NEW APPROACH TO AIRPORT LIGHTING INSPECTION.

Experimental work with an airborne Vinten Reconaissance Camera Type 360 revealed that the camera will record approach and runway lighting satisfactorily in daylight conditions at 100% brilliancy, and that it will also photograph systems at night at the required settings for night operations. By selecting a continuous run of photographs at 0. 5 second intervals and descending through the glide path from, say, two dots up to two dots down, the exposures will straddle the VASIS signals from white/white to red/red and give a very accurate recording of the system. Discrepancies in balance between various VASI boxes can be indicated to the maintenance engineers by selecting suitable photographs at the point of colour change.