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AUSA 2019: Defiant delays return to haunt SB>1

15th October 2019 - 17:12 GMT | by Tim Martin in Washington DC


The SB>1 Defiant programme has been hit by a delay of two months following a precautionary step to modify a main gearbox joint on a propulsion system test bed (PSTB).

Used to inform SB>1 demonstrator flight testing targets and performance mainly through speed, lift and load assessments, the test bed is a critical part of the Defiant effort and had been expected to support an objective of achieving 115 hours of flight tests before the end of 2019.

Those plans have now been thrown out by Sikorsky and Boeing as the JV have confirmed that completing flight envelope expansion has

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Tim Martin


Tim Martin

Tim Martin is Air Editor for Shephard Media, based in Belfast. 

Tim has experience writing …

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