Joined: 11 Dec 2005
|Posted: Wed Aug 22, 2012 6:27 pm Post subject: FMC Messages
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FMC ALERTING MESSAGES
ALIGNMENT REINITIATED – ADIRU alignment has automatically restarted due to airplane motion, or if the flight crew–entered initial position fails the alignment comparison tests.
CHECK ALT TGT – VNAV activates when the airplane is between the MCP and FMC altitudes. VNAV maintains level flight.
CHECK AIRLINE POLICY – after loading a new airline modifiable information file, the FMC determines a parameter is invalid. The FMC uses the loaded value and notifies the flight crew of the difference. This is a maintenance function. Note: If the scratchpad message is cleared, it does not display again for that load.
DESCENT PATH DELETED – VNAV active and all waypoint altitude constraints defining the descent profile deleted.
Note: This message displays before execution of the modification which deletes the descent path.
DISCONTINUITY – LNAV active and the route is not defined after the waypoint (except when the waypoint is before a manually terminated leg, such as FM, VM, HM legs).
• FM – a course from a fix to a flight crew entered manual route termination
• VM – a heading leg from a fix to a flight crew entered manual route termination
• HM – a holding pattern to a flight crew entered manual route termination.
DRAG REQUIRED – VNAV active and additional drag required or autothrottle off and less thrust required to maintain the VNAV descent path.
END OF OFFSET – LNAV active and two minutes prior to end of active route offset. AFDS maintains last heading if active route offset overflown.
END OF ROUTE – LNAV active and end of active route overflown. AFDS maintains last heading.
ENTER INERTIAL POSITION – the flight crew–entered present position did not pass one of the ADIRU comparison checks, or the ADIRU is ready to change to navigate mode and has not received a present position entry. Use the CLEAR key to remove this message.
ILS TUNE INHIBIT - MCP - flight control computers inhibiting changes in ILS tuning and either a manual operation in the ILS tuning field attempted or a new arrival ILS approach activated.
INERTIAL/ORIGIN DISAGREE – the airplane is on the ground and one of these conditions exist:
• The inertial position entered on the POS INIT page differs from the position of the origin airport in the active route by more than 6 NM.
• A route is activated and executed containing an origin airport with a position that differs from the ADIRU inertial position by more than 6 NM.
INSUFFICIENT FUEL – estimated fuel at destination less than entered RESERVES value. This may indicate an engine fuel leak.
LIMIT ALT FLXXX – the flight crew– or FMC–selected altitude is greater than the VNAV limit altitude.
LNAV BANK ANGLE LIMITED - before entering or while flying a curved path or holding pattern, the FMC predicts the LNAV roll command will be limited by thrust or buffet based roll limits.
NAV DATA OUT OF DATE – the clock calendar date is after the active navigation database valid calendar cycle.
NAV INVALID–TUNE XXXX – RNAV or VOR approach procedures must have a specific navaid tuned. It is either not tuned or a valid signal is not being received.
NO ACTIVE ROUTE – LNAV selected and no active route activated.
NO ROUTE DATA – in ALTN NAV, LNAV selected and the CDU does not have an active lateral route.
PERF/VNAV UNAVAILABLE – VNAV selected and gross weight, cost index, or cruise altitude are not entered.
RESET MCP ALT – 2 minutes prior to the top of descent point with VNAV active and MCP not set to altitude below cruise altitude.
RTA FIX DELETED – RTA fix has been deleted from the modified flight plan.
RW/ILS CRS ERROR –
• the airplane is within ILS automatic tuning range and the tuned ILS course does not match the course for the active arrival runway, or
• the FMC is not receiving valid course data from the same ILS the FMC is using for frequency data
• inhibited if scratchpad message ILS TUNE INHIBITED–MCP displayed.
RW/ILS FREQ ERROR –
• the airplane is within ILS automatic tuning range and the tuned ILS frequency does not match the frequency for the active arrival runway, or
• the FMC is not receiving valid frequency data from either ILS
• inhibited if scratchpad message ILS TUNE INHIBITED – MCP displayed.
SINGLE FMC L OPERATION – the right FMC is not operational.
SINGLE FMC R OPERATION – the left FMC is not operational.
