CMCS -FLIGHT PHASES -2
Descent (DC) Flight Phase
The availability of FMCF flight phase data determines how the CMCF changes to DC.
With FMCF flight phase data available, the CMCF changes to DC when the FMCF flight phase changes to descent.
With FMCF flight phase data not available, the CMCF changes to DC when both of these conditions are true:
*
The airplane is in the air
*
The airplane descends at more than 400 feet per minute.
Approach (AP) Flight Phase
The CMCF changes to AP when all of these are true:
*
The airplane is in the air
*
The flaps are set for landing
*
The landing gear is down.
Go-Around (GA) Flight Phase
There are two conditions that cause the CMCF to change to GA.
For the first condition, the CMCF changes to GA when both of these are true:
*
The airplane is in the air
*
The TOGA switch is set.
EFFECTIVITY
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For the second condition, the CMCF changes to GA when all these are true:
*
The airplane is in the air
*
The flaps have changed from landing to takeoff
*
The TRA for both engines is set for takeoff.
Flare (FL) Flight Phase
The CMCF changes to FL when all of these are true:
*
The airplane is in the air
*
The flaps are set for landing
*
Radio altitude is less than 50 feet.
Rollout (RO) Flight Phase
The CMCF changes to RO when all of these are true:
*
The airplane is on the ground
*
Ground speed is more than 80 knots.
Taxi In (TI) Flight Phase
The CMCF changes to TI when all of these are true:
*
The airplane is on the ground
*
At least one engine is running
*
Ground speed is less than 80 knots
*
The flight leg transition is enabled.
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CMCS -FLIGHT PHASES -2
Shutdown (SD) Flight Phase
The CMCF changes to SD when all of these are true:
*
The airplane is on the ground
*
The starter air valve is closed
*
Either engine fuel switch changes from RUN to CUTOFF and the EEC is active.
Maintenance (MT) Flight Phase
There are two conditions that cause the CMCF to change to MT.
For the first condition, the CMCF changes to MT when both of these are true:
*
Aircraft vibration monitoring (AVM) onboard engine balancing system (OEBS) on the MAT is in test
*
The airplane is on the ground.
For the second condition, the CMCF changes to MT when the maintenance phase is selected on the maintenance enable/ disable dialog box on the MAT.
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777 AIRCRAFT MAINTENANCE MANUAL
CMCS -FLIGHT PHASES -2
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CMCS -CMCF CORRELATION
General
The central maintenance computing function (CMCF) in the AIMS cabinets monitors systems for failures and reports these failures as maintenance messages.
The primary display function (PDF) in the AIMS cabinets also monitors systems for faults that show on these displays:
*
PFD
*
ND
*
EICAS
*
MFD.
These faults show as failure flags, messages, or non-normal displays. The PDF groups these indications and calls them flight deck effects (FDEs). The flight crews report these FDEs as log book entries. The PDF sends the FDEs to the CMCF.
The CMCF correlates or associates these maintenance messages with an FDE and makes displays that show on the MAT.
Correlated maintenance messages also relate to and cause maintenance memos.
The CMCF also generates non-correlated maintenance messages. These messages do not relate to an FDE but provide useful maintenance data.
Correlated Maintenance Messages
Correlated maintenance messages are those messages that are directly linked to a FDE or a maintenance memo (MO). These are the requirements to correlate a message to an FDE:
*
They must both be active or latched at the same time
*
The FDE and maintenance message must match on a CMCS correlation list.
Flight Deck Effects
These are the nine categories of flight deck effects:
*
EICAS warning messages
*
EICAS caution messages
*
EICAS advisory messages
*
EICAS status messages
*
PFD flags
*
ND flags
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