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MAINTENANCE MANUAL
C. Alerting messages (Fig. 36) will be displayed in the scratchpad of both CDUs regardless fo the contents previously displayed. If an alerting message is already in the scratch pads at the time another alerting message is received, the alerting message previously displyed will be stored in a stack type configuration and will be displayed when the scratchpad is cleared.
D. Advisory messages (Fig. 37) are of two types: data entry error advisory messages and basic advisory messages. The data entry errors will have priority over the basic advisory messages. All advisory messages will be displayed only on the CDU in which the condition has occurred.
E. CDU generated messages (Fig. 38) are the same as the alerting and advisory messages from the FMC. These messages are generated by the CDU while the CDU is the controlling unit. The only message generated by the CDU which is unique to the CDU is the TIMEOUT-RESELECT message.
12. Operations
__________
A. Functional Description
(1)
The FMCS can be used to plan the entire lateral and vertical flight plan. This preplanned flight profile will be considered by the FMCS to be the most economically feasible flight plan in terms of cost economy.
(2)
The FMCS will compute the lateral flight plan corresponding to the selected company route through use of data from the navigational data base. The lateral flight plan may be changed accordingly by manual entry through the CDU by crew while maintaining the efficiency.
(3)
The vertical flight plan is computed automatically by the FMC through the use of the performance data base (PDB) and speed, thrust and altitude targets either given by the PDB or entered manually by the pilot. The pilot also enteres a cost index number. This number relates time to fuel economy. The pilot can change this number accordingly in order to manipulate the flight plan.
(4)
The FMC also controls the thrust management function. This function, in conjunction with the automatic flight control system, automatically controls the airplanes' vertical maneuvers from takeoff to touchdown.
(5)
In addition to flight planning and thrust management, the FMCS calculates the estimated time of arrivial (ETA) and fuel remaining at enroute waypoints.
B. Control
(1) FMC flight preparation.
(a)
Provide external electrical power and energize the P6 Main Power Distribution Panel and the P7 Overhead Circuit Breaker Panel.
(b)
Ensure that the equipment cooling system is functioning correctly.
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MAINTENANCE MANUAL
MESSAGE / CONDITION ALERTING MESSAGES
VERIFY POSITION
THE DIFFERENCE BETWEEN COMPUTED RADIO POSITION AND FMC POSITION OR THE DIFFERENCE BETWEEN FMC POSITIONS EXCEEDS COMPARISON THRESHOLD
CYCLE IRS OFF-NAVIRS ALIGN PROBLEM REQUIRES CYCLING IRS MODE SWITCH
DESCENT PATH DELETED
THE LAST REMAINING ALTITUDE CONSTRAINT REQUIRED TO DEFINE THE DESCENT PROFILE IS DELETED
FUEL DISAGREE - PROG 2 TOTALIZER FUEL QUANTITY AND COMPUTED FUEL QUANTITY DISAGREE
ENTER IRS PORITION
FIVE SECONDS AFTER LINE SELECTION OF POSITION LAT/LONG INTO CDU FOR IRS INPUT, POSITION DATA OTHER THAN THAT CORRESPONDING TO THE SET IRS POSITION IS RECEIVED BACK FROM ANY IRS
PERF/VNAV UNAVAILABLE
INSUFFICIENT PERFORMANCE DATA IN FMC OR AIRCRAFT ALTITUDE GREATER THAN LIM ALT AND VNAV SELECTED ON THE MCP
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