Hi guys
I got a problem I need your thoughts with. Recently one of our birds twice turned back after oil temperature exceeded +-90°C at altitude.
History: The aircraft just completed ISO, and post-dock runs had oil temps getting up to 100°C at ground idle. OAT was in mid 40\'s. Two different oil coolers were fitted, and oil tank was drained and serviced with new oil. After this it was released.
The next mission off base the in-flight problem occurred, and the engine was removed for test cell evaluation.
In the Cell I started by draining all the oil from tank, RGB, ADH, oil cooler