Getting to Grips with Aircraft Noise

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7 - INFLUENCE FACTORS 7.4. TEMPERATURE INFLUENCE There is no simple rule regarding temperature influence. Indeed, the temperature impacts the aircraft thrust, and when it is greater than the corner point (i.e. the temperature at which the engine thrust becomes limited by the EGT constraint), this significantly lowers the aircraft trajectory. It also affects the noise absorption (as mentioned above). That means that depending on the mike location, the temperature may impact the perceived noise differently. In the following graph, the noise level evolutions versus outside air temperature both include the thrust variations and the trajectory changes due to them, as well as the sound absorption variations. 44 Do not use for operational purpose This chart shows that the temperature influence on noise levels depends on the location at which they are perceived. For the close microphone, which is under the TOGA thrust influence, the levels increase again from ISA+30, which corresponds here to the TREF (corner point). Beyond that temperature, the thrust is EGT limited, which means a sharper decrease versus temperature, thus a flyover much closer to the ground, resulting in higher noise levels. Flight Operations Support & Line Assistance Getting to grips with aircraft noise
Flight Operations Support & Line Assistance Getting to grips with aircraft noise 8 - FLYING A NOISE ABATEMENT DEPARTURE PROCEDURE 8. FLYING A NOISE ABATEMENT DEPARTURE PROCEDURE 8.1. BACKGROUND When a specific noise abatement procedure has to be applied during normal take-off (namely NADP), it is worth accurately storing the information describing it in the FMS. This is done to reduce pilot workload in the cockpit, thereby getting the utmost level of flight safety. This section provides some guidance on how to fly a Noise Abatement Departure Procedure when established, for current FMS standards and the future FMS 2 release 1A. 8.2. FLIGHT MANAGEMENT GUIDANCE COMPUTER (FMGC) REMINDERS 8.2.1. FLIGHT MANAGEMENT AND GUIDANCE SYSTEM (FMGS) STANDARD 1 (SO-CALLED “LEGACY”) Each FMGC has its own database, one field of which contains customized and standard navigation data such as navaids, waypoints, airways, en-route information, holding patterns, airports, runways, procedures (SIDs/EOSIDs, STARs, etc.), company routes, fuel policy, alternates. The airline updates this part every 28 days in sync with the ARINC cycles, and is responsible for defining, acquiring, updating, loading, and using this data. The other field contains pilot-stored elements that enable the pilot to create 20 waypoints, 10 runways, 20 navaids, and 3 routes. 8.2.2. FLIGHT MANAGEMENT AND GUIDANCE SYSTEM (FMGS) STANDARD 2 (SO-CALLED “PEGASUS”): FLY-BY- WIRE ONLY Each FMGC contains these main databases: 1. The Navigation database contains standard navigation data: navaids, waypoints, airways, en-route information, holding patterns, airports, runways, procedures (SIDs/EOSIDs, STARs, etc.), company routes, alternates. The airline updates this part every 28 days, and is responsible for defining, acquiring, updating, loading, and using this data. 2. The Airline Modifiable Information (AMI, also referred to as the FM Airline Configuration file) contains, amongst others the airline policy values such as the THR RED altitude, ACC altitude, EO ACC altitude. 3. The Aircraft Performance database, which comprises the Engine model, the aero dynamical model, and the Performance model. The airline cannot modify this database. 4. The Magnetic Variation database. In addition, each FMGC contains pilot-stored elements that enable the pilot to create 20 waypoints, 10 runways, 20 navaids, and 5 routes. 45
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