Last Updated：2022/12/24
Boeing and the FAA conducted additional tests and research to further investigate why the rivets failed and what the possible repercussions of such a failure would be, including metallurgical examination of high-time bellcranks, material properties testing on old and new bellcranks, review of bellcrank failure rate data obtained from 767 operators, and examination of maintenance procedures to determine whether changes in procedures and/or intervals were warranted. The Safety Board monitored the FAA's and Boeing's tests and research into the bellcrank shear rivet failures.
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Boeing
and
the
FAA
conducted
additional
tests
and
research
to
further
investigate
why
the
rivets
failed
and
what
the
possible
repercussions
of
such
a
failure
would
be,
including
metallurgical
examination
of
high-time
bellcranks,
material
properties
testing
on
old
and
new
bellcranks,
review
of
bellcrank
failure
rate
data
obtained
from
767
operators,
and
examination
of
maintenance
procedures
to
determine
whether
changes
in
procedures
and/or
intervals
were
warranted.
The
Safety
Board
monitored
the
FAA's
and
Boeing's
tests
and
research
into
the
bellcrank
shear
rivet
failures.
