Night flying activity can give local residents cause for concern but this is routine activity and a yearly occurrence to calibrate the runway.
FROM RAF Northolt:
“There will be night flying on 19 and 20 Oct during the period 2200 to 0600 on both nights. This is essential flight checking activity in order to calibrate the Instrument Landing System (ILS) and Precision Approach Radar (PAR). Multiple approaches will be flown to both runways in order to assure the safety of the stn’s Navigat