Operators of a specific set of Sukhoi Superjet 100s are being instructed to check the security of passenger windows on the twinjet type after discovery of a fastener manufacturing defect.

Inspection of two Aeroflot aircraft found loosened and defective screws which clamp passenger windows.

Damage to their threads had resulted from use of a sharp tool, says Russian federal air transport regulator Rosaviatsia, a “violation” of installation procedures.

It has proposed examination of 15 other specific Superjets – with serial numbers between 95037 and 95084 – to ensure “absence of play” between components of the passenger windows.

These checks must be carried out after 750h or 100 days, and repeated at similar intervals until the aircraft reaches 7,500h or 6,000 cycles, at which point the window fasteners must be replaced.

Source: Cirium Dashboard