TAKEOFF SPEEDS DELETED – selected V speeds are invalid.
THRUST REQUIRED – VNAV active, autothrottle disconnected, and additional thrust required to track VNAV descent path and maintain speed.
UNABLE FLXXX AT RTA FIX – predicted crossing altitude at RTA fix less than FLXXX, but predicted ETA within tolerance.
UNABLE HOLD AIRSPACE - the radius of the holding pattern calculated by the FMC exceeds the FMC maximum protected airspace limits.
UNABLE RTA – RTA not achievable within applicable arrival time tolerance.
UNABLE NEXT ALT – VNAV active and climb not sufficient to comply with waypoint altitude constraint.
VERIFY POSITION – the FMC calculation of airplane present position is based on conflicting data. The possible conflicts are:
• the active FMC and the inactive FMC positions differ by more than twice the RNP for 5 seconds
• the difference between the FMC position and the navigation aid being used (GPS, DME, VOR, or inertial) is greater than 12NM for 5 seconds.
VERIFY RNP – POS REF 2/3 – the default RNP has changed due to a change in flight phase and the flight crew entered RNP value exceeds the new default RNP value.
VIA OFFSET INVALID – flight conditions invalidate the modification with a divert to an alternate airport via OFFSET.
FMC COMMUNICATION MESSAGES
ALTN UPLINK – Up to four company–preferred alternate airports and associated data has been received and is available for preview on the ALTN page.
ALTN INHIBIT UPLINK – uplink contains two airports for the ALTN page 1/2 ALTN INHIB line.
ALTN LIST UPLINK – a company list of up to 20 alternate airports has been received and is available on the ALTN LIST page.
DES FORECST UPLINK READY – descent forecast data has been received and is available for loading on the DESCENT FORECAST page.
FLT NUMBER UPLINK – a new flight number has been received and is available on the RTE page 1/X.
INVALID TAKEOFF XXX/YYY – takeoff data for up to six runways or runway intersection pairs has been received but some data for one runway or runway intersection pair (RWXXX/YYY) is invalid.
PARTIAL ROUTE X UPLINK – a new route has been uplinked to the FMC but a portion of the route could not be loaded.
PERF INIT UPLINK – performance initialization data has been received and is available for preview on the PERF INIT page.
ROUTE X UPLINK READY – a new route or route modification has been received and is available for loading on the RTE X page.
TAKEOFF DATA LOADED – An uplink containing takeoff data matching the runway/position entry on the takeoff page is available for preview (only displays after an initial takeoff uplink has been received) or alternate thrust and/or flaps have been selected.
TAKEOFF DATA UPLINK – an uplink containing takeoff data matching the runway on the takeoff page is available for preview.
WIND DATA UPLINK READY – wind data has been received and is available for loading into the active route.
FMC ADVISORY MESSAGES
DELETE – DELETE key pushed.
HOLD AT XXXX – a waypoint not contained in the active route is entered into the HOLD AT box on the RTE LEGS page, after selection of the HOLD function key. Selection of HOLD AT XXXX into a RTE LEGS page waypoint line makes a holding fix at the XXXX waypoint.
INVALID ALTN UPLINK – a company–preferred list of alternate airports and associated alternate data has been received; the data is not valid and cannot be displayed.
INVALID ALTN LIST UPLINK – a company list of up to 20 alternate airports has been received; the data is not valid and cannot be displayed.
INVALID FLT NO UPLINK – a new flight number has been received; the data is not valid and cannot be displayed.
INVALID FORECAST UPLINK – descent forecast data has been received; the data is not valid and cannot be displayed.
INVALID PERF INIT UPLINK – performance initialization data has been received; the data is not valid and cannot be displayed.
INVALID ROUTE UPLINK – a new flight plan route or modification to the active flight plan route has been received; the data is not valid and cannot be displayed.
INVALID TAKEOFF UPLINK – takeoff data for up to six runways or runway–intersection pairs has been received; the data is not valid and cannot be
INVALID WIND DATA UPLINK – enroute wind data has been received; the data is not valid and cannot be displayed.
MAX ALT FLXXX – the altitude entry on any CDU page is above the performance calculated maximum altitude.
