I discovered this PDF of an Army report the other day. After some testing (1971?) of the UH-1C and AH-1G hydraulic hoses this document (below) was released in January 1972. Very interesting and informative revealing the control hose(s} positioning detail and suggested fix needing attention.
This might be of interest to other Spurs.
Dave Tela, Spur 38 (69-70)
AH-1G Hydraulic Test Report
Update February 13, 2025:
Just found this 1973 document which adds to the Cobra test report but focuses on the other Army helicopter models we were flying in Vietnam. We did as best we knew at the time and these documents confirm we didn’t know enough.
Dave Tela, Spur 38 (69-70)
U.S. ARMY HELICOPTER HYDRAULIC SYSTEM RELIABILITY AND MAINTAINABILITY INVESTIGATION.
September 1973
