![]() ![]() For the purpose of computing take-off and landing weights the Issue 4: 8 December 2004 Amdt No. Corrected Effective Operational Length: A length of runway - including over-run - expressed in feet, corrected for slope, runway surface, and approaches, declared by CASA as usable for take-off or landing by a particular aeroplane. Developmental Air Service: An air service which due to the nature of operational and economic considerations, has been declared by CASA to be a developmental service. Declared Weights: Weights determined for the use of declared conditions for a particular aerodrome. Declared Conditions: Atmospheric temperature, pressure or density altitude conditions declared by CASA as acceptable for a particular aerodrome for the purpose of determining weight limitations for take-off or for landing. Forecast Conditions: Atmospheric temperature and pressure conditions forecast for the aerodrome of destination, and its alternate if applicable, by an authorised meteorological officer within: (a) 1 hour of the time of take-off of the aeroplane engaged on a flight within Australian Territory and (b) 2 hours of the time of take-off of an aeroplane engaged on an international flight and used for the purpose of determining weight limitations of that aeroplane for landing at that aerodrome on that flight. During flight operations pilots can have a DA chart. 3 DEFINITIONS Ambient Conditions: Atmospheric temperature, pressure and wind conditions prevailing at a particular aerodrome during the period of 15 minutes preceding the take-off of the aeroplane. With elements of pressure, elevation, humidity and temperature considered, density altitude is computed. Use the table on the right to adjust for the difference between standard pressure and pressure at the airport. Here’s how: Adjust for field elevation using numbers on the right side of the chart. ![]() CIVIL AVIATION ORDERS PART 20 AEROPLANE WEIGHT LIMITATIONS - GENERAL SECTION 20.7.0 Issue 4 SUBSECTIONS 2 Application 3 Definitions 4 Declared Density Altitude Charts Appendixes I, II and III 2 APPLICATION This section applies to aeroplanes engaged in private, aerial work, charter and regular public transport operations. Using a Density Altitude Chart If you don’t have an E6B flight computer, it’s easy to determine the density altitude by using a density altitude chart. ![]()
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