LNAS - A PILOT ASSISTANCE SYSTEM FOR LOW-NOISE APPROACHES WITH MINIMAL FUEL CONSUMPTION

Abstract

Landing is one of the most labor-intensive flight phases. In order to help pilots with the complex handling procedures for a low-noise approach, DLR has developed the LNAS (Low Noise Augmentation System) pilot assistance system. This system shows exactly to the pilot when to perform which pilot action via a display in the cockpit. This display on the Electronic Flight Bag (EFB), which can be intuitively and instantly grasped, thanks to its simple representation, is used as a long-term planning basis for the entire approach. The optimal approach profile is divided into different phases. The optimum times for setting flaps and extending landing gear are each marked in the approach profile. If the pilot follows these instructions, the approach can be implemented with minimum thrust from cruising altitude to the stabilization height of 1000 feet above ground level. Therefore the lowest possible noise development and lowest possible fuel consumption can be achieved. In 2016, the LNAS pilot assistance system successfully completed initial flight tests during everyday peak-time operation at Frankfurt Airport. A total of 74 approaches were implemented on board the DLR A320 ATRA (Advanced Technology Research Aircraft) in five test series. The assistance system was of great help to the pilots, especially in difficult situations, such as strong tailwinds or speed restrictions from air traffic control. For long-term testing, Deutsche Lufthansa is currently equipping up to 86 aircraft of the A320 family with the assistance system LNAS developed by DLR. First, software integration and integration flights were successfully completed. Currently, a group of selected Lufthansa pilots are using the LNAS assistance system for pre-trial testing in regular flight operations during approaches. As soon as all conditions have been met, the test will be extended to all Lufthansa A320 pilots.