What is the nominal operating tempurature...
For the AW139 main transmission?
The system has an 82c thermostat, so in a sufficiently well-designed system, shouldn't this temp be maintained in normal S&L flight conditions?
The same oil is used in both the engines and the transmission, yet the engines are ''red-lined'' @ 140c and the transmission @ 110c...
.....Reasons?
Someone mentioned the engines having a fuel-cooled oil cooler....this is more of a heat exchanger with the primary purpose of heating the fuel, it does little, or nothing to cool the engine oil. The engine oil temps (in hot climates) run at around 115 to 125c ....and during the two minute cool down after flight can often reach 140c!