NOT ON INTERCEPT HEADING – LNAV selected and the airplane is outside active capture criteria and the present heading will not intercept the active leg.
ROUTE X UPLINK LOADING – a new flight plan route or modification to the active flight plan route has been received and is being loaded after flight crew selection of the LOAD prompt.
STANDBY ONE – the FMC requires more than 4 seconds to display data.
TIMEOUT–RESELECT – communication between the FMC and the CDU has failed. The flight crew must reselect FMC on the CDU MENU page.
UNABLE CRZ ALT – performance predicts a zero cruise time at the entered cruise altitude.
FMC ENTRY ERROR MESSAGES
ARR N/A FOR RUNWAY – the runway/approach selected is not compatible with arrival selected.
CRS REVERSAL AT FA FIX – a conflict exists between the default final approach (FA) waypoint (result of a runway or VFR approach selection) and the flight plan before it.
ENG OUT SID MOD – an engine failure is sensed after takeoff before the flaps are fully retracted; the FMC has automatically loaded an available engine out standard instrument departure as a route modification to the active route.
ILS TUNE INHIBITED – MCP – ILS tuning is inhibited with the:
• autopilot engaged, and localizer or glideslope captured
• only the flight director is engaged and either the localizer or the glideslope is captured, and the airplane is below 500 feet radio altitude.
Any attempt to manually change the ILS frequency or select another ILS approach on the CDU displays this message.
To make the necessary changes:
• above 1500 feet radio altitude – deselect approach on the MCP
• below 1500 feet radio altitude – select TO/GA
• disengage the autopilot
• turn both flight directors OFF, and
• turn at least one flight director ON.
INVALID DELETE – deletion of selected data is not allowed.
INVALID ENTRY – entry format or range is incorrect for the selected field or the entered airway or TO waypoint does not coincide with the navigation database.
NOT IN DATABASE – data is not in the route or the navigation database.
ROUTE FULL – the route is filled to the allowable capacity.
RUNWAY N/A FOR SID – selected runway not compatible with SID.
TAKEOFF FLAPS DELETED – the FMC has deleted the takeoff flap setting on the TAKEOFF REF page. This occurs when the THRUST REDUCTION value is changed to the same value as the takeoff flap setting.
STANDBY ONE – the FMC temporarily prevents further CDU inputs.
UNABLE TO SEND MSG – the selected data link message cannot be transmitted.
VERIFY RNP ENTRY – the entered RNP value is greater than the default RNP value for the present flight phase or, less than the present Actual Navigation Performance
V–SPEEDS UNAVAILABLE – for certain high thrust/low gross weight takeoff conditions, FMC V–speeds are not calculated. Adjust gross weight and/or takeoff thrust limit to enable V–speed calculations.
The FMC will protect for minimum control speeds by increasing V1, VR and V2 as required.
However, the FMC will not compute takeoff speeds for weights where the required speed increase exceeds the maximum certified speed increase.
This typically occurs at full rated thrust and light weights.
In this case, the message "V SPEEDS UNAVAILABLE" will appear on the FMC scratchpad and the takeoff speed entries will be blank.
Takeoff is not permitted in this condition as certified limits have been exceeded.
The options are to select a smaller flap setting, select derate thrust and/or add weight (fuel).
Selecting derate thrust is the preferred method as this will reduce the minimum control speeds.
Note that the assumed temperature method may not help this condition as the minimum control speeds are determined at the actual temperature and therefore are not reduced.
Incase of 777-200 LR: The FMC will not compute takeoff speeds for weights below those shown in the Minimum Weight for FMC Takeoff Speeds Calculation table.
In those cases where the required speed increase exceeds the maximum speed increase built into the FMC, the message "V SPEEDS UNAVAILABLE" will appear on the FMC scratchpad and the takeoff speed entries will be blank. This typically occurs at high rated thrust, high flaps setting and light weights.
To obtain speeds for the takeoff in these situations, the options are to use available performance software, or select a smaller flaps setting, or use reduced takeoff thrust and/or add weight.
Selecting derate thrust is the preferred method of reduced takeoff thrust as this will reduce the minimum control speeds.