bearfoil, Turbine D, and Annex14:
Let me throw a little more grist into the mill that is grinding away on the behavior of the oil circuit:
Recall in the exclusive interview, the SrCheckCapt said that the FO was himself duplicating the time run past the first engine overtemp warning, thru the brief engine fire warning, and into the second overtemp warning. But the FO did not wait beyond 30 seconds from the first overtemp warning. It was stated FO initiated "engine shutdown procedures"* at 30 seconds from the first overtemp warning. (*or words to that effect)
Let's say that since a fire warning had been seen and engine temps continued to rise, the FO made his first shutdown procedure to shut off the fuel, and empty the (a?) fire bottle(s?) into engine #2. Subsequently, one bottle was reported discharged, IIRC.
Let's assume the fuel to the engine was cut off. I don't recall any comment in the report on this matter-- ie, whether the wires latter found cut would have prevented shutoff of fuel to #2, and discharge of the 2d bottle (or even if this was called for, for #2). I do recall the cut wires per report later prevented this relative to #1. Correct me if I am wrong so far.
What happens to the oil temp when the fuel flow stops? The FOHE progressively become less effective in cooling the oil as the now stagnant fuel cools. (I'm assuming fuel shutoff prevents any fuel recirculation through the FOHE, or at least any significant quantity of fresh fuel in any small(?) recirc that may occur from the engine-driven HP fuel pump (again, if this occurs similar to the BA038 system)).
So the oil temp rises. Significantly? Apparently the oil circulation continues, as ever hotter oil continues to arrive at the oil temp gage in the sump. Unfortunately, the beginning of the oil temp rise occurs at a time we do not have in the published data --am I correct in this? Or does the Annex14 failed Excel post have it? [Maybe it just failed on my machine, altho I have Excel if I haven't disabled its use; anyway I have the raw data in a txt file.]
Would this explain a rise in oil temp --due to the FO's emergency shutdown, all stops out, action --before the blowout; and without the need to assume any malfunction or excessive leakage in the oil circuit prior to the IPT blowout? We know that he began this action before the IPT blowout; there was no comment in that interview, that I recall, as to all the actions or how long they took. The FO, however, was quite alert.
I leave this to you all --I'm buried under trying to understand why FAG rates its turbine bearings at -54C to +120C (I understand the -54), while saying that their fatigue life is infinite (a 1983 concept), unless subject to ... overtemperature... among oil contamination and corrosion; while RR sees no problem with oil temps in the 190Cs. Is that the 7-year on wing bearing fatigue temperature limit (a new concept?)?.
Also now going to run down RHP, a British bearing mfr with the capability to make these bearings for RR, and see what they have to say.
Meanwhile, my own ECAM is telling me IE has encountered a problem, and needs to close. Way past 30 sec now... I've discovered that ignored, data will not be lost...
OE