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annunciators indicates an advisory annunciation, amber annunciators indicate an alerting
annunciation.
GF1710_095
ANNUNCIATORS
DSPLY DR DGRAD MSG OFFSET APRCH
The annunciators are:
(Display) − is lit when the CDU displays:
· A flight plan page other than the first page of the active flight plan.
· A stored flight plan page.
· Any of the review pages for SIDs and STARs/approaches.
· A CHANGE ACTIVE LEG message.
· Defining an INTERCEPT waypoint on the active leg.
(Dead Reckoning) − is lit when operating in the DR mode for longer than 2 minutes. The DR
mode is defined as the loss of radio updating and all other position sensors.
DGRAD (Degraded) − is lit when the FMS cannot guarantee the position accuracy for the present
phase of flight due to sensor availability. If the DR annunciator is lit when DGRAD is lit, DGRAD
annunciator goes out. The annunciator is lit if both of the following conditions are valid:
· The sensors being used to navigate are not approved for the current phase of flight.
· A nonprecision
instrument approach (NDB, NDB/DME, VOR, VOR/DME, GPS, RNAV, or
DME/DME) is selected. If no approach, or an ILS, LOC, LOCBC,
LDA, SDF, or MLS
approach is selected, the APRCH annunciator does not light.
NAVIGATION
REV 41, Jul 08, 2004 Flight Crew Operating Manual
CSP 700−6
Volume 2
17−10−51
FLIGHT MANAGEMENT SYSTEM (FMS) (CONT'D)
Annunciators (Cont’d)
Flight Phase Approved sensors (Navigation Mode)
GPS DME/DME VOR/DME IRS
Departure or
Terminal
X X X (see note)
Enroute X X X X
Oceanic X X X X
VOR/DME or
VOR Approach
X X X −
GPS Approach X − − −
NBD Approach X X − −
NOTE:The FMS uses IRS as the navigation mode for a limited time in these phases of flight. The
time is determined in the FMS by estimating when the drift rate error of the IRS exceeds 1.7 NM
for departure and terminal operations.
MSG (Message) − is lit when a message is displayed in the scratchpad. Messages are displayed
in the CDU scratchpad to inform or alert the pilot as to the system status. The annunciator goes
out after the message(s) has been cleared from the scratchpad. For a list of FMS messages, refer
to the Flight Management System Pilot’s Guide. Messages are divided into two groups:
· Advisory messages − Contains information that is useful to the pilot. Are
usually the result of a pilot action on the CDU.
INVALID ENTRY
· Alerting messages − Alert the pilot to FMS status.
COMPARE FMS POSITIONS
If a graphic or video is currently displayed on the CDU−820 and a message appears, the CDU
display will immediately return to the FMS page and a message will be shown in the scratchpad.
NAVIGATION
Flight Crew Operating Manual REV 41, Jul 08, 2004
CSP 700−6
Volume 2
17−10−52
FLIGHT MANAGEMENT SYSTEM (FMS) (CONT'D)
Annunciators (Cont’d)
Effectivity:
· Airplanes 9002, 9004 thru 9124 not incorporating Service Bulletin:
· SB 700−34−025, Navigation − Introduction of FMS CDU−820.
MSG (Message) − is lit when a message is displayed in the scratchpad. Messages are displayed
in the CDU scratchpad to inform or alert the pilot as to the system status. The annunciator goes
out after the message(s) has been cleared from the scratchpad. For a list of FMS messages,
refer to the Flight Management System Pilot’s Guide. Messages are divided into two groups:
· Advisory messages − Contains information that is useful to the pilot. Are usually
the result of a pilot action on the CDU.
INVALID ENTRY
· Alerting messages − Alert the pilot to FMS status.
COMPARE FMS POSITIONS
OFFSET (Offset) − is lit when a lateral offset has been entered on PROGRESS page. The annunciator
goes out when the offset is removed.
APRCH (Approach) − indicates that FMS is in approach mode of operation. In this mode, the EFIS
deviation sensitivity and FMS tacking gains are increased. APRCH is lit when the following
conditions are valid:
· FMS is selected navigation source on EFIS.
· A nonprecision
instrument approach is selected
· The airplane position is between 2 NM outside the Final Approach Fix (FAF) and the Missed
Approach Point (MAP).
· The DGRAD annunciator must not be displayed.
· The FMS must be using approved sensors for the selected approach procedure (VOR, VOR
DME, NDB, GPS).
NAVIGATION
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