777 AIRCRAFT MAINTENANCE MANUAL
CMCS -FLIGHT LEG LOGIC
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CMCS -FLIGHT PHASES -1
Flight Phase Logic
The CMCF in AIMS calculates flight phases. A flight leg has several flight phases. The CMCF uses specific logic for these calculations. The logic includes:
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Only one flight phase is active at any time
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A flight phase remains active until conditions for a new flight phase exist
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The maintenance (MT) flight phase has priority over all other flight phases
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The engine start (ES) flight phase has priority over all flight phases except MT
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The shutdown (SD) flight phase has priority over all flight phases except ES and MT
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The go around (GA) flight phase has priority over all flight phases except MT, ES, SD and climb (CL)
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The approach (AP) and flare (FL) flight phases have priority over descent (DC).
Flight Phase Calculations
The CMCF uses specific inputs to calculate and transition flight phases. There are fifteen flight phases.
Flight phases show on various CMCS displays to show the part of the flight that a fault first becomes active.
Power On (PO) Flight Phase
PO is the CMCF default flight phase. The CMCF transitions to PO when both of these are true:
EFFECTIVITY
BEJ ALL
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There is power on the airplane
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No other flight phase conditions are true.
Engine Start (ES) Flight Phase
The CMCF transitions to ES when these are true:
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The airplane is on the ground
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An engine’s starter air valve transitions from closed to open.
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The engines fuel switch is in the RUN position
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N2 is less than idle.
Taxi Out (TA) Flight Phase
The CMCF transitions to TA when all of these are true:
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At least one engine has N2 equal to or greater than idle
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The airplane is on the ground
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The airplanes ground speed (GS) is less than 80 knots
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The flight leg transition is disabled.
Takeoff Roll (TO) Flight Phase
The CMCF transitions to TO when all of these are true:
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Both engines are running
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The airplane is on the ground
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The thrust resolver angle (TRA) for both engines is at takeoff
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Flaps/slats are set for takeoff
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GS is greater than 80 knots.
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CMCS -FLIGHT PHASES -1
Initial Climb (IC) Flight Phase
The CMCF transitions to IC when all of these are true:
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The airplane is in the air
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Flaps/slats are set for takeoff
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Mode control panel (MCP) altitude is above the airplane’s current altitude.
Climb (CL) Flight Phase
The availability of FMCF flight phase data determines how the CMCF transitions to CL.
When FMCF flight phase data is available, the CMCF transitions to CL when the FMCF flight phase transitions to CL.
When FMCF flight phase data is not available, the CMCF transitions to CL when all of these are true:
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The airplane is in the air
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The airplane climbs at more than 400 feet per minute.
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Radio altitude (RA) data shows that RA is greater than 1500 feet or RA data is not available and IC or go around (GA) has been active for two minutes.
Cruise (ER) Flight Phase
The availability of FMCF flight phase data determines how the CMCF transitions to ER.
When FMCF flight phase data is available, the CMCF transitions to ER when the FMCF flight phase transitions to cruise.
When FMCF flight phase data is not available, the CMCF transitions to ER when both of these are true:
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The airplane is in the air
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The airplane either climbs or descends at a rate less than 400 feet per minute.
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777 AIRCRAFT MAINTENANCE MANUAL
CMCS -FLIGHT PHASES -1
EFFECTIVITY BEJ ALL 45-10-00
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777 AIRCRAFT MAINTENANCE MANUAL
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