Turbine D, Barit1
thanks for good examples - it really is a case by case operation then
like fine tunung relative natural frequencies so they would not happen together. Does this tuning also include the frequencies induces but burning chambers? These seem to be a source of (possibly the most) significant energy vibrations within the engine case.
Derg, Bearfoil
to me the way chosen by EASA is to FORCE the RR to act faster, even if by now they have realized that the class action would cost them a fortune and lost contracts, is asking for painfully frequent maintenance. This way RR has a chance to improve the solution (especially that the exact reason is known) while still
statistically safe and without loosing the face.
After all changes to internal engine structures are difficult to prepare, make and implement fleet wide. New seals would not be able to absorb the energy emitted during TO/GA
The solution - advice to public to stop flying A380 with RR engines for a while - the question is how public can be sure the replacements program have been completed?
Excellent case of raison d'etat...