737 MAX Flight Crew Operations Manual
Flight Management, Navigation -
FMC Messages
11.60.12
MN-FLT-OH-201
ALERTING MESSAGE
CAUSE
CORRECTIVE ACTION
TAKEOFF SPEEDS
DELETED
A change to runway,
runway data, takeoff
thrust selection or
performance data is
made after the V speeds
have been selected, or
entered V speeds fail to
meet relative value
check.
A check, after first
engine start, of entered
OAT versus sensed OAT
has a difference of +/- 6
degrees Celsius.
Reselect new V speeds
and clear message.
Enter updated/corrected
OAT on the N1 LIMITS
page, then reselect new
V speeds and clear
message.
THRUST REQUIRED
Airplane is in an
underspeed condition.
Clear the message.
Increase airspeed to
within 15 knots of speed
target.
UNABLE HOLD
AIRSPACE
The lateral predicted
hold path using the bank
angle limit causes
protected airspace to be
exceeded.
Review the holding
pattern. If holding
pattern exceeds
allowable holding
airspace, consider flight
plan change.
UNABLE NEXT
ALTITUDE
Unable to meet the next
flight plan altitude
constraint in a VNAV
climb or descent. The
message appears only
with VNAV engaged.
Clear the message and
review the prediction.
For undershoot condition
during climb, consider
selection of MAX RATE
CLB or MAX ANGLE
CLB, or a different N1
limit as appropriate.
UNABLE PROC
AIRSPACE
Minimum procedure turn
built by guidance
exceeds the allowable
excursion distance.
Modify flight plan as
required.
Clear the message.
March 1, 2021
