AP-3C A9-660 on approach to Amberley on 11 August 2017. Apart from some additional antennae, the most noticeable feature of this aeroplane is the lack of sonobuoy launching tubes on the underside of the fuselage immediately aft of the wing. A9-660 and the similarly configured A9-657 are expected to remain in service until 2023. Picture: Lance Broad