GM3 SPO.IDE.A.146 Lightweight flight recorder

• ED Decision 2021/005/R found in: Air Operations (965/2012) Part-ARO Part-ORO Part-CAT Part-SPA Part-NCC Part-NCO Part-SPO (Sep 2023)

GM3 SPO.IDE.A.146 Lightweight flight recorder ED Decision 2021/005/R RECORDING ACCURACY OF ATTITUDE RATE PARAMETERS In the case of attitude rate parameters (pitch rate parameter, yaw rate parameter, roll rate parameter), the accuracy limit specified in EUROCAE Document ED-155, dated July 2009, was found to be unclear. Therefore, the following additional guidance is provided: (a) If the attitude rate parameter is provided by an approved system of the aeroplane, accuracy greater than as provided by this system is not expected for this attitude rate parameter. (b) If the attitude rate parameter is provided by a dedicated gyroscope, it is advisable that the gyroscope meets the following performance: (1) errors caused by linear accelerations less than ±3°/sec (equivalent to ±1% of 300°/sec recording range) for all combinations of parameter values and linear acceleration values in the respective ranges [-300°/sec; +300°/sec] and [-3g; +6g]; (2) errors caused by to temperature less than ±5°/sec for all combinations of parameter values and temperature values in the respective ranges [-300°/sec; +300°/sec] and [-40°C; +85°C]; (3) angular random walk of the gyroscope equal to or less than 2°/sqrt(hour); and (4) bias stability of the gyroscope significantly less than 360°/hour (for instance, 50°/hour). GM3 SPO.IDE.A.146 Lightweight flight recorder ED Decision 2021/005/R RECORDING ACCURACY OF ATTITUDE RATE PARAMETERS In the case of attitude rate parameters (pitch rate parameter, yaw rate parameter, roll rate parameter), the accuracy limit specified in EUROCAE Document ED-155, dated July 2009, was found to be unclear. Therefore, the following additional guidance is provided: (a) If the attitude rate parameter is provided by an approved system of the aeroplane, accuracy greater than as provided by this system is not expected for this attitude rate parameter. (b) If the attitude rate parameter is provided by a dedicated gyroscope, it is advisable that the gyroscope meets the following performance: (1) errors caused by linear accelerations less than ±3°/sec (equivalent to ±1% of 300°/sec recording range) for all combinations of parameter values and linear acceleration values in the respective ranges [-300°/sec; +300°/sec] and [-3g; +6g]; (2) errors caused by to temperature less than ±5°/sec for all combinations of parameter values and temperature values in the respective ranges [-300°/sec; +300°/sec] and [-40°C; +85°C]; (3) angular random walk of the gyroscope equal to or less than 2°/sqrt(hour); and (4) bias stability of the gyroscope significantly less than 360°/hour (for instance, 50°/hour). ##### GM3 SPO.IDE.A.146 Lightweight flight recorder *ED Decision 2021/005/R* **RECORDING ACCURACY OF ATTITUDE RATE PARAMETERS** In the case of attitude rate parameters (pitch rate parameter, yaw rate parameter, roll rate parameter), the accuracy limit specified in EUROCAE Document ED-155, dated July 2009, was found to be unclear. Therefore, the following additional guidance is provided: (a) If the attitude rate parameter is provided by an approved system of the aeroplane, accuracy greater than as provided by this system is not expected for this attitude rate parameter. (b) If the attitude rate parameter is provided by a dedicated gyroscope, it is advisable that the gyroscope meets the following performance: (1) errors caused by linear accelerations less than ±3°/sec (equivalent to ±1% of 300°/sec recording range) for all combinations of parameter values and linear acceleration values in the respective ranges [-300°/sec; +300°/sec] and [-3g; +6g]; (2) errors caused by to temperature less than ±5°/sec for all combinations of parameter values and temperature values in the respective ranges [-300°/sec; +300°/sec] and [-40°C; +85°C]; (3) angular random walk of the gyroscope equal to or less than 2°/sqrt(hour); and (4) bias stability of the gyroscope significantly less than 360°/hour (for instance, 50°/hour).