737 Flight Crew Operations Manual
Performance Inflight
Chapter PI
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Section 18
737-8/LEAP-1B27
FAA
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MN-FLT-OH-201
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Introduction
This chapter contains information to supplement performance data from
the Flight Management Computer (FMC). In addition, sufficient inflight
data is provided to complete a flight with the FMC inoperative. In the event
of conflict between data presented in this chapter and that contained in the
approved Airplane Flight Manual, the Flight Manual shall always take
precedence.
General
Takeoff Speeds
The speeds presented in the Takeoff Speeds table, as well as FMC
computed takeoff speeds, can be used for all performance conditions
except where adjustments must be made for anti-skid inoperative, thrust
reversers inoperative, improved climb, contaminated runway situations, or
brake energy limits.
V1 adjustments are not necessary for equal amounts of clearway and
stopway. V1 for takeoff limit weights based on unequal clearway and
stopway should be obtained from computerized takeoff speed calculations
for the specific takeoff conditions.
These speeds may be used for weights less than or equal to the performance
limited weight subject to the restrictions noted above.
The FMC will protect minimum control speeds by increasing V1, VR, and
V2 as required. However, the FMC will not compute takeoff speeds for
weights where the required speed increase exceeds the maximum certified
speed increase. This typically occurs at full rated thrust and light weights.
In this case, the message "V SPEEDS UNAVAILABLE" will appear on the
FMC scratchpad and the takeoff speed entries will be blank. In this
situation, manually verify takeoff speeds using an approved source of
takeoff performance information. Upon verifying takeoff speeds, takeoff is
permitted. When the selected takeoff speeds cannot be verified, the
options are to select a lower flap setting, select derate thrust and/or
increase airplane gross weight (e.g. add fuel). Selecting derate thrust is the
preferred method as this will reduce the minimum control speeds. Note that
the assumed temperature method will not help this condition as the
minimum control speeds are determined at the actual temperature and
therefore are not reduced by an assumed temperature selection.
October 26, 2021
