Flight Management Navigation - Messages

EICAS and CDU Messages

Message Level Light Condition
L FMC Fail
R FMC Fail
Advisory FAIL FMC has failed.
FMC Message Advisory FMC A message is in the FMC scratchpad.
L IRS DC FAIL
C IRS DC FAIL
R IRS DC FAIL
Advisory DC FAIL IRS DC backup power has failed and the IRS AC normal power is being used.
L IRS FAULT
C IRS FAULT
R IRS FAULT
Advisory FAULT An IRS fault is detected.
L IRS ON DC
C IRS ON DC
R IRS ON DC
Advisory ON DC Indicated IRS AC normal power has failed and the IRS DC backup power is being used.
 
ATC FAULT Advisory ATC FAIL Selected Transponder has failed.
SB Changes with no fail light on ATC panel
ATC FAULT Advisory   Selected Transponder has failed.
As installed
ATC FAULT Advisory XPNDR FAIL Selected Transponder has failed.
Message Level Light Condition
L GPS
R GPS
Advisory   GPS has failed.
UNABLE RNP Advisory FMC Navigation Performance not meeting required accuracy.
Caution Caution Message is a caution if fault occurs when the airplane is on approach. Message is an advisory if fault occurs when airplane is not on approach.

FMC Messages

FMC messages alert the flight crew to conditions that could degrade the system operation and advise the crew of input errors.

The messages are categorized as:

The scratchpad messages display according to their level of importance. A less important message replaces another message in the scratchpad when the CLEAR key is pushed or the condition is corrected.

The FMC light illuminates and the EICAS advisory message FMC MESSAGE displays when there is an FMC alerting message.

Scratchpad advisory messages appear in the scratchpad without an EICAS message or FMC light. All FMC messages illuminate the CDU message (MSG) light. Clear the message or correct the condition to cancel the message.

On airplanes with the PEGASUS FMC installed the message is temporarily removed from the scratchpad when manually entering data. The message returns when the manual entry is removed from the scratchpad.

On other FMCs the scratchpad must be cleared before manual entries are possible.

FMC Alerting Messages

FMC alerting messages:

Use the CLEAR key or correct the condition responsible for the message to remove the message.

CHECK AIRLINE POLICY
(PEGASUS FMC)

After loading a new airline modifiable information file, the FMC determines a parameter is invalid. The FMC uses the default value. This is a maintenance function.

CHECK ALT TGT

VNAV active and the airplane is between the MCP and FMC altitudes. VNAV maintains level flight.

CYCLE IRS OFF - NAV

With the airplane on the ground any IRS has detected a condition that requires cycling inertial power off and back to NAV.

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 airplane has passed the last waypoint prior to a route discontinuity (except on a manually terminated leg, such as a VECTORS legs).

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 IRS POSITION

The flight crew-entered present position did not pass one of the IRS comparison checks, or the IRS is ready to change to navigate mode and has not received a present position entry. Use the CLEAR key to remove this message.

FMC L (or R) OUTPUT LOSS
(PEGASUS FMC)

Data output or discreet signals from indicated FMC are lost.

FUEL DISAGREE - PROG 2

Totaliser Fuel Quantity and FMC calculated Fuel Quantity disagree by a significant amount.

FUEL QTY ERROR - PROG 2

(SB changes affects display of message.)
Totaliser Fuel Quantity and FMC calculated Fuel Quantity disagree by a significant amount. This message is replaced by the FUEL DISAGREE message on later FMCs.

INSUFFICIENT FUEL

Estimated fuel at destination less than entered RESERVES value.

IRS MOTION

An IRS has detected motion while in ALIGN.

IRS NAV ONLY

the FMC has been without radio or GPS updating for a predetermined period of time.

IRS POS/ORIGIN DISAGREE

valid inertial position differs from active origin airport.

LIMIT ALT FLNNN

VNAV engaged and cruise altitude greater than VNAV limit altitude.

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 or a valid signal is not being received.

NO ACTIVE ROUTE

LNAV is selected and no route is activated.

PERF/VNAV UNAVAILABLE

VNAV selected and either gross weight, cost index or cruise altitude are not entered.

PURGE UPDATES - POS 2

Multiple navaids rejected by the FMC due to a position error.

