Airfoilmod ;
Boeing has addressed, and NTSB reviewed, the mechanism thus far. NTSB claims another incident is likely without a change in the 777-200ER. FAA has yet to speak since its AD modification. The language of the resulting Interim has "exonerated" other types, so far. Wiser, and sounder minds than mine are comfortable with the pace, what else to say??
NO. The tests, as far as can be ascertained, have been carried out using unrepresentative fuel. The mechanism is indicated, but NOT confirmed, and DEFINATELY NOT understood. The mechanism needs to be explained with representative fuel and a real understanding of the mechanism obtained so that new operating and design rules implemented.
The AD has NOT "exonerated" other types whether "so far" or not - have they managed representative tests on ALL other aircraft and engine installations ?
The pace may be as fast as it is possible, but it is nowhere near complete, and if the fuel/ice behaviour is as odd as the AAIB report indicates it may be many years before the whole problem is sorted out.
Is it time to panic - obviously not.
Is it time to relax - no, there is much work still to be done.
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