UH-1N Category II Climatic Laboratory Tests.
Final rept. 14 Apr-28 Jun 71,
AIR FORCE FLIGHT TEST CENTER EDWARDS AFB CA
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The UH-1N was evaluated at extreme temperatures in the Eglin AFB Climatic Laboratory to identify problems likely to occur in arctic and desert regions of deployment. The UH-1N and its subsystems operated satisfactorily in the laboratory environment from 110 degrees F to -55 degrees F. Major problem areas consisted of severe engine oil leakage at -65 degrees F and 90-degree gearbox oil leakage at 125 degrees F. Except for these leaks and a leak in one stabilizer bar viscous damper, the materials used to seal lubricants and working fluids were adequate particularly in the hydraulic system where no leakage occurred at any test temperatures. The capability for self-contained starts as stated in the UH-1N Detail Specification was considered marginal at or below 0 degrees F and did not exist at -25 degrees F. The bleed air heater did not maintain the 40 degree F mean temperature specified in the UH-1N Detail Specification however, the cabin was comfortable at -55 degrees F outside temperature. In general, the XM-94 weapon system operation was satisfactory at all low temperatures tested, including -65 degrees F. Author