Method and device of calculating aircraft braking friction and other relating landing performance parameters based on the data received from aircraft's on board flight data management system
This invention relates to a method and apparatus for the calculation of aircraft braking friction and other relating landing parameters, including but not limited to aircraft braking action, aircraft takeoff distance, aircraft landing distance, runway surface conditions and runway surface friction based on the data collected by and available in the aircraft Flight Data Recorder (FDR) or other flight data management system, for example, the Quick Access Recorder (QAR), to provide all involved personnel in the ground operations of an airport and airline operations, including but not limited to aircraft pilots, airline operation officers and airline managers as well as airport operators, managers and maintenance crews, with the most accurate and most recent information on the true aircraft landing performance parameters to help better and more accurate safety and economical decision making.
1. A method of calculating a true aircraft cornering friction coefficient of an aircraft runway or an aircraft taxiway, using an aircraft, comprising the steps of:
(A) Obtaining one or more sets of data points recorded on an aircraft flight data management system mounted on the aircraft, wherein the aircraft is proceeding or has proceeded on the aircraft runway or on the aircraft taxiway, wherein the one or more sets of the data points that were obtained from the aircraft's flight data management system include one or more sets of data points recorded on the aircraft's flight data management system substantially between a predetermined start time until a predetermined finish time thereafter, and wherein the one or more sets of the data points obtained from the aircraft's flight data management system include one or more sets of data points relating to one or more of the aircraft's following properties: aircraft ground speed, aircraft brake pressure, aircraft longitudinal acceleration, aircraft engine thrust setting, aircraft reverse thrust setting, aircraft engine revolutions per minute, aircraft air speed, aircraft vertical acceleration, aircraft spoiler setting, aircraft airbrake setting, aircraft aileron setting, aircraft flap configuration, aircraft pitch, and aircraft autobrake setting;
(B) Obtaining one or more sets of data points relating to one or more environmental parameters measured substantially in the vicinity where the aircraft is proceeding or has proceeded on the aircraft runway or on the aircraft taxiway, wherein the one or more sets of the data points relating to the one or more environmental parameters are measured substantially between the predetermined start time until the predetermined finish time thereafter, and wherein the one or more sets of the data points relating to the environmental parameters that were obtained relate to one or more environmental parameters chosen from the following group: air temperature, air pressure, relative humidity, wind speed, wind direction, pressure altitude, and aircraft landing surface elevation;
(C) Obtaining one or more sets of data points relating to one or more aircraft parameters pertaining to the aircraft that is proceeding or has proceeded on the aircraft runway or on the aircraft taxiway, wherein the one or more sets of the data points relating to the one or more aircraft parameters that were obtained relate to one or more aircraft parameters chosen from the following group: aircraft mass, aircraft engine type, number of aircraft engines, aircraft tire type, and aircraft type;
(D) Transmitting to a computer: (i) the one or more sets of the data points obtained from the aircraft's flight data management system, (ii) the one or more sets of the data points relating to the environmental parameters that were obtained, and (iii) the one or more sets of data points relating to aircraft parameters pertaining to the aircraft that were obtained; and
(E) Using the computer to calculate the true aircraft cornering friction coefficient of the aircraft surface: (i) using at least one of the one or more sets of the data points transmitted from the aircraft's flight data management system to the computer, (ii) using at least one of the one or more sets of the data points relating to environmental parameters transmitted to the computer, and (iii) using at least one of the one or more sets of the data points relating to aircraft parameters pertaining to the aircraft transmitted to the computer.
2. The method of calculating the true aircraft cornering friction coefficient of the aircraft surface using the aircraft of claim 1 wherein:
(A) The predetermined start time is when the aircraft begins taxiing prior to takeoff; and
(B) The predetermined finish time is when the aircraft takes off from the aircraft runway.
3. The method of calculating the true aircraft cornering friction coefficient of the aircraft surface using the aircraft of claim 2 wherein:
(A) The predetermined start time is when the aircraft touches down on the aircraft runway during landing of the aircraft; and
(B) The predetermined finish time is when the aircraft completes taxiing following landing.