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DIAL, in collaboration with key stakeholders, has implemented several noise mitigation measures, including modern fleets, optimized air traffic procedures and noise monitoring system. These efforts, such as promotion of quieter aircraft, quieter procedure, operational restrictions and land use planning help reduce noise impact and ensure corrective actions are taken when needed.
The maximum permissible noise levels (as unit Lmax) at Noise Monitoring Terminals for aircrafts operation is 105 dB (A) for Day time – from 0600 hrs. to 2200 hrs. and 95 dB (A) for night time – from 2200 hrs. to 0600 hrs. Further, Ambient Air Quality Standards with respect to Noise in Airport Noise Zone for busy airport in unit Leq is 70 dB (A) in day time and 65 dB (A) in night time.
Continuous Aircraft noise monitoring terminals (NMT’s) have been installed under the approach and departure funnels of all runways to measure and monitor the aircraft noise level. The NMT’s are recording the sound levels on real time basis. Noisy aircraft are being identified and communicated to airlines for creating awareness.
Mixed Mode Runway Use Plans is adopted to ensure that the aircraft operation is equitably distributed among the runway funnels and consequently the impact of noise is not localized to a particular area. This helps in reducing the effect of noise levels generated by aircrafts during landing and taking-off in the vicinity of IGI airport.
Continuous Descent Approach for aircraft landing at Delhi Airport has been adopted and is communicated through Aeronautical Information Publication (“AIP”). Continuous Descent Approach (“CDA”) is an aircraft operating procedure in which an arriving aircraft descends with minimum thrust and avoids step down flight to the extent permitted by the safe operation of the aircraft and compliance with published procedures and ATC. It results in to reduced noise and fuel consumption as compared to other conventional descents.
As a mitigation measure, operation of Chapter 2 Aircraft i.e. aircrafts with old noisy engines, restricting their landings during the period 2200 IST – 0600 IST at IGI airport. The airlines are also advised that ““consistent with safety of aircraft operations and in consideration of high intensity runway operations, pilots should minimize the use of, reverse thrust after landing to reduce disturbance in areas adjacent to the aerodrome.” Further, restricted usage of ground engine run-ups, APU/GPU has been implemented. Designated locations have been earmarked to perform ground engine run-ups. DIAL has provided Bridge Mounted Equipment comprising of Fixed Electrical Ground Power (FEGP) and Pre-Conditioned Air (PCA) at aerobridge to avoid usage of APU/GPU.
Aircraft Noise Complaint Redressal System has been established by DIAL to collect and address the community noise complaints due to aircraft operations with an automated telephone recording number 011-47198600.
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