HONEYWELL SYSTEMS AND RESEARCH CENTER MINNEAPOLIS MN
The Hot LineHelmet Display flight test demonstrated that the concept of using the Helmet Mounted SightDisplay HMSD for a gunsight is feasible and can be considered as an alternate display if the conventional Head-Up Display HUD is not available. The flight test again demonstrated that the Hot Line Gun Sight HLGS is a viable gunsight concept. This demonstration is based on limited flight test data, including five firing missions flown, which resulted in two FIGAT targets shot down. When compared with the conventional HUD, some advantages are obtained including 1 greater translational flexibility to see around obstacles 2 greater vertical field of view and 3 HMSD available for other weapon delivery and avionics purposes. These advantages are offset by some disadvantages that include 1 limited eye relief and HMD cable mass imbalance can cause loss of display under high g due to helmet shift on the pilots head 2 shift in sight alignment of generally less than or - 3 mils due to transformation errors from various sources is disconcerting but probably consistent with the overall sighting error budget for the system 3 sight accuracy is dependent on the quality of the pilots boresight prior to use and 4 cabling to helmet is not as reliable as stationary aircraft cabling.