FMC Messages Flashcards
CRZ ALT CHANGED TO XXXXX
U10.5 and later
CLEAR THE MESSAGE. VERIFY MCP CRUISE ALTITUDE. Cause - An altitude constraint added due to entering a new company route, a new destination airport, or selection of a new procedure conflicts with the cruise altitude, resulting in automatically raising the cruise altitude to match the highest waypoint altitude constraint in the mod plan, when not in active descent.
CHECK ALT TGT
U10.5 and later
CLEAR THE MESSAGE. Cause - VNAV disengages while airplane is between MCP and FMC altitudes or VNAV button pressed while airplane is between MCP and FMC altitudes.
CUTBACK DISARMED
U10.6 and later
CLEAR THE MESSAGE. RE-ARM AS REQUIRED. Cause - Cutback turned off as a result of changing or deleting the flight plan runway while on the ground.
CUTBACK UNAVAILABLE
U10.3 and later
CLEAR THE MESSAGE. Cause - The FMC is unable to compute a Cutback N1 value.
CYCLE IRS OFF–NAV
CYCLE IRS MODE SELECTOR TO “OFF” AND BACK TO “NAV.” Cause - IRS is unable to complete alignment under current conditions.
DATA BASE INVALID
ADVISE MAINTENANCE PERSONNEL TO CHECK THE FMC AND RELOAD THE DATABASE, AS REQUIRED. IF DESIRED, CONSIDER THE USE OF THE TEMPORARY NAV DATABASE. Cause - The automatic validity test of the permanent navigation database has failed.
DISCO INSRTD AFTR
XXXXX (waypoint identifier)
SELECT THE RTE OR RTE LEGS PAGES AND MODIFY THE WAYPOINTS FOR A CONTINUOUS ROUTE. Cause - A ROUTE DISCONTINUITY has
been inserted into the flight plan due to undefined termination of a downpath leg or a triple waypoint BYPASS.
DISCONTINUITY
SELECT THE RTE LEGS PAGE. ENTER THE DESIRED ACTIVE WAYPOINT INTO THE BOX PROMPTS. CORRECT ANY ROUTE DISCONTINUITY AND
EXECUTE. REENGAGE LNAV. Cause - Passing the last waypoint in the route prior to a ROUTE DISCONTINUITY
(LNAV disengages) or pressing LNAV while in a discontinuity.
DRAG REQ AFTER XXXXX
U10.7 and later
MODIFY FLIGHT PLAN AS REQUIRED.
CLEAR THE MESSAGE. Cause - A waypoint speed constraint greater than 10 knots above the predicted speed exists at waypoint XXXXX.
END OF OFFSET
CONFIRM CLEARANCE. Cause - Two minutes prior to passing offset leg termination.
END OF ROUTE
SELECT THE RTE LEGS PAGE. ENTER THE DESIRED ACTIVE WAYPOINT INTO THE DASH PROMPTS AND EXECUTE. REENGAGE LNAV. Cause - LNAV engaged and passing the last waypoint in the route (LNAV disengages).
ENG OUT SID MOD
U10.3 and later
CLEAR THE MESSAGE. Cause - An engine–out SID has been automatically inserted into the flight plan as a modification.
ENTER IRS POSITION
ENTER IRS PRESENT POSITION INTO THE SCRATCHPAD PAD AND LINE SELECT 4R ON THE POS INIT PAGE OF THE CDU. IF PRESENT POSITION WAS PREVIOUSLY ENTERED, OVERWRITE DISPLAYED DATA. IF NECESSARY, ENTER PRESENT POSITION DIRECTLY INTO THE IRS CONTROL
/DISPLAY UNIT. Cause - IRS in the alignment mode needs present position to complete alignment. Previous present position entry was not received back from the IRS.
FMC APP/TUNE DISAGREE
U10.5 and later
CONFIRM THE TUNED FREQUENCY AND APPROACH SELECTED IN THE FMC ARE BOTH CONSISTENT WITH THE ACTUAL APPROACH INTENDED TO BE FLOWN. RESOLVE TUNING OR APPROACH SELECTION INCONSISTENCY. CLEAR THE MESSAGE. Cause - An approach that utilizes FMC generated glide path is in the active flight plan but an approach navaid (ILS/GLS) has been tuned with G/S ON.
