8.4 Forward Perspectives
Although this study has produced original and promising results, much work remains in validating and industrializing these methods. This mainly due to the fact that insu.cient validation data exist on record. Signi.cant work on data migration was done as a direct response to this problem, but the resulting data handling infrastructure came in place too late for this study to take signi.cant advantage of it. Still, this infrastructure remains in place for other studies, current and future, within the HUMS domain.
An area in need of further study is the correlation between vibration sig-natures and environmental factors. Although a framework de-correlation of vibration signatures and environmental factors were developed as a part of this study, there is still work to be done to gain an understanding of how and why the environment a.ects the vibration signature of a transmission system. Using the latest generation airborne segment, which entered ser-vice at the end of this study, gains access to the full range of contextual parameters recorded on the aircraft, and makes it possible to correlate vibra-tion signatures against a wide range of environmental factors. By gathering maintenance logs from the operator it will also be possible to investigate any connection between erroneous equipment installation and vibration sig-natures’ sensitivity to environmental factors.
Another research area is validation and industrialization of the progres-sion analysis methods. Although these have been found e.ective on a limited number of test cases, it is still to test the e.ectiveness of these methods on a wider variety of failure modes. Using data from the above discussed data warehouse will facilitate testing against all con.rmed fault cases on record. This is already part of an ongoing study aiming both at including methods from
this
study
as
well
as
testing
new
methods
[46]
to
select
the
set
of
meth-
ods which will be deployed on the next generation HUMS ground station.
Looking at HUMS from a long term perspective raises the question of maintenance credit, like extended TBO as a consequence of reliable condi-tion monitoring. If the e.ectiveness of existing fault detection methods can be documented, it will be possible to change aircraft maintenance proce-dures so that both manual inspection and premature component retirement is reduced. Deploying this at a large scale will have a profound impact on rotorcraft maintenance cost, and life cycle cost in total. A study is already launched aiming at identifying the areas where credit can be obtained, as well as trying to establish a framework for documenting and certifying automated monitoring techniques which can be accepted by the civil regulatory bodies. This will open the door for signi.cant reduction in aircraft maintenance cost and downtime, while at the same time increasing safety.
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