RESET MCP ALT

2 minutes prior to the top of descent point with VNAV active and MCP not set to an altitude below cruise altitude.

RESYNC FAIL - SINGLE FMC

Resynchronization attempt failed and one FMC is shutdown.

RESYNCING OTHER FMC

offside FMC has just powered up or failed comparison data check and is being resynchronized to onside FMC.

RW/ILS CRS ERROR

LOC mode armed and the selected ILS course is incorrect for the active route runway.

RW/ILS FREQ ERROR

Selected ILS frequency does not match frequency for runway in active route.

SET CLOCK TO UTC TIME

the UTC time from the GPS disagrees with the captains clock by more than 12 seconds.

SINGLE FMC L (or R) OPERATION
(PEGASUS FMC)

Only the indicated FMC is operating.

SINGLE FMC OPERATION

One FMC is not operational.

SPLIT IRS OPERATION
(PEGASUS FMC)

A fault exists on an IRS making only two IRSs available for navigation.

TAKEOFF SPEEDS DELETED
(PEGASUS FMC)

Selected V speeds have been deleted due to changes in takeoff performance or configuration data.

THRUST REQUIRED

VNAV active, Autothrottle disconnected, and additional thrust required to track VNAV descent path and maintain speed.

UNABLE NEXT ALT

VNAV active and climb not sufficient to comply with waypoint altitude constraint.

VERIFY POSITION

The difference between the FMC position and other position data exceeds a comparison threshold. The possible conflicts are:

  • The left FMC position differs from the right FMC position.
  • The radio position, with radio updating, differs from the FMC position.
  • The GPS position, with GPS updating, differs from the FMC position.
VERIFY RNP - POS REF 2

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 Advisory Messages

FMC advisory messages are displayed on the CDU scratchpad and illuminate the CDU message light (MSG). There are no EICAS messages associated with these messages and they do not cause the FMC light to illuminate.

Those messages which are caused by an entry error must be cleared before the entry can continue.

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.

DELETE

DEL key pushed.

ENG OUT SID MOD
(PEGASUS FMC)

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.

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 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.

INVALID TUNE REQUEST

Attempt to remotely tune a VOR is not valid.

PEGASUS FMC KEY/FUNCTION INOP

Selected mode key is inoperative.

MANUALLY TUNED

Attempt to remotely tune a VOR that is manually tuned.

MAX ALT FL-XXX

The altitude entry on any CDU page is above the performance calculated maximum attitude.

NO ACTIVE ROUTE

DIR/INTC button pressed without an active route.

NOT IN DATABASE

Data is not in the route or the navigation database.

NOT ON INTERCEPT HEADING

LNAV selected and the airplane is outside active capture criteria and the present heading will not intercept the active leg.

RE-ENTER IRS POSITION

(SB changes affects display of message.)
the flight crew-entered SET IRS POS disagrees with data in the IRS. This message has been replaced by the ENTER IRS POSITION on later FMCs.

ROUTE FULL

The route is filled to the allowable capacity.

RUNWAY N/A FOR SID

Selected runway not compatible with SID.

RW/ILS FREQ ERROR

The selected ILS frequency does not match frequency for runway in active route.

STANDBY ONE

The FMC temporarily prevents further CDU inputs.

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.


VERIFY RNP ENTRY
(PEGASUS FMC)

The entered RNP value is greater than the default RNP value for the present flight phase or, less than the present Actual Navigation Performance.

VOR AAA INVALID

Signal is lost from remotely tuned VOR (AAA is the identifier for the VOR).

XXXXX

Altitude set in the MCP window when VNAV is engaged, the CLB or CRZ page is displayed, and the altitude is above, within 4000 feet below, and not equal to the CRZ ALT.

CDU Annunciator Lights

These annunciator lights illuminate when certain conditions exists.

DSPY

A flight plan modification is pending and the RTE, RTE LEGS, RTE DATA, or RTE HOLD page not containing the active leg or route segment is displayed, or a VNAV page (CLB, CRZ, or DES) not corresponding to the active VNAV mode is displayed.

FAIL

The associated FMC has failed.

OFST

An offset path has been entered and executed..

MSG

An FMC message is waiting to display or is displayed.

FCTM