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* Go-around mode is not active
* VNAV arm/operate.
VNAV will engage in VNAV SPEED mode when:
* A climb or a speed descent flight phase is active
* The airplane is not in level flight
* VNAV mode is active.
VNAV will engage in VNAV PATH mode when:
* The airplane is holding altitude or a path descent is active
* Active lateral route (LNAV engaged)
* VNAV mode is active.
The climb flight phase is active when the flight crew sets a new
altitude on the mode control panel (MCP) and the airplane
climbs to the new altitude.
The speed descent flight phase is active when the flight crew
selects the SPEED prompt on the CDU descent (DES) page.
FMCS - FMC FUNCTIONAL DESCRIPTION - GUIDANCE SUB-FUNCTION - LNAV AND VNAV MODE LOGIC
EFFECTIVITY
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The path descent flight phase is active when the flight crew
selects PATH on the CDU descent (DES) page.
FMCS - FMC FUNCTIONAL DESCRIPTION - GUIDANCE SUB-FUNCTION - LNAV AND VNAV MODE LOGIC
EFFECTIVITY
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FMCS - FMC FUNCTIONAL DESCRIPTION - GUIDANCE SUB-FUNCTION - LNAV AND VNAV MODE LOGIC
FMCS - FMC FUNCTIONAL DESCRIPTION - GUIDANCE SUB-FUNCTION - LNAV AND VNAV MODE LOGIC
EFFECTIVITY
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General
The MCDU and FMCS both do internal BITE tests at power up. If
the power up test is normal, the MCDUs show the MENU page.
The MENU page always shows the FMC prompt at line select
key 1L. The other available sub-systems show below the FMC
prompt.
Selection of the FMC prompt or any FMCS mode key on the
MCDU makes the FMCS the active user and the IDENT page
shows.
The status of the sub-systems shows on the MENU page by the
label <ACT> to the right of the active sub-system. The label
<REQ> shows to the right of a sub-system if it is not active but
has sent a request to the MCDU to request operator attention.
The MENU page automatically shows if the FMC fails but the
FMC prompt will not show.
FMCS - DISPLAYS - CDU - GROUND POWER UP - 1
EFFECTIVITY
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FMCS - DISPLAYS - CDU - GROUND POWER UP - 1
FMCS - DISPLAYS - CDU - GROUND POWER UP - 1
EFFECTIVITY
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FMC
At power-up, the FMC does a BITE check. During the power-up,
the MCDU annunciators come on momentarily. If the FMC fails
at power-up, the FMC menu page does not show the FMC
prompt.
MCDU
A MCDU display is blank if the MCDU fails at power-up.
Other Tests
At power-up, the FMC also does a parity check of the airplane
and engine configuration program pins.
FMCS - DISPLAYS - CDU - GROUND POWER UP - 2
EFFECTIVITY
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FMCS - DISPLAYS - CDU - GROUND POWER UP - 2
FMCS - DISPLAYS - CDU - GROUND POWER UP - 2
EFFECTIVITY
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THIS PAGE IS INTENTIONALLY LEFT BLANK
FMCS - DISPLAYS - CDU - GROUND POWER UP - 2
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
General
This is an introduction to the MCDU pages the flight crew uses
to enter pre-flight data into the FMCS. More information about
each page is described in detail on subsequent pages.
Data
The flight crew uses this type of data to pre-flight the FMCS:
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