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ANALYSIS: Why there was more to the HS Trident than just a lot of noise

The introduction of ICAO Annex 16 Chapter 2 noise legislation on 1 January 1986 forced operators of older first- and second-generation jets to hush kit their fleets. For British Airways, this was not a viable option for its fleet of Hawker Siddeley HS 121 Tridents – not that it needed an excuse to phase out these fuel-thirsty geriatric jets.

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