FMC DISAGREE
U10.8 and later
MONITOR FMCS CLOSELY. BOTH FMCS REMAIN ONLINE. LIMIT APPROACHES TO SINGLE FMC ONLY. IF DESIRED, REVERT TO SINGLE FMC
OPERATION IN THIS SECTION. Cause - During approach or on the ground, monitored parameters required for dual FMC operation are in disagreement. (Dual FMC as installed) Message will remain displayed until the condition has been resolved. The FMC does not check for mach and indicated air speed miscompares on the ground.
FMC DISAGREE - VERTICAL
U10.8A and later
DO NOT MOVE THE FMC SOURCE SELECT SWITCH. MONITOR CROSSING ALTITUDES TO ENSURE COMPLIANCE. Cause - A vertical deviation, FMC Airspeed, or FMC Mach value disagreement between the FMCs by more than the allowed tolerance occurs and long enough that all attempts to resynchronize failed while the aircraft is in a path descent. Message display is inhibited when in the Approach Nav environment. (dual FMC as installed)
FMC POS/RW DISAGREE
U10.7 and later
REFER TO FMC NAVIGATION CHECK SUPPLEMENTARY PROCEDURE. Cause - Position information is contradictory.
GPS-L INVALID GPS-R INVALID
U10.7 and later
CLEAR THE MESSAGE.
FOR ADS-B OPERATIONS (IF INSTALLED), WHEN ONE GPS IS INVALID, ENSURE THAT THE TRANSPONDER SELECTOR IS POSITIONED TO THE SIDE WITH THE VALID GPS.
FOR DUAL GPS INSTALLATIONS, IF BOTH GPS-L INVALID AND GPS-R INVALID
MESSAGES SHOW, REFER TO FMC NAVIGATION CHECK SUPPLEMENTARY PROCEDURE.
FOR SINGLE GPS INSTALLATIONS, REFER TO FMC NAVIGATION CHECK SUPPLEMENTARY PROCEDURE Cause - FMC is no longer receiving valid information from the displayed GPS system.
INSUFFICIENT FUEL
U13.0 and later
MODIFY THE ROUTE PLAN OR CRUISING ALTITUDE, OR DIVERT FOR ADDITIONAL FUEL. Cause - FMC fuel at the destination is predicted to be less than 2000 lbs/900 kilograms.
Scratchpad message shows for Active and Mod Flight Plan.
Illuminates the FMC P/RST Light for Active and Mod Flight Plan.
IRS MOTION
CLEAR MESSAGE AND ATTEMPT TO REDUCE AIRPLANE MOVEMENT, IF PRACTICABLE. Cause - IRS has automatically restarted the alignment due to detection of excessive motion.
IRS-(L or R) DRIFT
U11.0 and later
REFER TO FMC NAVIGATION CHECK SUPPLEMENTARY PROCEDURE. Cause - An FMC has detected that the IRS-(L or R) position or velocity data is unreasonable, and deselected IRS-(L or R) due to velocity divergence or position blunder checks.
IRS POS/ORIGIN DISAGREE
U10.7 and later
REFER TO FMC NAVIGATION CHECK SUPPLEMENTARY PROCEDURE. Cause - Position information is contradictory.
LNAV BANK ANGLE LIMITED
U10.6 and later
REVIEW THE LNAV COURSE CHANGE. IF COURSE CHANGE EXCEEDS AIRWAY/ROUTE BOUNDARY, CONSIDER FLIGHT PLAN CHANGE. Cause - LNAV is engaged and the airplane is not on a lateral offset and is not near or in an orbit or hold and the airplane is within 5 minutes or less from an LNAV guided course change, and will exceed the airway/route boundaries for
non-flyover turns less than or equal to 135 degrees due to performance limited bank angle. This message does not apply to fixed radius turns.
MAX ALT FLXXX
flight level value
CLEAR THE MESSAGE. Cause - Altitude intervention (as installed) attempt to raise cruise altitude when MCP altitude is above maximum altitude.