§ Mr. Ingram
Uncommanded movements are defined as an unusual movement of flying controls or rotors that are not caused by pilot inputs.
The table lists the incidents of uncommanded flying control movements in Chinook helicopters since 1 January 1999 and their determined causes.
Uncommanded flying control movements in Chinook aircraft since 1999 Date Tail number Cause 1999 12 March ZA712 Faulty AFCS 17 March ZA718 Faulty DASH actuator and directional gyro 20 April ZD983 Directional gyro out of tolerance 29 April ZH775 Faulty AFCS and directional gyro 14 June ZA718 Faulty directional gyro 29 July ZA718 Faulty AFCS and directional gyro 29 October ZA711 Faulty directional gyro 18 November ZA711 Faulty directional gyro 2000 6 January ZA714 Faulty AFCS 6 January ZA718 Faulty AFCS 11 February ZA682 Faulty vertical gyro 4 April ZA682 Faulty DASH actuator gear assembly 5 April ZA679 Faulty DASH actuator 5 April ZA684 Faulty directional gyro connector
Uncommanded flying control movements in Chinook aircraft since 1999 Date Tail number Cause 30 May ZA710 Faulty AFCS 24 July ZA679 Faulty AFCS and DASH actuator 5 August ZA674 Faulty cables to AFCS 9 November ZA671 Faulty vertical gyro 12 November ZA671 Faulty AFCS 2001 17 January ZH777 Units replaced following pitch oscillations 1 March ZA709 Faulty directional gyro 1 May ZA674 Faulty directional gyro 24 May ZA680 Faulty lower control actuators 5 July ZD981 Faulty attitude indicator
§ Mr. Ingram
No such instances have occurred. Aircrew have retained full control of the aircraft whenever an uncommanded flying control movement has taken place by successfully mitigating the effects of the control movement.