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MAINTENANCE MANUAL
BASIC PITCH MODE ON AUTOPILOT ENGAGEMENT
COMMANDS TO ACQUIRE & HOLD SELECTED V/SVERTICAL SPEED MODE
AUTOMATICALLY OR (V/S)MANUALLY (MCP) SELECTED
PITCH ATTITUDE TO ACQUIRE & MAINTAIN SELECTED AIRSPEED OR MACH
COMMANDS TO ACQUIRE & MAINTAIN SELECTED ALTITUDE AT SELECTED SPEED
MANUALLY SELECTED ON MCP
PROVIDES FLAP PLACARD & MIN SPEED LIMIT PROTECTION
VERTICAL NAVIGATION
MANUALLY SELECTED ON MCP RESPONDS TO VERTICAL STEERING COMMANDS FROM
MODE (VNAV) FMC
GLIDESLOPE ACTIVE
MANUALLY SELECTED ON MCP COMMANDS TO ACQUIRE AND TRACK G/S BEAM MODE (APP)
AUTOMATICALLY CAPTURES PRESELECTED ALTITUDEAUTOMATICALLY AND MANUALLY ALTITUDE MODE
SELECTED ON MCP (HOLD) HOLD ALTITUDE DISPLAYED ON MCP ALT SELECT
ACTIVE WINDOW IF HOLD NOT PUSHED(ALT SEL/HOLD)
HOLDS ALTITUDE AT TIME HOLD PUSHED
MCP Selectable Pitch & Roll Functions
Figure 11 (Sheet 2)
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MAINTENANCE MANUAL
FROM TO T/O V/S HOLD ALT CAPT ALT FL CH VNAV G/A G/S
T/O . YES YES 4 YES 1 YES NO
V/S NO . YES YES YES 1 YES YES
ALT HOLD NO YES . . YES 1 YES YES
ALT CAPT NO YES . . YES 1 YES YES
FL CH NO YES YES 3 . 1 YES YES
VNAV NO YES YES NO YES . YES YES
G/A NO 1 1 4 1 1 . NO
G/S NO 2 2 NO 2 NO YES .
PITCH
YES WHEN ABOVE
YES IF SUFFICIENT 400 FEET RAD ALT
THRUST YES BEFORE
YES WHEN ABOVE 800 FEET RAD ALT LOC ACTIVE AND IF SUFFICIENT THRUST
FROM TO T/O HDG HOLD HDG SEL LNAV ACTIVE LOC G/A
T/O . YES YES 7 NO YES
HDG HOLD NO . YES 7 YES YES
HDG SEL NO YES . 7 YES YES
LNAV NO YES YES . YES YES
LOC ACTIVE NO 5 5 5 . YES
G/A NO 6 6 6 NO .
ROLL
YES BEFORE
YES WHEN ABOVE G/S ACTIVE 400 FEET RAD ALT
YES WHEN ABOVE 50 FEET RAD ALT
Pitch and Roll Mode Transitions Figure 12
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2) Once HDG HOLD mode is engaged, it can be disabled if CMD is disabled or the F/D is turned off. Heading hold is also disabled by selection of the following modes: HDG select, LNAV, LOC capture, or GA.
(e) Heading Select 1) Heading select mode acquires and maintains the heading selected on the MCP. It has 6 selectable bank angle limits: AUTO and 5°-25° in 5 degree steps. The AUTO position selects a B/A based on true airspeed and heading error with a maximum angle of 25 degrees. The heading select mode can be manually called by pushing the HDG SEL switch on the MCP. a) If the HDG SEL knob is rotated to the desired heading before the SEL switch is pressed, the AFDS commands a turn towards that heading in the direction of the smallest turn angle.
b) If the SEL switch is pressed first, the AFDS commands generated are always in the direction the HDG SEL knob is turned.
(f) Lateral Navigation Mode (LNAV) 1) The LNAV mode responds to FMC lateral steering commands to acquire and track selected flight plan paths. LNAV mode is selected by pressing the LNAV switch/light on the MCP. Pressing the LNAV switch/light arms the LNAV mode, provided localizer is not captured. LNAV arm is then displayed white on the PFDs. LNAV ARM has no effect on the current lateral axis mode and may be disengaged by pressing the LNAV switch/light a second time. 2) The same signal that lights the LNAV switch/light is provided, by the MCP, to the Flight Management System (FMS) to enable LNAV steering commands from the FMC (Ref 34-61-00).
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