737 Flight Crew Operations Manual
Automatic Flight -
Controls and Indicators
Boeing Proprietary. Copyright © Boeing. May be subject to export restrictions under EAR. See title page for details.
D6-27370-866-EGP 4.10.7
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 IAS/MACH Selector.
The LVL CHG mode is inhibited after glideslope capture.
6 Approach (APP) Switch
(See Lateral Navigation)
7 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.
8 Altitude Hold (ALT HLD) Switch
Push –
• engages ALT HOLD command mode
• commands pitch to hold uncorrected barometric altitude at which switch
was pressed
• annunciates ALT HOLD pitch mode and illuminates ALT HLD switch
light.
Altitude Hold Command Mode
ALT HOLD mode commands pitch to hold either:
• MCP selected altitude
• pitch mode annunciates ALT HOLD
• ALT HLD switch light extinguishes.
September 26, 2013
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