737 Operations Manual
Performance Inflight -
Text
737-400/CFM56-3_23.5K
Copyright © The Boeing Company. See title page for details.
D6-27370-400E-TBCE PI.26.5
Assumed Temperature Reduced Thrust
Regulations permit the use of up to 25% takeoff thrust reduction for
operation with assumed temperature reduced thrust. To find the maximum
allowable assumed temperature enter the top chart with airport pressure
altitude and OAT. Compare this temperature to that at which the airplane
is performance limited as determined from available takeoff performance
data. Next, enter the center table with airport pressure altitude and the
lower of the two temperatures previously determined to obtain a maximum
takeoff %N1. Do not use an assumed temperature less than the minimum
assumed temperature shown. Enter the %N1 Adjustment table with OAT
and the difference between the assumed and actual OAT to obtain a %N1
adjustment. Subtract the %N1 adjustment from the maximum takeoff %N1
found previously to determine the assumed temperature reduced thrust
%N1.
Takeoff with assumed temperature reduced thrust is not permitted when:
runway is contaminated with ice, slush, snow, or standing water; anti-skid
is inoperative; or PMC is off. Use of this procedure is not recommended if
potential windshear conditions exist.
Max Climb %N1
This table shows Max Climb %N1 for a 250 KIAS/280 KIAS/.74M climb
speed schedule, normal engine bleed for packs on (Auto) and anti-ice off.
Enter the table with airport pressure altitude and TAT and read %N1.
Apply the appropriate bleed setting %N1 adjustment shown below the
table. %N1 adjustments are shown for engine bleed to packs off operation,
packs high operation, and wing anti-ice on.
Go-around %N1
To find Max Go-around %N1 based on normal engine bleed for packs on
(Auto) and anti-ice off, enter the Go-around %N1 table with airport
pressure altitude and reported OAT or TAT and read %N1. Apply the
appropriate bleed setting %N1 adjustment shown below the table. %N1
adjustments are shown for engine bleed to packs off operation, packs high
operation, and wing anti-ice on.
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.
June 07, 2002
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