In order to supply all required data in a simple way and also take advantage of the MD-11 flaps flexibility for takeoff, Flight Operations Department prepares an operational data manual that includes a series of airport analyses based on Optimum Takeoff Flap.
All weights presented in the Optimum Flap format are the highest takeoff weights at any given set of runway and operating condition. Performance data is based on the takeoff flap setting that allows the highest second segment limiting weight without exceeding the runway length available, and all related speeds (V1, Vr, V2, etc) are presented too. Therefore, pilots only need to consult that manual prior to departure setting the FMC, dial-a-flap and flap position handle in accordance with the prepared performance data table.
Takeoff deflected ailerons were implemented during A1 Performance Improvement Program. In 1991, MDC came up with a drag reduction program to be implemented in 3 phases. A1 package 3 included an additional modification to the ailerons, enabling them to droop (to lean over) during takeoff. With the ailerons deflected a higher Maximum Takeoff Weight is permitted. For takeoff only, the neutral position of the aileron is 15 degrees trailing edge down on the outboard ailerons and 11.5 degrees trailing edge down on the inboard ailerons.
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