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SOURDINE I I Report Summary

Project ID: 11011
Funded under: FP5-GROWTH
Country: Spain

Innovative arrival and departure abatement procedures

Procedure design process:
The project started with the generation of an overview of current practices and future technology related to the environmental friendly approach and departure procedures. Based on those results and after feedback from an international expert panel a first set of potential procedures was developed. Those procedures were assessed using single event simulations (SES) with Airbus aircraft performance and noise calculation tools. Aircraft included in the study are the short/medium-range twinjet A320-200 and the long-range, four-engines A340-300. The performance studies involved computation of operational trajectories based on the procedure descriptions. These studies enable a first selection of the initial procedures based on aircraft performance limitations and provide trajectories that reflect performance characteristics and limitations of the aircraft. The trajectories are used as input for single event noise prediction carried out with Airbus Noise Level Calculation Program (NLCP).

This assessment led to the selection process where 5 approach and 3 departure procedures were selected to be further assessed in detail during the project.

Description of the 8 Operational flight procedures (including two baselines):
Brief description of Approach procedures:
- Procedure I: Baseline FMS approach procedure: This procedure has a standard vertical flight path, with a level segment at 3000ft, during this last part of the flight path deceleration is performed, making this procedure quite competitive and better than standard approach procedures.
- Procedure II: Basic CDA with 2º initial FPA: this procedure follows a fixed 2-degrees path angle from 7000ft up to ILS intercept at 3000ft.The aircraft decelerates at idle thrust in clean configuration during this part of the flight, deploying the cleanest possible landing configuration on landing.
- Procedure III: Basic CDA with 2º initial FPA and increased final glideslope: the difference between procedure II and procedure III is the steeper flight path angle (4º instead of 3º for all other approach procedures) on the ILS.
- Procedure IV: CDA with constant speed, variable FPA segment at landing configuration: the procedure is largely flown, from 7000ft to ILS intercept, with idle thrust and in landing configuration.
- Procedure V: CDA with constant speed, variable FPA segment at intermediate configuration: the procedure is similar to procedure nº IV, with the difference that the variable FP is the result of an idle thrust descent from 7000ft to ILS intercept on an intermediate configuration.

Brief description of Departure Procedures
- Procedure 1: Baseline take-off procedure: this is the baseline departure procedure (NAP ICAO-A)
- Procedure 2: Sourdine optimised close-in: this is the closein departure procedure, for which the noise relief is located relatively close to the runway. The procedure is distinguished by a deep cutback in thrust, followed by a gradual increase in thrust starting at 3000ft [D3-1-2].
- Procedure 3: Sourdine optimised distant: this is the distant departure procedure, same as for the previous one with the difference that the noise relief is further away from the runway. Again the procedure is distinguished by a deep cutback in thrust but on reaching zero flap speed (Vzf), followed by a gradual thrust increase starting at 5000ft [D3-1-2].

Reported by

Ingenieria y Economia del transporte (INECO)
Avda. del Partenon, 4 ē 4º Planta
28042 Madrid
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