Accession Number : AD0840732

Title :   DATA SENSING FOR FLIGHT CONTROL SYSTEMS.

Descriptive Note : Technical rept.,

Corporate Author : GRUMMAN AIRCRAFT ENGINEERING CORP BETHPAGE NY

Personal Author(s) : Romeo, A. ; Matero, L. ; Rosenfeld, M.

Report Date : JUN 1968

Pagination or Media Count : 161

Abstract : This study involved a comprehensive investigation of test methods for detection of selected malfunctions in flight control systems (FCS). The ultimate aim is to apply the promising methods on-line and in-flight, to minimize unscheduled and no-defect maintenance, and to increase aircraft availability and mission effectiveness. A survey of present and future FCS was made to determine those failure types and components which cause severe maintenance problems. Malfunction data and pilot symptom reports were accumulated and are tabulated for the A-6A and F-111B FCS. A study was conducted to find secondary effects applicable to hydraulic leak detection. Four effects were selected for experimentation: chemical signatures, acoustic noise, pressure surges and temperature differentials. The results of empirical tests using simulated leaks and actual leaky actuators indicate that only chemical signatures are able to detect excessive external leakages. Tests also indicate it is feasible to detect excessive flow rates using hydrophones to sense changes in acoustic noise profiles. Anticipated problems in application such as environmental masking effects, physical adaption of sensors, extreme environmental changes, and calibration are discussed, and a hardware concept is given. (Author)

Descriptors :   (*FLIGHT CONTROL SYSTEMS, FAILURE), JET FIGHTERS, JET BOMBERS, ATTACK BOMBERS, TEST METHODS, DETECTION, MAINTENANCE, STABILITY, HYDRAULIC ACTUATORS, LEAKAGE(FLUID), FEASIBILITY STUDIES.

Subject Categories : Bombers
      Attack and Fighter Aircraft
      Mfg & Industrial Eng & Control of Product Sys

Distribution Statement : APPROVED FOR PUBLIC RELEASE