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in active flight plan.
Clear the message and amend
the entry.
NOT ON INTERCEPT
HEADING
Aircraft is not within the
LNAV capture criteria for the
active leg (LNAV
disengages).
Manually place the aircraft on an
intercept heading and reengage
LNAV.
OFFSET DELETED The entered start waypoint
has been deleted from the
flight plan.
Clear the message and amend
the route.
OFST ENDS ABEAM
XXXXXX
An invalid offset leg exists
between the end waypoint
(XXXXXX) and the start of
offset or no end waypoint
exists.
Clear the message and amend
the route.
PROGRAM PIN ERROR FMC connector wiring is
incorrect.
System unusable; advise
maintenance personnel. The
CLR key will not clear the
message.
RESET MCP ALT FMC operation cannot take
aircraft away from the AFDS
MCP altitude.
Select a MCP altitude value in
the proper direction (higher for
climb, lower for descent).
ROUTE FULL Entry of more than maximum
allowed number of waypoints
or holding patterns attempted.
Clear the message and review
existing and desired waypoints
and holding patterns for
possible deletion.
RUNWAY N/A FOR SID The selected runway is not
applicable to the selected
departure procedure.
Clear the message and check
selections on the
DEPARTURES page. Modify
as required.
SELECT ACTIVE
WPT/LEG
Power–up restart or insertion
of a different flight plan while
airborne.
EXECute a direct–to or leg
intercept to tell the FMC which
leg of the route is active.
STEEP DESCENT AFTER
XXXXXX
An excessive vertical
discontinuity exists after point
XXXXXX.
Check routing.
TAI ON ABOVE 10°C Aircraft is operating with antiicing
with TAT above +10°C.
Clear the message and check
the use of anti–icing for engines
and/or wings.
FLT MGMT, NAV
Sec. 2.11 Page 6
Rev. 11/15/02 #41
Continental
737
Flight Manual
ADVISORY MESSAGE CAUSE CORRECTIVE ACTION
UNABLE CRZ ALT FMC predicts that the aircraft
cannot reach the new CRZ
ALT due to performance
limitations.
Or
FMC predicts that no cruise
time is possible at the entered
CRZ ALT.
Clear the message and review
the CRZ ALT selection.
UNABLE MACH .XXX The entered cruise mach is
unattainable based on
present gross weight.
Select a smaller mach number
or wait until gross weight is
reduced sufficiently.
UNABLE TO OFFSET A valid offset cannot be
constructed due to geometric
limitations.
Clear the message and amend
the route.
USING RSV FUEL Predicted fuel remaining at
DEST is less than the
RESERVES entry on the
PERF INIT page. May be the
result of an inoperative fuel
quantity indicator.
Clear the message and change
routing if required.
Use manual computations of
fuel quantity remaining to
determine gross weight.
VERIFY GW AND FUEL Fuel flow data becomes
invalid after engine start and
fuel value is replaced with
dashes.
Enter fuel weight on PERF INIT
page 1/2. Periodic update of
fuel weight is required to keep
gross weight value current.
VERIFY RNP VALUE When entering an RNP the
underlying RNP value is
smaller than the manually
entered value or the ANP is
greater than the manually
entered RNP.
Change or delete the manually
entered RNP.
XXXX (airport identifier) A REF AIRPORT is entered
on the POS INIT page and no
entry of ORIGIN yet appears
on RTE page 1.
Enter the airport identifier on the
ORIGIN data line.
XXXXX (MCP altitude value) In cruise, resetting the AFDS
MCP altitude to a value
different from the CRZ ALT
causes the value to appear in
the scratch pad.
Enter the MCP altitude value on
the appropriate target altitude
data line.
737
Flight Manual
Continental
FLT MGMT, NAV
Sec. 2.11 Page 7
Rev. 11/15/02 #41
FMC/CDU ALERTING MESSAGES
These messages relate to operationally significant conditions which affect
FMC/CDU operation. This is a general list: some messages may not apply to all
FMC configurations. The amber FMC ALERT light on each pilot’s instrument
panel illuminates whenever an alerting message is displayed in the CDU scratch
pad. The white CDU MSG light also illuminates. Some messages will displace an
existing scratch pad entry and are displayed immediately when generated. Other
messages will not be displayed until the scratch pad has been cleared; however,
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