GB1007968A - Improvements in or relating to designated area instrument landing system - Google Patents

Abstract

1,007,968. Aircraft instruments. BELL AEROSPACE CORPORATION. June 15, 1962 [June 16, 1961], No. 23250/62. Heading B7W. [Also in Division H3-H5] A display of the three-dimensional position of a helicopter is provided on two C.R.T. displays, Figs. 2 and 3, the display of Fig. 2 representing the position data of the craft in the vertical plane, and the display of Fig. 3 representing the position data of the craft in the horizontal plane. In the display of Fig. 2, symbol 20 represents the vehicle on craft, indicating by its position in relation to lines 25 and 27, that the craft has a roll to starboard and is slightly climbing. Symbol 14 represents the cross-section of the desired flight path whilst the position of dot 16 with reference to the intersection of lines 25 and 27 indicates that, to get into the desired flight path, the craft must climb, and move to starboard. The distance between line 27 and line 24 represents the altitude of the craft. Dots 22 move along line 24 at a speed representing the lateral ground speed of the craft, whilst dots 26 move along line 25 at a speed representing the forward ground speed of the craft. In the display of Fig. 3, line 42 represents the direction of scan of the searching and tracking means, which line rotates during the searching mode, but locks on to the beacon when found, the beacon then being shown as dot 40. Circle 48, scribed on the C.R.T. face, represents the desired pre-flight altitude, whilst circle 46 represents the actual altitude of the craft. A bearing ring 38 is coupled to the compass and indicates the heading of the craft against index 36. Cyclic lines 44 indicate by their point of intersection the required correcting position of the cyclic stick. Where blind landing capabilities are not required a simpler mechanical indicator, Fig. 4 (not shown), may be used, indicating horizontal and vertical flight direction lines analogous to the cyclic flight direction lines 44, angular deviation of craft from the desired radial of beacon and altitude error. Indicator lights are provided indicating beacon lock on, glide slope intersection on low altitude warning, and a distance marker to operate at 2,000 feet from the beacon.