landing phase. The study was carried out by means of an all-digital simulation that was chiefly concerned with investigating the effects of gusts and wind shears on aircraft control near the ground. The performance of the automatic control system operating in turbulence was determined by a Monte Carlo technique. With respect to the digital control system, it was found that (1) the basic analog flare mode could be modified to improve its performance under conditions of turbulence and wind shear; (2) for most control modes the computation rate requirement is surprisingly low as indicated by the effects of computer repetition rate on the aircraft performance: (3) the performance degradation that results when a control computation cycle is ocassionally skipped is relatively minor, a fact that is significant when the computer is shared with other systems for which emergency computations may have to be performed. Author N70-43200# Army Engineer Waterways Experiment Station, Vicksburg, Miss. CRITERIA FOR INSPECTION, EVALUATION, CLASSIFICATION, AND REUSE OF USED AIRFIELD LANDING MAT Final Report Philip J. Vedros and Donald N. Brown May 1970 80 p ref (AD-708891; S-70-2) Avail: NTIS CSCL 1/5 The instruction report presents a method for the systematic separation and classification of used panels of M8AI, AM2, XM18, and XM19 landing mats as reusable or unsuitable for future use as light- or medium-duty landing mat. For cases in which the used mat is not suitable for airfield surfacing, suggested secondary uses are presented. Author (TAB) The subject heading is a key to the subject content of the document. The Notation of Content (NOC), rather than the title of the document, is used to provide a more exact description of the subject matter. The report number helps to indicate the type of document cited (e.g., NASA report, translation, NASA contractor report). The accession number is located beneath and to the right of the Notation of Content, eg. N70-20687. Under any one subject heading, the accession numbers are arranged in sequence with the /AA accession numbers appearing first. A [AD-706098] ACCELEROMETERS N70-38390 Error influence of real accelerometer on measuring accuracy of angular velocity ACCIDENT PREVENTION N 70-37791 Aircraft accident prevention and investigation, noting economic factors as deterrent to safety measures implementation A 70-35860 A-300 AIRCRAFT European A-300-B Airbus program, discussing technical and economical aspects A-7 AIRCRAFT ACCURACY A70-36509 N70-41227 N70-37882 Annotated bibliography of shock and vibration publications A 70-42530 Structural and environmental design criteria for acoustical duct-lining materials in turbofan noise suppression |