This work consist of a study on the noise generated by a jet at the vicinity of a wing, whose geometry is simplified as a flat plate. Two formulations for the evaluation of the acoustic field of the problem are presented. The first formulation considers a semi-infinite flat plate and allows the study the influence of the incidence angle in noise radiation by installed jets. The second uses a Boundary Element Method (BEM) to consider a finite plate with different geometries; in this formulation, we analyse both incidence angle and deflection angle for bent plates, being representative of the deflection of a plane flap. In both cases, the sound sources of a turbulent jet are based on a kinematic model, semi-empirical, in the shape of a wavepacket with parameters adjusted using experimental data. The results show a signicant reduction for the noise radiated towards the ground due to the change of the polar acoustic directivity with the increase of the angle between trailing edge and jet axis. This trend remains for both finite flat and bent plates, showing a promising direction for noise reduction of aircrafts in strategic regions. After that, an improvement of the sound source, previously considered as a semi empirical wavepacket, was performed by exchanging it for linear PSE solutions, which are based on a linearisation of the Navier- Stokes equations and avoid thus the empiricism of the previous approach. The calculation reproduces the main trends expected for this case, such as the superdirectivity at low polar angles for the free jet and the cardioid shape of the acoustic field for the installed jet. We first study the influence of the radial distance between jet and plate, considering that this analysis is only weakly dependent on the two-point coherence of the source. After that analysis, the influence of coeherence was evaluated by including the experimental values of the coherence length in the Cross-Spectral Density (CSD) of the source using available experimental data. Results shows that the inclusion of coherence in this model generally recovers the acoustic field, giving an evidence that this parameter might be the missing part for acoustic prediction using reduced order models. This work will lead to a more reliable tool, based on first principles, to study the characteristics of the sound generated by a jet near a trailing edge.