ALT HOLD switch light illuminates.
When in ALT HOLD at selected MCP altitude:
· Selecting a new MCP altitude illuminates the ALT HOLD switch light and
arms V/S mode
· LVL CHG, V/S, and VNAV climb and descent functions are inhibited until a
new MCP altitude is selected.
ALT HOLD mode is inhibited after G/S capture.
The selected MCP altitude is referenced to:
· Captain’s barometric altimeter setting for A A/P and F/D
· First Officer’s barometric altimeter setting for B A/P and F/D.
Note: After ALT HOLD engages, changes in altimeter barometric settings
do not change the selected altitude reference.
　
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