Accession Number : AD0907738

Title :   Instrument Panel and Avionics Compartment Environmental Survey Production OH-58A Helicopter.

Descriptive Note : Final rept. 14 Sep 70-24 Jun 71,

Corporate Author : ARMY AVIATION SYSTEMS TEST ACTIVITY EDWARDS AFB CA

Personal Author(s) : Lang, Emmett J. ; Claxton, John D. ; Graham, William A., Jr. ; Hepler, Leslie J.

Report Date : SEP 1972

Pagination or Media Count : 101

Abstract : Vibration and temperature measurement tests were conducted on a production OH-58A helicopter to define the instrument and avionics vibration and temperature environment for both weapons-firing and nonweapons-firing flight conditions. Testing was performed by the United States Army Aviation Systems Test Activity, Edwards Air Force Base, California, between 27 May and 24 June 1971. The testing consisted of four flights, totaling 3.0 productive test hours. Vibration data were recorded from seven triaxial accelerometer locations for 29 flight conditions, and narrow-band spectral analyses were performed on the vibration data. The results of the spectral analyses were summarized by use of statistical methods. The primary source of low-frequency vibrations was the main rotor, and the primary source of high-frequency vibrations was gunfire. The characteristic of the instrument and avionics vibration isolation mounts to amplify the vibrations at the main rotor driving frequencies is a short coming. Interior cabin temperatures of 25 C and 6 C above the ambient air temperature were recorded for static and in-flight conditions, respectively. (Author)

Descriptors :   (*HELICOPTERS, ENVIRONMENTAL TESTS), INSTRUMENT PANELS, VIBRATION, TEMPERATURE, MEASUREMENT, ACCELEROMETERS, GYROSCOPES, ULTRAHIGH FREQUENCY, TEST METHODS, COMMUNICATION AND RADIO SYSTEMS, ACCELERATION, HEAT TRANSFER, VIBRATION ISOLATORS.

Subject Categories : Helicopters

Distribution Statement : APPROVED FOR PUBLIC RELEASE