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sensor.
IRS 1-2 HI LAT
ALN
IRS is in
alignment
status and
senses a
latitude above
70°.
1. Use IRS position with caution,
accuracy may be degraded.
2. IRS's should be left in ALIGN
mode for 15 minutes prior to
selecting NAV mode.
Quick Reference Handbook
MESSAGES AND ANNUNCIATIONS REVISION 7
Page MC - 12 May 30/02
Advisory (Blue) Messages and Annunciations, ctd… AFM 3B
Message: Cause(s): Corrective Action:
IRS
MISCOMPARE
FGC has
detected an
unflagged
miscompare
fault between
IRS 1/2.
1. If there is no IRS MONITOR
FAIL message FGC will
automatically vote either IRS 1
or IRS 2 and AP / YD will
remain engaged.
2. If there is IRS MONITOR FAIL
message present, the AP / YD
will automatically disconnect.
3. Re-engagement is possible
only after miscompare
condition is corrected.
IRS MONITOR
FAIL
FGC has
detected failure
of comparison
monitor located
in AHRS / IRS
3.
1. AHRS / IRS 3 must be in NAV
mode when YD is engaged for
monitor test to pass.
2. If message is present and
unflagged IRS miscompare
occurs, AP / YD will
disconnect.
3.To eliminate message, switch
from current FGC to opposite
FGC and back, e.g., FGC 1 to
FGC 2 to FGC 1.
IRS 1-2 NAV
READY
Indicated IRS
has completed
alignment but
MSU panel
selector is still
in ALIGN.
Select NAV on MSU panel
selector.
IRS 1-2 ON DC Airplane AC
power supply
has failed.
1. Check appropriate airplane AC
power supply.
2. IRS will continue to operate
normally.
ISOLATION VLV
OPEN
Isolation valve
is open.
Select isolation valve CLOSED.
MAINT SWITCH
ON
Maintenance
switch is on.
Select maintenance switch off
(located in each avionics rack).
Quick Reference Handbook
REVISION 7 MESSAGES AND ANNUNCIATIONS
May 30/02 Page MC - 13
Advisory (Blue) Messages and Annunciations, ctd… AFM 3B
Message: Cause(s): Corrective Action:
NAV MISCOMP
L-R SEL
FGC has
sensed
difference in
navigation
receiver
information and
selected a
single receiver
as NAV source.
None. Switchover is automatic.
NOTE: Message is active only in
ILS dual coupled mode.
NZ 1-2 FAIL Indicated
navigation
computer has
failed.
1. Check appropriate CB (CP: D-
8, E-8.)
2. Associated FMS CDU will be
blank or display PERF INDEX.
OIL FILT BPASS,
L-R
Engine oil filter
has clogged.
1. Monitor engine oil pressure.
2. If pressure falls below limits,
see Engine Failure / Shutdown
In Flight, page EC-6.
PERF 1-2 FAIL Indicated
performance
computer has
failed.
1. Check appropriate CB (CPO:
C-11, D-11.)
2. Performance information and
autothrottle computer will not
be available.
PROG MSG 1-2
FAIL
(SPZ 8400 equipped)
Programmable
message
modules have
failed.
Notify maintenance for corrective
action.
PROG MSG 1-2
MISMATCH
(SPZ 8400 equipped)
Programmable
message
modules do not
contain same
messages.
Notify maintenance for corrective
action.
RAD ALT 1-2 FAIL Radar altimeter
has failed.
Select opposite radar altimeter.
RECENTER TURN
KNOB
TURN knob is
not centered.
Autopilot
cannot be
engaged.
Recenter TURN knob.
RUDDER LIMIT Rudder
actuator torque
limiter is in
operation.
None.
Quick Reference Handbook
MESSAGES AND ANNUNCIATIONS REVISION 7
Page MC - 14 May 30/02
Advisory (Blue) Messages and Annunciations, ctd… AFM 3B
Message: Cause(s): Corrective Action:
RUDDER STRG
OFF
With ASC 302A
installed HAND
WHEEL ONLY
is selected.
None required if this is desired
mode. If not, select NORMAL
mode.
SELECT INHIBIT An attempt is
made to
manually select
invalid FGC.
Determine cause of FGC fault.
SERVICE DOORS One or more of
service doors is
open.
Close service doors.
SG 1-2-3 FAIL Indicated
symbol
generator has
failed.
Switch appropriate symbol
generator to "ALT" and
momentarily select a different
mode on the navigation display.
SG 1-2-3 HOT Symbol
generator hot.
1. Check avionics rack ventilation.
　
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