737 Operations Manual
Performance Inflight -
Text
737-400/CFM56-3_23.5K
Copyright © The Boeing Company. See title page for details.
PI.26.6 D6-27370-400E-TBCE
Pitch attitude is shown in bold type for emphasis since altitude and/or
vertical speed indications may also be unreliable.
All Engines
Long Range Cruise Maximum Operating Altitude
These tables provide the maximum operating altitude in the same manner
as the FMC. Maximum altitudes are shown for a given cruise weight and
maneuver capability. This table considers both thrust and buffet limits,
providing the more limiting of the two. Any data that is thrust limited is
denoted by an asterisk and represents only a thrust limited condition in
level flight with 100 ft/min residual rate of climb. Flying above these
altitudes with sustained banks in excess of approximately 15° may cause
the airplane to lose speed and/or altitude.
Note that the altitudes shown in the table are limited to the maximum
certified altitude of 37000 ft.
Long Range Cruise Control
These tables provide target %N1, Long Range Cruise Mach number, IAS
and standard day fuel flow per engine for the airplane weight and pressure
altitude. As indicated by the shaded area, at optimum altitude .74M
approximates the Long Range Cruise Mach schedule.
Long Range Cruise Enroute Fuel and Time
Long Range Cruise Enroute Fuel and Time tables are provided to
determine remaining time and fuel required to destination. The data is
based on Long Range Cruise and .74M/250 KIAS descent. Tables are
presented for low altitudes and high altitudes.
To determine remaining fuel and time required, first enter the Ground to
Air Miles Conversion table to convert ground distance and enroute wind to
an equivalent still air distance for use with the Reference Fuel and Time
tables. Next, enter the Reference Fuel and Time Table with air distance
from the Ground to Air Miles Conversion Table and the desired altitude
and read Reference Fuel and Time Required. Lastly, enter the Fuel
Required Adjustment Table with the Reference Fuel and the actual weight
at checkpoint to obtain fuel required to destination.
Long Range Cruise Wind-Altitude Trade
Wind is a factor which may justify operations considerably below optimum
altitude. For example, a favorable wind component may have an effect on
ground speed which more than compensates for the loss in air range.
June 07, 2002
To Next Page
Loading...
