737 Flight Crew Operations Manual
Performance Inflight
Text
737-800WSFP1/CFM56-7B26
FAA
Category C/N Brakes
Boeing Proprietary. Copyright © Boeing. May be subject to export restrictions under EAR. See title page for details.
D6-27370-866-EGP PI.17.13
Operation with derate and/or assumed temperature reduced thrust is not
permitted with the EEC in alternate mode.
Limit Weight
A simplified method which conservatively accounts for the effects of EEC
in alternate mode is to reduce the normal mode (ON EEC switch
illuminated) performance limited weights. The Limit Weight table
provides takeoff field, climb, obstacle, tire speed and brake energy limit
weights. To determine limit weights for operations with the EEC in the
alternate mode, enter the table with the limit weights for normal mode EEC
operation and read the associated limit weight for each performance
condition. The most limiting of the takeoff weights must be used. Analysis
from the Airplane Flight Manual - Digital Performance Information may
yield less restrictive limit weights.
Takeoff Speed Adjustment
Takeoff speeds for the reduced weight should be increased by the amount
shown in the Takeoff Speeds Adjustment table. The adjusted V1 should not
exceed the adjusted VR.
Note: The FMC does not incorporate alternate mode EEC performance in
its takeoff speeds calculations.
Max Takeoff %N1
The alternate mode EEC thrust schedule provides equal or greater thrust
than the normal mode thrust for the same thrust lever position. Thrust limit
protection is not provided in alternate mode EEC and maximum rated
thrust may be reached at thrust lever position less than full forward. As a
result, thrust overboost may occur if the target alternate mode EEC Max
Takeoff %N1 settings are not observed.
To find alternate mode EEC Max Takeoff %N1 based on normal engine
bleed for air conditioning packs on, enter the Alternate Mode EEC Max
Takeoff %N1 table with airport pressure altitude and airport OAT and read
%N1. For packs off apply the %N1 adjustment provided below the table.
No %N1 adjustment is required for engine or wing anti-ice.
September 15, 2016
To Next Page
Loading...
