737 Operations Manual
Performance Inflight -
Text
737-500/CFM56-3_20K
Copyright © The Boeing Company. See title page for details.
PI.36.6 D6-27370-400E-TBCE
Flight with Unreliable Airspeed / Turbulent Air Penetration
Pitch attitude and average %N1 information is provided for use in all
phases of flight in the event of unreliable airspeed/Mach indications
resulting from blocking or freezing of the pitot system. Loss of radome or
turbulent air may also cause unreliable airspeed/Mach indications. The
cruise table in this section may also be used for turbulent air penetration.
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
December 06, 2002
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