FLT 4.1.1 The Operator shall have a process, performed by Operations Engineering, to determine and maintain guidance, procedures and performance data in the OM, applicable to each aircraft type, for applicable departure, destination and alternate airports. Such guidance and data shall enable the flight crew to determine or compute:(i) Maximum structural weights (taxi, takeoff, landing);(ii) Takeoff performance (accelerate - stop, close-in obstacles) that also ensures charting accuracy is accounted for, when necessary, in assessing takeoff performance in the event of a critical power unit failing at any point in the takeoff;(iii) Maximum brake energy and minimum cooling time;(iv) Climb performance (distant obstacles);(v) Landing performance (minimum landing distance, go-around). (GM) "