Achim you are right, this would be a huge drop as the surrounding pressure at FL120 is around 18inHg.
No one commented on the oil?
You forgot to put the oil cap on after preflight checks?
Is your wastegate oil pressure actuated?
If so, it probably sprung a leak.
Otherwise, something came off fairly dramatically and cut one of the many oil pipes, but not dramatically since you lost oil very slowly. Cutting one of the pipes which lead up to the rocker covers might do that. It would not show up on the oil pressure indication whose sensor normally comes off one or the other end of the main oil gallery.
The waste gate is manual, by a cable.
Oil pressure and oil temp was normal.
Iced up crankcase vent pipe
How would that cause the MP drop? That is essentially a turbo failure or a leak into the inlet manifold.
We are assuming that the MP drop and the oil overboard are from the same cause. As there is no mention of oil being all over the engine the vent seems likely. The MP drop is likely an unduction leak, I’m assuming that there was a reduction in power/fuel flow – if not its a gauge fault, a leak in the pressure line to the instrument.
On the other hand sometimes the same cause can produce quite different faults, which can be very confusing.
Could the oil leak have blocked the air into the turbo, e.g. clogged an air filter? Or is it not filtered?
Fuel flow was constant.
Ted is right it was a leak in the line to the MP gauge, the line ruptured.
The 2 symptoms were caused by different causes, just an coincidence.
Oil came out of a 45 degree angle connector at the back of the engine where the pressure line to the oil cooler is connected.
2 faults developing on the same flight, how are the odds for this?
2 faults developing on the same flight, how are the odds for this?
For how long did you fly upside-down?
