flight test engineer, and often visually displayed to the test pilot and/or flight test engineer using flight test instrumentation. Analysis and reporting It includes the analysis of a flight for certification. It analyze the internal and outer part of the flight by checking its all minute parts. Reporting includes the analyzed data result. Introduction Aircraft Performance has various missions such as Takeoff, Climb, Cruise, Acceleration, Deceleration, Descent, Landing and other Basic fighter maneuvers, etc.. After the flight testing, the aircraft has to be certified according to their regulations like FAA's FAR, EASA's Certification Specifications (CS) and India's Air Staff Compliance and Requirements. 1. Flight Performance Evaluation and documentation Flight data processing includes filtering, bias correction and resolution along flight path (Trajectory). Analysis of mission segments from the flight test data. Estimation of thrust using Performance Cycle Deck (PCD). Calculation of In-flight thrust using In-Flight Thrust Deck (IFTD). Documentation of Flight performance with standard procedures. Validation and updating of Aircraft performance model. 2. Reduction of Flight performance to standard conditions Model estimation of Aircraft Performance with International Standard Atmosphere conditions (ISA). Non-standard (tested) conditions are studied by incorporating standard mass, altitude, speed, throttle setting individually. The individual effects are added to the tested (non-standard) conditions to obtain the performance at International Standard Atmosphere conditions for Certification. For Takeoff and Landing, effect of Wind is considered too. 3. Preparation and Validation of Performance Charts for Operating Data Manual (ODM) Performance charts allow a pilot to predict the takeoff, climb, cruise, and landing performance of an aircraft. These charts, provided by the manufacturer, are included in the AFM/POH. Information the manufacturer provides on these charts has been gathered from test flights conducted in a new aircraft, under normal operating conditions while using average piloting skills, and with the aircraft and engine in good working order. Engineers record the flight data and create performance charts based on the behavior of the aircraft during the test flights. By using these performance charts, a pilot can determine the runway length needed to take off and land, the amount of fuel to be used during flight, and the time required to arrive at the destination. It is important to remember that the data from the charts will not be accurate if the aircraft is not in good working order or when operating under adverse conditions. Always consider the necessity to compensate for the performance numbers if the