Refinement of Reject Criteria for UH-1 Sonic Analyzer
Abstract
The purpose of this program was to use additional data to update the original UH-1 aircraft sonic analyzer limits and to determine the advisability of using a common checking engine speed for all models. The method involved a full engineering analysis of the original 1967 data plus an approximately equal amount of data obtained on UH-1 helicopters at Fort Eustis, Virginia, in 1968. Emphasis was placed on selected transmission and tail rotor components, including the primary drive gears. The work consisted of deleting invalid or questionable data by detailed investigation of component inspection records, maintenance records, rpm locking information, playbacks of recorded data, contradictory data, etc., in an effort to assure that only valid representative data was used for limits determination. The need for two test tapes to handle all the various models of the UH-1 helicopter evolved from the analysis. The result is sonic analyzer limits for the UH-1 helicopter which should demand considerable respect as to the condition of the aircraft components. Any readings that exceed these limits in the future should not be passed off lightly, but rather should be seriously considered and investigated thoroughly.
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 01, 1969
- Accession Number
- AD0866977
Entities
People
- William H. Dawson